Okey guys,
I have a very serious problem with my Samsung S4 I337 AT&T. I cracked the screen, so I purchased new housing with the LCD altogether from a Sprint phone.
I know, I know it's Sprint, but I thought they would be using the same housing, however there are small differences on how the motherboard sits on the housing. I took the time and used a dentist high speed grinder tool to grind out the excess metal from the housing, so the motherboard can be placed well. I covered with tape the motherboard where it touches the housing metal parts with tape, so contact can be avoided, otherwise it seems to touch the volume down button and make it pressed all the time, thus unable to boot normally.
After I placed everything back inside and close the phone, signal is nowhere to be found. If it finds a signal it's very weak and after few minutes gets lost again. On very rare occasions the signal gets to where it should be, but very quickly gets lost.
So to me it appears that it's an antenna issue of some sort or I'm missing out something, so I'm asking for your help to figure it out.
I'm using the home button from the Sprint phone, I tried connecting the AT&T home button board, since they have small differences (seems like Sprint uses 2 antenna cables), but it doesn't solve the signal issue.
So my question is, am I missing something or doing something wrong or is the Sprint housing causing the signal problems?
It would become super expensive if I have to buy a new AT&T housing with LCD and replace it, so before I do that I want to make sure what causes the problem.
I can attach photos and show what I have done and show differences of the housing panels of Sprint and AT&T, if it is not understandable by reading.
Thanks for your help!
I think you'd need AT&T stuff because another thread(it should be in this forum) had the same issues.
http://forum.xda-developers.com/showthread.php?t=2391568
Sent from my SAMSUNG-SGH-I337 using xda app-developers app
You need the AT&T housing. Always use parts made specifically for your model number.
Sent from my SPH-D710 using xda premium
Ok, thanks guys!
Already ordered the AT&T housing for it, however what do you think causes this problem. There is literally nothing much on the housing except for some antenna part on the rear end, I tried using the rear housing panel and still nothing changes.
skabg said:
Ok, thanks guys!
Already ordered the AT&T housing for it, however what do you think causes this problem. There is literally nothing much on the housing except for some antenna part on the rear end, I tried using the rear housing panel and still nothing changes.
Click to expand...
Click to collapse
The antennas are different. The antenna for AT&T is made for GSM and is a certain length and pattern. The antenna for sprint is made for CDMA and would logically be a different length and pattern. Antennas have to be exact/precise for what they are made for.
Sent from my SPH-D710 using xda premium
graydiggy said:
The antennas are different. The antenna for AT&T is made for GSM and is a certain length and pattern. The antenna for sprint is made for CDMA and would logically be a different length and pattern. Antennas have to be exact/precise for what they are made for.
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
Ok, I understand that, but wouldn't it be the same if I use the front housing from the Sprint with the rear panel where the antenna actually is from AT&T. Even in that case, I can't seem to make it work. Is there something I am missing? The antenna cable from the usb board to the motherboard is all the same and changing them doesn't help either. There must be something else hidden I don't see or understand.
skabg said:
Ok, I understand that, but wouldn't it be the same if I use the front housing from the Sprint with the rear panel where the antenna actually is from AT&T. Even in that case, I can't seem to make it work. Is there something I am missing? The antenna cable from the usb board to the motherboard is all the same and changing them doesn't help either. There must be something else hidden I don't see or understand.
Click to expand...
Click to collapse
There is likely contacts on the front bezel/panel that touch contacts on the motherboard. Similar to the GSM nexus 7. You have to use parts specific to the model number.
Sent from my SPH-D710 using xda premium
graydiggy said:
There is likely contacts on the front bezel/panel that touch contacts on the motherboard. Similar to the GSM nexus 7. You have to use parts specific to the model number.
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
Thanks for the help, I already ordered the AT&T panel, I'll update when it arrives.
silver waruch
skabg said:
Thanks for the help, I already ordered the AT&T panel, I'll update when it arrives.
Click to expand...
Click to collapse
Well, this is now a bummer. New AT&T housing arrived. I installed the motherboard and original antenna cable, all original part and still signal is nowhere to be found. I have re-checked everything twice and nothing.
Any suggestions here guys?
Check any metal contacts that would close a circuit from the motherboard to the casing... I have a suspicion that one may have broken off.
Sent from my SGH-I337 using xda premium
graydiggy said:
Check any metal contacts that would close a circuit from the motherboard to the casing... I have a suspicion that one may have broken off.
Sent from my SGH-I337 using xda premium
Click to expand...
Click to collapse
Okey, so you were right. One of the metal contact on the motherboard side was broken, so I had that re-soldered back into place. Signal did improve after that, but still very low and non consistent. It would vary between 0 and 1 bar at home, where I usually get 3-4 bars. Near cell towers goes up to 4 bars and LTE, but that's just about it. Signal strenght is -105dBm 2-5asu, which is very low.
What else can I be doing wrong or could have gone wrong in the first place?
Is there a place I can buy an external antenna and connect it to the L1 port and just use that hidden between the battery and the rear plate? Anyone has any experience with those?
Your signal is shoddy because of the solder. I highly suggest not modifying the antenna as that could make things worse. I would replace the entire board that that piece sits on. Or grab the connector off of a broken/ phone and replace that.
Sent from my SGH-I337 using xda premium
Well, in this case I have to replace the whole motherboard, as this connector sits on it. I have the same connector and can possibly un-solder the old one from the board and put the new one.
Does really the little bit of solder can mess so much with the signal quality?
Yep. The connector is copper. Solder is composed of nickel and lead normally. Having 2 or more different metals messes with the conductivity.
Sent from my SGH-I337 using xda premium
You might be right about that, but that small metal piece acting as a connector isn't made of copper for sure, it looks like it, but it is attracted by magnet, that's how I soldered it back into place. Based on my knowledge copper alone isn't attracted by magnets, so it has to be some sort of a mix of metals. Isn't the connector soldered to the motherboard anyways? It just bugs me how big of a difference this would make.
It is copper coated. They solder used is very thin on the motherboard. It has a very little affect to the signal. When you add more, it messes things up.
Sent from my SGH-I337 using xda premium
graydiggy said:
It is copper coated. They solder used is very thin on the motherboard. It has a very little affect to the signal. When you add more, it messes things up.
Sent from my SGH-I337 using xda premium
Click to expand...
Click to collapse
Interesting, any suggestions of how to remove the broken piece from the board and re-solder the new one? Seems like solder gun will be out of the equation.
skabg said:
Interesting, any suggestions of how to remove the broken piece from the board and re-solder the new one? Seems like solder gun will be out of the equation.
Click to expand...
Click to collapse
15 to 25W max soldering iron. A thin layer of solder on the new part. Set it on the pad, heat it on the top of the contact surface of the new part till it joins. You should be good from there. Be careful of surrounding parts.
Sent from my SGH-I337 using xda premium
graydiggy said:
15 to 25W max soldering iron. A thin layer of solder on the new part. Set it on the pad, heat it on the top of the contact surface of the new part till it joins. You should be good from there. Be careful of surrounding parts.
Sent from my SGH-I337 using xda premium
Click to expand...
Click to collapse
You guys are amazing. I would have broke down and just replaced the phone.
Sent from my SAMSUNG-SGH-I337 using xda premium
I've been doing small electronics repair for almost 11 years. Its easy for me. Just gotta be patient and careful.
Sent from my SGH-I337 using xda premium
Related
Hi everybody
Just a question i removed this stickers from my atrix and now i can see perhaps aluminum do you think it's a matter???
tonton_fred said:
Hi everybody
Just a question i removed this stickers from my atrix and now i can see perhaps aluminum do you think it's a matter???
Click to expand...
Click to collapse
Why would you do that?
It's not like anybody is going to look inside the battery cover anyway.
the sticker make me crazy
i already did it i hope it s not a problem i don't think so but i want to know if another user did it as well...
Because i never expected something like that under.
Like i said a stupid question, but i m wondering about my phone.
No motorola warranty in switzerland...
Aluminum? In terms of a sticker or built into the plastic? If it is the former it might just be a security thing if the stores implement it to keep people from walking out on a busy day or something.
Don't think about it though, it won't affect anything.
Sent from my Nexus One using XDA Premium App
I took my sticker off and like you I wasn't sure if I should. I was wondering if it make it a little cooler (for some reason). I don't think it hurts anything but now that I think of it, maybe the extra tiny amount of space gone is contributing to my creeky back cover.
Sent from my Olympus using XDA App
Maybe try putting some electrical tape on it? It will look fugly but like I said, who is going to see it under the battery cover?
i took some pictures of what i just did
just pick and peel at it and it will come off
hope this helps someone
brian2220 said:
i took some pictures of what i just did
just pick and peel at it and it will come off
hope this helps someone
Click to expand...
Click to collapse
Haha, it looks like a heat sink to me. I bet you did the wrong move because the battery does get hot and the sticker should be able to dissipate the heat. It's nothing to do with antenna reception I think because there is no metal connector directly connecting to the battery cover.
There is a contact id get its part of the antenna array.
Sent from my MB860 using XDA Premium App
I don't know if it s really efficient for the cooling...
But i think it's perhaps something like that.
To be more specific i don't want this aluminum or whatever it is stick on my battery the only way to find out is trying
Thanks for the reply
squarejp said:
Haha, it looks like a heat sink to me. I bet you did the wrong move because the battery does get hot and the sticker should be able to dissipate the heat. It's nothing to do with antenna reception I think because there is no metal connector directly connecting to the battery cover.
Click to expand...
Click to collapse
Probably an interference shield.
ah why not i don't think about this posibility
I just got a new (my second) hd2 and sombody bumped into me at a restaraunt and....yeah i think you all know where this is headed. Anyways i ordered a new digitizer today and the necessary tools to dis/reassemble it. Has anyone attempted this succesfully. I know i purchased the non solder version as my hd2 is for tmous. Im worried its over my head but i dont want to chicken out and have to pay some a$$ an outrageous amount of money to do it for me. Any help will be appreciated thanks! ps ive watched every youtube video i can find and looked at a ton of pics, so im not totally in the dark lol, just wanted some real world advice.
Sent from my SGH-T959V using Tapatalk
Anyone?
Sent from my SGH-T959V using Tapatalk
Put simply it is not the easiest.
most people will break the LCD either from prying the back cover or during LCD Digi separation.
personally I go for LCD Digi combo (300 type) pre assembled & drop it in. About 25bucks more expensive but no issues with wrong Digi casing depth, button alignment dust ect.
the 3M tape method is far from the best really as bonding surface width is not wide enough.
Badly bonded screen allow dust entry & are more easily broken as good & full perimeter bonding increases strength & absorbs impacts more evenly.
I have done Digi remounting with a tack bonder uhu40 applied finely via syringe & allowed to cure slightly prior to assembly, gives a dust proof finish & allows original Digi to cover hight but takes time to do well & get digi alignment correct.
The top tip is simply be gentle, volume button is easily damaged & the screen connector on the mainboard is easily damaged.
It is possible to do screen without fully lifting the flex board & stripping all wires as seen in most vids.
I recommend peeling build label then peeling flex board, build label comes up quite easily then you can see exactly what is happening to flexboard & thus prevent possible damage.
If you buy full LCD/Digi assembly & take care the result & finish can be perfect or better if upgrading from a 295 assembly.
If going just Digi end result really depends on how well you bond Digi to LCD.
Bench testing new assembly with main & flexboard running on battery & button pad held in place with a little tape is a good idea before final build.
Also check all antenna spring legs are correctly positioned suitable for good contact with mating pads inside rear cover, failure results in low or no wifi &/or radio signal.
If you do have some natural skill with tools & engineering practices then it is not too troublesome.
Most people who have faults are all down to rough dismantling ...
Also worth mentioning the myth of the end key having the screen cable run under it; it does not, LCD finishes 2mm above end key & no LCD or Digi cables run under the end key or any of the buttons/button flexboard.
The screen flex does curl around edge of LCD above end key but is taped & not easily rubbed by endkey.
Most endkey related non responding digis to me is actually button flexboard issue.
I worked on many dumbphones between 2003-2008. After a while it became routine, even delicate phones like the Moto RAZR V6 MAXX.
The HD2 is extremely difficult, not only to replace the digitizer, but to make sure you position it right and don't leave it in such a way that dust gets under the screen. Getting it back together is not simple either since it has a number of little wires that have to be placed just so. I ended up paying some a$$ to do it for me, because it was too much.
With lots of concentration and dedication, it can be done though!
Ok thanks for the halp cancelled my order for the digi alone. And one more thing... Will a lcd/digi assembly with the "295" work on the hd2 for tmous? ive googled it and came up with mixed results. it seems the "295" is the debranded one for euro hd2s and the 300 is for US phones. I understand that the digitizers are different in that the euro one has a soldiered connectin to the lcd ribbon and the us one has a clip. BUT, will this affect anything as far as the connection to the mobo? the 295 one is cheaper but is it compatable? Much thanks!
Sent from my SGH-T959V using Tapatalk
295 & 300 types can be swapped & 295 can be put in TMOUS although I would not go that route as the 300 type is a far better quality type of Digi & the diifference in price if any is minimal.
Found a 300 lcd/digi combo for 56.99 on ebay
Sent from my SGH-T959V using Tapatalk
leo321 said:
Found a 300 lcd/digi combo for 56.99 on ebay
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Click to expand...
Click to collapse
It was actually cheaper than the 295s lol guess i overlooked it. Im liking this galaxy s2 right now B)
Sent from my SGH-T989 using Tapatalk
Sorry to bring up my dead thread, but I was wondering if its possible to just remove the LCD+digi and pop in another one without seperating the mainbord and rigid flexboard from the metal frame? I saw a YouTube video with this type of disassembly process (removing the LCD first) but is the space between the connector and the hole in the frame large enough for it to be connected? If not I might just make the hole big enough . I don't want to have to take it completely apart... I suppose its laziness thanks!
Sent from my SGH-T959V using Tapatalk
Not really, you need to swing the board out to release catch for ribbon cable.
To be honest removing the flexboard is quite easy if done with care & all cables running down by volume button do not need complete removal.
You can do it by not copletely removing flexboard but to me it is more awkward & could strain parts if not very carefull.
Mister B said:
Not really, you need to swing the board out to release catch for ribbon cable.
To be honest removing the flexboard is quite easy if done with care & all cables running down by volume button do not need complete removal.
You can do it by not copletely removing flexboard but to me it is more awkward & could strain parts if not very carefull.
Click to expand...
Click to collapse
What im saying is can I just swing the screen to the side and unhook it? Then replace it without removing anything on the other side of the frame.
Sent from my SGH-T959V using Tapatalk
I think no as will not be able to remove caption tape & ribbon catch without swinging mainboard but have a look first.
This might help you
http://forum.xda-developers.com/showpost.php?p=16718344&postcount=16
It worked for me when replacing my digitizer/screen though it was alittle pain to reconnect the ribbon to the motherboard its well worth it. Just have patience's
leo321 said:
What im saying is can I just swing the screen to the side and unhook it? Then replace it without removing anything on the other side of the frame.
Sent from my SGH-T959V using Tapatalk
Click to expand...
Click to collapse
Mister B is correct
Sent from my LG-P999 using xda premium
kompheak said:
Mister B is correct
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
+1 on this.
10 char
Hows it going guys!
After many days of using this awesome forum, I decided to finally join!
So to start things off, I will be asking you guys a question....
Anyone know whats the little gold plated thing on the back, behind the batt. cover of the phone, wondering if it has anything to do with the battery, or some sort of sensor???
There is also a white area on the back of the actual battery cover of the MT4G which I think is the contact point for the gold plated thingy!?
Thanks guys...
Regards,
blackeye
I think it has something to do with grounding, maybe for the screen. I could be way off.
Sent from my Glacier using XDA
estallings15 said:
I think it has something to do with grounding, maybe for the screen. I could be way off.
Sent from my Glacier using XDA
Click to expand...
Click to collapse
sounds possible!
the reason I ask is because I decided to run my glacier without the battery cover using a case then i noticed my battery started acting funny, it didnt hold its charger very well and didnt charge fully......wondering if the 2 are related somehow!?
"Little gold plated thing" = contact point.
If it's behind battery cover, and battery cover has a matching "window" of bare metal for this contact - look for more contacts that touch the battery cover.
If you only find one - it means the battery cover is used as one of the antennas for this phone (cellular / WiFi / BT).
If you find several - it might be used as grounded shield.
Jack_R1 said:
"Little gold plated thing" = contact point.
If it's behind battery cover, and battery cover has a matching "window" of bare metal for this contact - look for more contacts that touch the battery cover.
If you only find one - it means the battery cover is used as one of the antennas for this phone (cellular / WiFi / BT).
If you find several - it might be used as grounded shield.
Click to expand...
Click to collapse
thanks man appreciate it!
So the glacier theoretically should get great reception then...I'm guessing!
Regards,
Blackeye
Sent from my HTC Glacier using XDA
Mine don't have them..I have 3, Me my wife & a spare..
Sent from my HTC Glacier using xda premium
The little gold contact on the battery cover has been discussed here before, probably in a thread that is buried. The conclusion: the ground contact point for the screen. Pic attached to show what the OP is talking about.
Sent from my HTC Glacier using XDA
I couldn't find such thread in 10 min of googling, so I did what was probably done back then - verified the location of main antenna (which is on the plastic cover with camera glass), checked WiFi and GPS reception. None of those changed. It leaves either BT (which I can't check) or, indeed, grounding.
Jack_R1 said:
I couldn't find such thread in 10 min of googling, so I did what was probably done back then - verified the location of main antenna (which is on the plastic cover with camera glass), checked WiFi and GPS reception. None of those changed. It leaves either BT (which I can't check) or, indeed, grounding.
Click to expand...
Click to collapse
Seams like it would between the two!!
Sent from my HTC Glacier using XDA
Just a thought but I could have to do with the sensor for temperature.
Temperature sensor can't be embedded in the back cover, and the point is for electrical, not thermal contact.
Upon further review, only 1 of the 3 mt4g's that I have has the gold plate at all. It's possible it could be nothing significant.
Sent from my HTC Glacier using xda premium
The thread I referred to earlier is here: http://forum.xda-developers.com/showthread.php?t=1205155.
In the first post, in the update area at the bottom of the post, it points to a thread in the sensation forum. The pics in that sensation thread show that they have a silver colored plate on their cover almost identical to the mytouch4G's gold plate. The plate is conductive paint that creates contact between the metal of the back cover and a gold pin between the sim and sd cards on our phones. It is located directly above the main board of the phone, near the bottom of the device. The pin can be bent or fatigued to no longer create a good, solid contact with the plate.
The main solution proposed in both threads is to gently lift the pin with a pick to raise its height and create better contact with the plate and is done to have better touch screen response.
dclaw_fantum said:
The thread I referred to earlier is here: http://forum.xda-developers.com/showthread.php?t=1205155.
In the first post, in the update area at the bottom of the post, it points to a thread in the sensation forum. The pics in that sensation thread show that they have a silver colored plate on their cover almost identical to the mytouch4G's gold plate. The plate is conductive paint that creates contact between the metal of the back cover and a gold pin between the sim and sd cards on our phones. It is located directly above the main board of the phone, near the bottom of the device. The pin can be bent or fatigued to no longer create a good, solid contact with the plate.
The main solution proposed in both threads is to gently lift the pin with a pick to raise its height and create better contact with the plate and is done to have better touch screen response.
Click to expand...
Click to collapse
That is interesting!
So if true then the concept would be useless if we have cases on our phones...since our hands won't make contact with the back cover anymore....right!???
Sent from my HTC Glacier using XDA
blackeye09 said:
That is interesting!
So if true then the concept would be useless if we have cases on our phones...since our hands won't make contact with the back cover anymore....right!???
Sent from my HTC Glacier using XDA
Click to expand...
Click to collapse
No, it isn't using your hands to complete the circuit. The phone chassis is mostly metal, but the main board is surrounded by plastic. It looks like they found it more cost effective to ground to the cover than run a wire to a part of the chassis. Looking at the sensation cover, this makes sense. The sensation cover is metal and plastic and they put a contact point on the metal of it too. If it is anything like what I deal with at my work, then they are just trying to provide the phone with a system wide consistent ground. Without grounding the back cover, it could induce or conduct a static charge and possibly shock or create interfere to the main board. When the ground has bad contact, we notice a lag in screen responsiveness, but other things may be happening that we don't notice.
Someone mentioned that the antennas are located near the camera, which is true for at least the WiFi antenna. You will see a drop in signal if you hold the phone near the camera. They also mentioned that the top area of the phone has metal readily available. I would suspect that the other antennas are there too.
dclaw_fantum said:
No, it isn't using your hands to complete the circuit. The phone chassis is mostly metal, but the main board is surrounded by plastic. It looks like they found it more cost effective to ground to the cover than run a wire to a part of the chassis. Looking at the sensation cover, this makes sense. The sensation cover is metal and plastic and they put a contact point on the metal of it too. If it is anything like what I deal with at my work, then they are just trying to provide the phone with a system wide consistent ground. Without grounding the back cover, it could induce or conduct a static charge and possibly shock or create interfere to the main board. When the ground has bad contact, we notice a lag in screen responsiveness, but other things may be happening that we don't notice.
Someone mentioned that the antennas are located near the camera, which is true for at least the WiFi antenna. You will see a drop in signal if you hold the phone near the camera. They also mentioned that the top area of the phone has metal readily available. I would suspect that the other antennas are there too.
Click to expand...
Click to collapse
good to know!
I might remove the case then, don't want to shock the main board!!
Sent from my HTC Glacier using XDA
blackeye09 said:
good to know!
I might remove the case then, don't want to shock the main board!!
Sent from my HTC Glacier using XDA
Click to expand...
Click to collapse
Having a case in your phone will not be an issue. The grounding happens using a self-contained circuit. The back plate may just be used as part of that circuit. Additional static from being in your pocket will be grounded with or without a case on the phone.
Sent from my HTC Glacier using XDA
Hi All,
I 'll start by cutting the story short. I was having connection dropping problems.I took off the back cover and mistakenly broke the wifi spring connectors on my Nexus 7. (Yeah I know past now...need to find a solution)
I called up Asus and it will cost "£60+ whatever it cost to repair" which is pointless really as the device was bought for about £200.
I'd like to fix it myself but I was wondering if anyone could advice on the best way to proceed
Do I solder wires to b/w the board and the antenna ?
Is there a way I could glue back the spring connectors without its conductivitiy? etc
Cheers for your help in adv
Chib
I still get some reception, 1 bar at most and it depends on where I am at home.
Chibuski said:
Hi All,
I 'll start by cutting the story short. I was having connection dropping problems.I took off the back cover and mistakenly broke the wifi spring connectors on my Nexus 7. (Yeah I know past now...need to find a solution)
Click to expand...
Click to collapse
I just bought a brand new Nexus 7 and it had this problem out of the box - busted Wifi antenna contact springs from the factory!
Therefore it's possible you didn't break it. I'll be taking mine back as a DOA, but if yours needs repairing by yourself you could just put some globs of solder on the pads, building them up in height until they contact the rear case reliably.
solder it maybe it will fix it i dont think you'll lose anything if all things fail then bring it to asus
Sent from my Nexus 7 using XDA Premium HD app
Solder makes poor physical connection
I had my Nexus 7 for a month. The wifi antenna contact broke at that time. Same symptoms - few wifi bars, poor reception at any distance beyond 10 feet. Sent it back to ASUS - they are curently repairing it under warranty. I would not suggest building up solder to make a physical connection - solder-to-solder is a poor connection. There parts are so tiny and the space is so tight, I don't know how to compensate for this broken connection. I'm thinking it's a design defect.
Little blobs of solder works great for me.
Sent from my Nexus 7 using XDA Premium HD app
Curious if you have any pics of the solder job. I have same issue with one of the GPS antenna, little spring thing is broken
Same issue but I bought a sealed unit off Kijiji. Do I still have warranty? It's a 32 GIG unit with a serial CBXXX
Same issue here along with a cracked screen! I wonder if it is possible to repair using a wire similar to the spring pin by solder
I recently broke the screen (glass and lcd).
I bought a new, replaced, and now when I switch on a cell phone, the screen does not work (just black screen), but touches react.
Is dead or has a chance? some advice? anything? I'm desperate.
Try taking phone apart again and make sure the components are attached right and clipped down securely. I'd advice to test it before putting it back together
Sent from my Nexus 4 using Tapatalk
xSharpi said:
Try taking phone apart again and make sure the components are attached right and clipped down securely. I'd advice to test it before putting it back together
Sent from my Nexus 4 using Tapatalk
Click to expand...
Click to collapse
Agreed. Sounds like a loose connector to me. I would recommend reseating the connectors (you should feel them gently lock into place). If that still doesn't work, I'd consider evaluating whether the connector is actually damaged or if your screen is DOA.