Motherboard resistance associated with the power button - Huawei P Smart Questions & Answers

Good afternoon, see if you can help me.
I have received a Psmart that got wet and with some rusty part, I have managed after cleaning the rust and changing the screen (15e) that everything works except the power button.
The button works well but looking at the motherboard it seemed to me that something was missing and looking for photos I have located that the rust ate the resistance of the power button, and therefore it does not turn on (to turn on, I disconnect the battery and then I connect it to the power supply)
Could someone tell me the value of that resistance?
I attach an image of the area of the plate and a diagram of the resistances, I am missing the one indicated with the arrow that I put as 1.
Thanks!!

Related

Broken power switch - broken off mainboard

Hey all, I'm new to the forums but I can't wait to get my 8125 working. I bought a replacement screen on ebay and a broken 8125.. on receipt all I got was a white screen, then last night I replaced with the new screen and got the cingular logo and the windows mobile "touch anywhere to set up.." message.
Well, touching it did nothing, and the keyboard didn't work, so i opened it up again.
Somehow when I opened it up, the power switch button circuit thing detached from the mainboard (and it looks like the owner before me had actually crazy glued it on!!) .. and now the thing won't power up, won't show a charge light... nothing at all when plugged in or attached to my PC. So I hope that detached power button is the culprit. Upon further inspection I saw that yet another had detached but I can't seem to find where it landed... this one for the little button next to the slider, I don't really know what it does yet.. .
.. so I guess first step is to solder that power button back on and see what happens. Does it sound like a missing power button circuit thing would cause the unit to no longer power on at all (even when soft reset when connected to PC, which used to power it on?)
Pete
i did this. it is hell to solder on. I would say replace the phone
thacmonster said:
i did this. it is hell to solder on. I would say replace the phone
Click to expand...
Click to collapse
Argh.. well, i'll give it a go with the power switch.... do you think it will affect the phone to be missing the comm manager switch off the mainboard too... or will the phone still function without this piece soldered on?
peteclark3 said:
Hey all, I'm new to the forums but I can't wait to get my 8125 working. I bought a replacement screen on ebay and a broken 8125.. on receipt all I got was a white screen, then last night I replaced with the new screen and got the cingular logo and the windows mobile "touch anywhere to set up.." message.
Well, touching it did nothing, and the keyboard didn't work, so i opened it up again.
Somehow when I opened it up, the power switch button circuit thing detached from the mainboard (and it looks like the owner before me had actually crazy glued it on!!) .. and now the thing won't power up, won't show a charge light... nothing at all when plugged in or attached to my PC. So I hope that detached power button is the culprit. Upon further inspection I saw that yet another had detached but I can't seem to find where it landed... this one for the little button next to the slider, I don't really know what it does yet.. .
.. so I guess first step is to solder that power button back on and see what happens. Does it sound like a missing power button circuit thing would cause the unit to no longer power on at all (even when soft reset when connected to PC, which used to power it on?)
Pete
Click to expand...
Click to collapse
Yes, the power on/off button being broken is the reason why you had a white screen, and only getting the splash screen after replacing the touch screen. If you're a good assembly man, I'd suggest try to solder the button back ln place or replace the device. As for the button by the volume slider, that's the comm manager button. If you can ever get to the homescreen, the comm manager icon to activate the comm manager (bluetooth, WiFi, etc. is in the system tray at the bottom of the homescreen.
It sounds to me the new screen was replaced improperly, accounting for nothing happening when you tap it.Try re-installing the replacement screen.
8125
2.25.11.1

[Q] plz help me

i need nexus one schematic or i need power on switch ways coz it broken
i only want track + for power switch
any pic plz
& thanks for all
Connect to USB charger, remove battery, insert battery.
Search eBay for a flex cable, one of them includes the power switch.
Connect USB charger and wait for charging light to appear, while still inserted remove the battery quickly and watch for the charging led to disappear. Once it does quickly insert the battery again before the light returns, the phone should vibrate and start up.
As for tear down guides:
iFixit - Nexus One
Cnn.cn Teardown
As rusty said you can buy a new flex from eBay and replace it yourself, this will fix the power button. However before doing so, disassemble your N1 as far as the logic board removal (Part that holds power button) and double check that the broken component isn't simply the plastic button but rather a problem with the logic board/flex. The plastic power button should have a small piece of plastic which actually presses on the power button on the flex, if it is broken and the flex still functions correctly then you should be able to buy and replace the plastic button only for much cheaper.
If you've any questions, just ask.

[Q] Power button issue!

usualy i am good with physical problems like this but i am now forced to make my own thread because i have no idea why my device wont power on.
after opening my blackstone/touch hd to tighten my screws, my power button has stopped working.
(fyi, a screw came loose a while ago near my sim card after dropping my devive so i thought id tighten all my screws while i had my screwdrivers out fixing my cousins phone)
however, without having the plastic power button attatched to the device, i am able to press the actual button with my stylus and make contact with the main button on the motherboard, the device will now power on.
(eliminating that the actual button to power on is broken)
but, when i attatch the plastic button and press it to power on the device, it doesnt make contact with the actual button inside on the motherboard.
(not making contact with the button on the motherboard)
i have examined the plastic button, all is intact and i am assembling it to the device correctly.
i have examined the actual power button on the motherboard and that is working perfect.
what the hell is going on?
thanks
Rn
ps, i need my power button
cba putting my stylus in and taking it out whenever my backlight goes off
* if you want a picture of my plastic button, i will dissasemble my device and take a picture.
Pictures ?

broken volume button after display replacement

I have successfully replaced the screen on the HTC HD2 Leo, but after assembling the phone the volume button is not working. I am not sure if there can be something missing as I cannot feel the 'click' when it's pushed. (not sure if it was there before though)
As far as I remember the volume button consist of two parts: the printed circuit and the plastic button. Or is there maybe something that needs to be connected that I have missed?
Thanks for any hints
fredbred said:
I have successfully replaced the screen on the HTC HD2 Leo, but after assembling the phone the volume button is not working. I am not sure if there can be something missing as I cannot feel the 'click' when it's pushed. (not sure if it was there before though)
As far as I remember the volume button consist of two parts: the printed circuit and the plastic button. Or is there maybe something that needs to be connected that I have missed?
Thanks for any hints
Click to expand...
Click to collapse
dismantle it again, it can be the plastic button its self, it acts like a spring under its own tension, when I re built mine the first time the lower button had stopped worked well, and it was simple because I hadn't put it back right, it was, and it looked right, but it wasn't quite right
I would a agree with dazza9075. Sometimes when putting the phone back together it may look right but sometimes its not. If i remember correctly there is a little spot it fits right into but you need to make sure it goes in in just the right way,
both on the top and the bottom. There is a complete how to guide to replace the lcd screen on the HD2. If i find it I will post the link. It may clear up just how you need to place the vol button back in place. Worse case you can always find a
cheap volume button for only a few dollars on ebay to see if maybe you broke this one when trying to replace the screen.
Hi, I did not manage to fix the button, but managed to get by without it.Till now. I was looking in google for a solution and found my own tread from ages ago...
Now, I would need to put the button together again. I looked into it and I guess I am missing a piece that the plastic button is supposed to be pushing. Before I order something, can anyone please confirm and possibly post a picture of what the button it should look like under the plastic part. Also if you know what the part I need is called, please let know. Please see below how my button "circuit" looks like.
Many thanks for any help
This is what you should have bellow the button
Vesavoj said:
This is what you should have bellow the button
Click to expand...
Click to collapse
Thanks for your response. I could not find the buttons separately and have therefore ordered the button ribbon for the 5 hw keys for under $3, which hopefully will be possible to dissemble and transfer. I would rather not buy the whole flex cable, where's the button is attached to, as this is quite expensive $20+.
I let you know if I was lucky. If you know where I can buy only the small pieces I am missing, please let me know.
A pic of what I ordered is attached fyi
i can confirm that you can use buttons from that tape, I've had the same situation, just pick up the circle button and add it to volume tape.
Mine was damaged during assembly, you have to be very carefoul
You can actually do lcd & digi removal & refit without need to remove flex ribbon completely thus keep the volume button & cables running to mainboard all in place and those small button caps are safe still wrapped in original tape & it all goes back together factory style ...

Samsung s8 volume key and bixby key not working

Hi Folks
The volume up/down and bixby keys are not working on my S8. I have confirmed this is not a physical button related issue as i swapped out the motherboard with another and the buttons were working fine. So the problem seems to be a motherboard issue.
on the motherboard i checked for connectivity between the touch point (spring like stuff on the motherboard that pushes against the button contact points on the frame and connectivity is there. Not sure what to check next ?
Any ideas on troubleshooting this problem
Since you have it open, follow the traces from the contact points to wherever they lead. Check for any irregularities there.
Well i tried. Unfortunately there is no service manual available to even identify the small components. What i figured out so far is that there are four connectors on the board. the following combination shorts when the key is pressed
1-4 - Volume up
1-3 - Volume down
1-2 - Bixby
I can trace 2,3,4 to the next point but cant figure out where it goes after that. The pin 1 i assume will have to be at a higher voltage, again cant figure out where it comes from.
EDIT: Of did some more research and testing and found the pins 3 and 4 used for volume up and down are at 1.8V and the pin 2 for BIXBY is at 3.2V. The pin 1 is at ground. In my case pin 1 was not connecting to ground.
Some more testing later i realized that the pin connects to ground on the other side of the board same position. Did some soldering there and connectivity to ground was re-established and the buttons started working again.
I assume that the connectivity broke when i heated the back and front of the phone when replacing the broken display. This would have caused the existing solder to melt and disconnect. Surprising thing is i dont remember heating it to such a temperature that should cause the solder to melt.
Anyways problem solved and some lessons learnt
hello I have exactly the same problem that I have yet replaced the tablecloth volume is button but it does not work, can you give me more explanation and detail on the connection of the earth thank you very much for your help
eric

Categories

Resources