strange problem G900i restarts only when lcd light gose off - Galaxy S 5 Q&A, Help & Troubleshooting

hello friends
i have gs 5 g900i
it works fine but when the display light gose off after some second it vibrate 2 time and restart if u work with phone no problem and if i put the device lcd light up to 10 minut no problem but when the light gose off the device will reboot
i also hard reset and factory reset but not solved my problem any one can help me

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Sorry for my so bad writing, i try to do the best.
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Edit [ maybe can help, when i'm on bootloader mode i know it's ok because i can use unbrick, and it's recognize the phone and saw SPL number etc... ]
UP
No one?
i've resolved my problem, it's an hardware problem. the left bottom connector is tired.
so thank you all!
I have nearly same problem ... but when my trinity runs any "complex" process it just have scrambled sreen and soft reset. Then black screen with light. And when i want to turn trinity on ... it always have black screen with light but sometimes it just normally turn on. And what is that left bottom connector ? You meant HTC-Ext ( Mini USB ) ?

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