How do you can repair your china(chip) dead phone with a power supply(DC Supply)

[::.HABIBRANA.::]

How do you can repair your china(chip) dead phone with a power supply(DC Supply).

I share here my some idea .

(1) 1st check dead board via volt miter have short or not? if not shot you can go ahead for next step.

(2) take power supply war and connect phone v+ with power supply v+ and v- with phone v-.

(3) press phone power button and see phone volt reading........its show what ?




(4) if power supply reading nothing i mein reading0.00 change cristal clock ....then check volt . all is ok set must go on ,cause main ic not found power 4 this missing.

(5) if power supply do reading 4-6 its 1st try to format or flash ....if set not open ..then re-hit power ic with hot air and solder pest.all is ok set must go on.

(6) if power supply reading 35-45 reading ....its must be flash ic(Ram) problem ....now re solder flash ic with hot air .

i hope its useful for all. if my post like inspire here.

[B.thirumalaraju]

hi ,
your post is very useful.
i have see lemon mobile switch on but when we attempt to cut call cut button not working
for this i had replaced one diode near power ic it is working.