3gs no power no charge - GSM-Forum

coupe-r · 07-24-2012, 04:01

Water damaged logic board.
Cleaned with Acetone and assembled into a working iphone case.

No power, no charge.

Please give me a step by step test guide.

I can see pictures and half steps mixed up all over the site. But no complete list of no power no charge diagnosing steps.

So where should I check first?
Remember USB cable, doc connector, battery and screen etc are PERFECT.

coupe-r · 07-24-2012, 10:46

I have tried checking voltage from the L9 coil two points.
point closest to the bottom reads around 5.6v
point at the top reads 3.66v

When i remove the charger they both read 0v

there is short/beep between main green fuse and the charging circuit.

What else should I check with the multimeter to narrow things down a bit. I was told this logic board had water damage and DID power on with no backlight. When I received it, the board did not power on

coupe-r · 07-26-2012, 04:41

5.6v from closest to side of phone I meant,
and 3.66 from furtherest away from side of phone.

still can't get it to power up.
Getting another phone that has everything working apart from no signal, so i'll put the board in a phone with a charged battery and see if it powers up

red_arrow · 09-10-2012, 13:21

Same issue. Can anyone please help?

kostelectronics · 09-10-2012, 13:41

first, check the battery voltage at the golden test-point near the vibrator. If this is ok, check this out!

www.technicalnet.ch/temp/3GS_PMIC_Diagnose.jpg

pls give feedback!

07-24-2012, 04:01	#1 (permalink)
coupe-r Junior Member Join Date: Jul 2012 Location: New Zealand Posts: 3 Member: 1788783 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	3gs no power no charge Water damaged logic board. Cleaned with Acetone and assembled into a working iphone case. No power, no charge. Please give me a step by step test guide. I can see pictures and half steps mixed up all over the site. But no complete list of no power no charge diagnosing steps. So where should I check first? Remember USB cable, doc connector, battery and screen etc are PERFECT.

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07-24-2012, 10:46	#2 (permalink)
coupe-r Junior Member Join Date: Jul 2012 Location: New Zealand Posts: 3 Member: 1788783 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	I have tried checking voltage from the L9 coil two points. point closest to the bottom reads around 5.6v point at the top reads 3.66v When i remove the charger they both read 0v there is short/beep between main green fuse and the charging circuit. What else should I check with the multimeter to narrow things down a bit. I was told this logic board had water damage and DID power on with no backlight. When I received it, the board did not power on

07-26-2012, 04:41	#3 (permalink)
coupe-r Junior Member Join Date: Jul 2012 Location: New Zealand Posts: 3 Member: 1788783 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	5.6v from closest to side of phone I meant, and 3.66 from furtherest away from side of phone. still can't get it to power up. Getting another phone that has everything working apart from no signal, so i'll put the board in a phone with a charged battery and see if it powers up

09-10-2012, 13:21	#4 (permalink)
red_arrow Junior Member Join Date: May 2012 Posts: 7 Member: 1763101 Status: Offline Thanks: 2 Thanked 0 Times in 0 Posts	Same issue. Can anyone please help?

09-10-2012, 13:41	#5 (permalink)
kostelectronics No Life Poster Join Date: Apr 2009 Location: Wikon, Switzerland Posts: 703 Member: 1012778 Status: Offline Thanks: 61 Thanked 178 Times in 135 Posts	first, check the battery voltage at the golden test-point near the vibrator. If this is ok, check this out! www.technicalnet.ch/temp/3GS_PMIC_Diagnose.jpg pls give feedback!