iPad Air 2 - no image. - GSM-Forum

reddemonic · 10-27-2017, 23:12

hi,

i've a iPad air 2 here, no image, no backlight. liquid got on the LCD fpc and filters. I've replaced LCD FPC connector, filters, U4600, and diodes. I've tested with two working display. iTunes can see the iPad with user's name. I cant see anything when I shine the light on it. It has 3.9v on both diodes without a display connected. GPIO_SOC2LCD_PWREN is 1.8v without a display connected and this should be 0v. I've checked against a known good working board.

this leads me to believe the PMIC is bad.

Any suggestion?

iphonerepair12 · 01-21-2018, 14:08

I have the same problem, measiring the same values after water damage. The damage was in the LCd FPC connector area and L4685 and L4680 are replaced. Connection to the FPC connector is checked and OK.

L4601 = 4V

Only on 1 side of R4605 , line GPIO_PMU2LCD_PWREN, I measure 1.7V and on the other side 0V, is this right?

Any solution?

10-27-2017, 23:12	#1 (permalink)
reddemonic Major Poster Join Date: Jul 2014 Posts: 47 Member: 2228871 Status: Offline Thanks Meter: 8	iPad Air 2 - no image. hi, i've a iPad air 2 here, no image, no backlight. liquid got on the LCD fpc and filters. I've replaced LCD FPC connector, filters, U4600, and diodes. I've tested with two working display. iTunes can see the iPad with user's name. I cant see anything when I shine the light on it. It has 3.9v on both diodes without a display connected. GPIO_SOC2LCD_PWREN is 1.8v without a display connected and this should be 0v. I've checked against a known good working board. this leads me to believe the PMIC is bad. Any suggestion?

01-21-2018, 14:08	#2 (permalink)
iphonerepair12 Freak Poster Join Date: Oct 2013 Posts: 105 Member: 2045117 Status: Offline Thanks Meter: 7	I have the same problem, measiring the same values after water damage. The damage was in the LCd FPC connector area and L4685 and L4680 are replaced. Connection to the FPC connector is checked and OK. L4601 = 4V Only on 1 side of R4605 , line GPIO_PMU2LCD_PWREN, I measure 1.7V and on the other side 0V, is this right? Any solution? Last edited by iphonerepair12; 01-21-2018 at 14:16.