IPhone 4s Strange LCD behavior after water damage repair - GSM-Forum

ERobinson · 06-21-2014, 18:56

Hi everyone,

I have an Iphone 4s I'm attempting to repair that had received water damage. Prior to my attempt, it would power on and boot to the home screen properly and the display seemed to be working fine, although the phone had other issues from the damage.

Now, after having cleaned the PCB and replaced the battery, all of the previous issues seem to be resolved and the phone is functioning properly except for one issue. The LCD screen will only display the apple logo when the phone is first booting, or insufficient power icon when the battery is too low to boot, or has just been plugged in. The LCD will not display anything after that, although the phone is functioning properly otherwise (I can use siri to send texts or calls for instance, and can use the digitizer to unlock the phone by guessing the location of the digits).

I would appreciate any insight anyone could provide into this issue.

ERobinson · 06-21-2014, 21:23

One thing I should have mentioned earlier is that the apple logo shown on startup or restart is only on the screen for a half-second or or so, and then the screen goes black again.

arvaser · 06-22-2014, 00:07

Hi, check carefully under microscope filters near lcd connector, i had this issue once and problem solved by removing and jumper the resistor (0.08ohm)

futur · 06-22-2014, 01:00

It's a water damaged motherboard so it will act up like this sometimes, and because of this I try to avoid invest any money on an upper part liquid damaged motherboard, lower part liquid damaged is totally different case.

06-21-2014, 18:56	#1 (permalink)
ERobinson Junior Member Join Date: Jun 2014 Posts: 2 Member: 2208907 Status: Offline Thanks Meter: 0	IPhone 4s Strange LCD behavior after water damage repair Hi everyone, I have an Iphone 4s I'm attempting to repair that had received water damage. Prior to my attempt, it would power on and boot to the home screen properly and the display seemed to be working fine, although the phone had other issues from the damage. Now, after having cleaned the PCB and replaced the battery, all of the previous issues seem to be resolved and the phone is functioning properly except for one issue. The LCD screen will only display the apple logo when the phone is first booting, or insufficient power icon when the battery is too low to boot, or has just been plugged in. The LCD will not display anything after that, although the phone is functioning properly otherwise (I can use siri to send texts or calls for instance, and can use the digitizer to unlock the phone by guessing the location of the digits). I would appreciate any insight anyone could provide into this issue.

06-21-2014, 21:23	#2 (permalink)
ERobinson Junior Member Join Date: Jun 2014 Posts: 2 Member: 2208907 Status: Offline Thanks Meter: 0	One thing I should have mentioned earlier is that the apple logo shown on startup or restart is only on the screen for a half-second or or so, and then the screen goes black again.

06-22-2014, 00:07	#3 (permalink)
arvaser Freak Poster Join Date: Jun 2013 Posts: 178 Member: 1952487 Status: Offline Thanks Meter: 43	Hi, check carefully under microscope filters near lcd connector, i had this issue once and problem solved by removing and jumper the resistor (0.08ohm)

06-22-2014, 01:00	#4 (permalink)
futur Freak Poster Join Date: Dec 2013 Posts: 452 Member: 2094769 Status: Offline Thanks Meter: 76	It's a water damaged motherboard so it will act up like this sometimes, and because of this I try to avoid invest any money on an upper part liquid damaged motherboard, lower part liquid damaged is totally different case.