820-3437 Bugs in the image!?

[deephouse]

Hello,
There is a disturbance in the screen image.
A Brief History: Small Water Damage. The motherboard did not start. Corrosion near U2500, U3210. light heat in U3900 and U2800. I replaced the C2411 and the board started. I also replaced C3280.
then these strange pixel bars are present. Their presence changes when the system is used. Small irritants even sometimes disappear.
F??k them, what's their problem?

 

[JohnB8812]

Does it happen externally? If yes, CPU is damaged. If no, then bad LCD.

 

[deephouse]

Hello JohnB, thank you for your reply. Bad news. The defect is present on an external monitor. CPU, the whole area looks clean. Does it make sense, to wash it in the ultrasonic tub?

 

[2informaticos]

If the problem exists on external monitor too, then should be RAM, or CPU issue.
Check resistors and capacitors for U2500 RAM chip and others near the affected area.
You can try to heat RAM chips, using good flux; NO "chinese honey" allowed!

 

[JohnB8812]

I'm with 2informaticos inspect for anything knocked off by the RAM and reflow the 4 RAM chips. If no change, this is junk.

 

[deephouse]

Hello 2informaticos, thanks for the reply. A New Hope in Bord Wars!