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820-3115-B no chime and no picture after bad Waterdamage

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Fizzl92

Member
Hello,
i have problems with an 820-3115-B. The board had bad water damage and no green light. I cut off the bad damaged Thunderbolt area, replaced the SMC and a lot of other stuff. Now it has a green light and turns on again. The remaining problem is that it beeps if i take the ram out (speakers are ok) but wont chime. Also it has no Picture and no Backlight (missing LCD_BKLT_EN ; i already exchanged LP8550 and the LVDS witch were damaged too) Could it be an SMC Issue (bad soldering or maybe bad SMC ; but it has a green light after the SMC exchange)? At this point i´m stuck.
Thanks for any help!
 
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dukefawks

Administrator
Well, at this point it can be anything that stops the board from finishing POST. Everything is alive else it would not beep. Corrosion somewhere or under SMC/PCH/CPU. Maybe remove firewire chip if there was crap there. Does not look very good at this point.
 
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Fizzl92

Member
Could it still be affected from Thunderbolt? I "cut off" nearly everything from PP15V_T29 but there is still a short on that line. Could it be a bad soldering on the SMC i exchanged? Firewire Chip and area looks pretty clean still but if nothing else helps i´ll remove that chip too.
 
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dukefawks

Administrator
As I said this could be anything. Probably a short in the board from T29 rail. Bad SMC solder is possible, anything.
 
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Fizzl92

Member
Thank you for the help. If i have the time i´ll practice a bit with this one. Not everything is fixable but it was my first SMC exchange and it worked, so i learned from it...
 
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