A1278 MBP 820-3115-B powers up no chime

[Gimi]

Hi. got this macbook trying to repair and for last 2 days is sending me mad. Anyway it has been liquid damadged and after ultrasonic clean is now powering on with no chime. all around cpu i get short to ground.L7510,L7520,L7550,L7630,L7100 etc
I have checked for bad traces and damadged components but nothing visual.
Q7510,Q7520 gets 12v on pin 2 but pin 3 and 4 are shorted, would them 2 be the problem?
Any help? Thanks

[tata123]

Re: A1278 MBP 820-3115-B powers up no chime

Hey!

Check if CPU or Northbridge get hot?
Check the RTC clock gen!
Check SMC or BIOS!

[Gimi]

Re: A1278 MBP 820-3115-B powers up no chime

Hi. Thanks for your help. will be looking at that this weekend. Much appricieted .

[Parkhaus]

Re: A1278 MBP 820-3115-B powers up no chime

I have a similar problem,, I have a dim green light on the magsafe, fans spin immediately after plugging it in and I can turn it OFF by holding the button. Going to check PPBUS_G3H when I get home for short to power, but where could that happen, within the CPU?