I measured the following voltage rails and important nets.
Continue holding power button for another 5-8 seconds or so.Attach magsafe power cable, continuing the hold down power button.Disconnect magsafe power cable (no battery either).To power on the board without the battery installed, I do the following (not sure what this procedure is called): To be honest the logic board looks quite pristine for its age. I did a visual inspection of the logic board but I could not find any evidence of liquid damage or any obvious corrosion or damage.
A1286 LOGIC BOARD BACKLIGHT FIX PRO
Specifications: MacBook Pro 15" late 2008 Model A1286 Logic board part number 820-2532-A Symptoms: no chime, no video, white front power LED lit, green magsafe LED lit, DVD drive spins up, battery power indicator working. Even just trying to find a schematic and boardview (component locations) files for Apple products is a real pain. I know that most people on this forum either don't use Apple laptops or likely haven't tried repairing one before, but I figured I'd try asking here since most other Apple repair communities online require a paid subscription to get help or post on their forum boards. I am trying to repair an old MacBook Pro which I acquired that does not boot.