MacBook Pro not working, logic board help testing and fixing.
MacBook Pro 17" Models A1151 A1212 A1229...
I have a Macbook Pro (A1229, 17")
The Macbook pro was working fine untill recently, but now I have some very weird problems.
When I go and turn on the Macbook pro It takes a few presses on the power button to turn on. Everytime I press the power button I see the fans react. The blades twitch but will not turn on after the third press .
When it does turn on I get black screen, no back light, no chime and the white light in the front on the latch is steady white. no flashes nothing. I hear the hard drive spin up.
Before this happened If I had no RAM the front white light would blink now it does not. I have tried everything but nothing seems to work to get video. I
I assumed it was a SMC, PRAM issue so tried I doing a SMC rest and PRAM reset but did not work.
I started reading the forums and the answers on Ifixit. I decided to do a reflow but it did not work. I plugged it in and tried using the PWR ON pads ti turn it on but same symptoms but then I tried jumping using the SYS RST pads to restart but there was no reaction from jumping these pads as before there used to be.
As this is an obselete model, Apple will not repair it and a replacement logic board is something I dont want to think about yet but am more than confident I can fix this myself with the help from the comunity.
I have got the schematic from a google search in a PDF and started testing the logic board for voltages. I get the correct input and have tested the voltage rails that seem all correct but I am just not sure on what more to test.
I have test power on the SMC chip and there is.
I will really appreciate if some one can help me bring My Macbook pro back to life please
What do I have to test and what components do i have to replace.
Please help me
Many Thanks in advance.