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Yes PPVCORE_S0_CPU is 0.7v. I didnt have the heatsink on so maybe that's why it was on high speed fan. USB mouse led only works on 1 port. I checked L4610 was bad. Pin 3 and Pin 4 are open. However, I have replaced L4610 still no good. PP5V_S3_RTUSB_B_F = 5v. Bad D4610 or U2600? The diode...

I have put in a jumper between and now the fan spin but stay high speed, I have got mouse led too. But C7272 actually came off with corroded solder pad .... is it OK to leave that removed?

Board has liquid damage with obvious corrosion around C7272/C7273 and also around F7040 area. Green light. No fan spin. U7200 generates PP5V_S5 and has 5V when measured at pin 1 of C7273. However, when measure the same PP5V_S5 at C7801, it is only 3.05V. But when I tried to measure the...

You are probably right... I removed R5413 and the short is coming from PP1V8_S0GPU_ISNS...

The other board has more vram than this one. Would it works?

I dont have a known good bios but I downloaded one from the internet... still the same.... Do you have a known good?

you are right, i didnt have the heatsink on so one of the temp sensors wasnt connected. I connected the heatsink back and not more high fan spin. But still no chime and black screen.

removed L9320 and found short to ground on Pin 2. removed C9340, C9341, C9342, C9343 and U9300, short still not going away.. R9321, R9322 not short..

I can turn it on and off with the power button..it even has orange light if i put in the battery. But it doesnt respond to PRAM reset key sequence.

I did. There is no reaction.

I was told this was a "new replacement board" from somewhere and the board is shiny and ultra clean [not entirely sure if it has been cleaned or what not]. There wasnt any sign of prior repair attempt. Having said that the GPU could still be the culprit as both of you mentioned. I am just...

PP3V3_S5_AVREF_SMC = 3.3v Is that what you mean?

No sign of water damage, board is clean. Fan blast high speed as soon as magsafe is plugged in, led is green. Screen is black. No Chime. When ram is in, no beep, When ram is out, slow ram beep. Put the ram back, no beep. I measured all the power rail and all the voltages are correct, except...

L7630 = 1.05V Let me try to remove Q7950 and report.

PM_MEM_PWRGD = 3.3v diode mode = 347 ISOLATE_CPU_MEM_L = 0v diode mode = 460 Just in case... I re-measured all of the power rails on page 7 again and here are the strange one: PP5V_SUS = 3.05v PP1V5_S3RS0 = 0.35v PP0V75_S0_DDRVTT = 0v (Is this because U7300 Pin 17=0v ?)...

R1702 is good. Diode mode reading is 144. But voltage is only 0.35v.

diode mode reading 341. Voltage is 1.48v So I have PP1V5_S3 but no PP1V5_S3RS0/PP1V5_S3_CPU_VCCDQ?

L7330 resistance to ground is 5.25K.Is it good or bad?

U7300: Pin 12=4.95v Pin 6 =1.77v Pin 16=3.27v Pin 17=0v

R7402 is fine U7400: Pin 15 = 4.96v Pin 24 = 4.96v Pin 40 = 4.96v Pin 1 = 0.06v Pin 2 = 12.33v