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This board had liquid damage and was repaired by me. I replaced LVDS socket and ran a couple of wires for damaged traces round the LVDS area. Machine works perfectly fine until it goes to sleep - either by time or by closing the screen. When waking from sleep i get backlight (apple logo...

Sorry for the long previous post. You were correct as usual duke. PVCCSA_pgOOD was the problem and pulling the others down. U7100 looked fine, had enables and voltage but was not turning on. Replaced U7100 (and USB chip). Machine now working fine. Thank you may mark as closed.

Thank you for your replies. R7963 pin1 PVCCSA_pgOOD = 0.17V PIN2 ALL_SYS_PWRGD = 0.05V MEASURES 99OHM R7964 PINS 1& 2 0.05V CPUVCCIOS0_PGOOD=0.05V MEASURES 99OHM R7965 PIN1 p3V3s5_pGOOD=0.05V PIN2 ALL_SYS_PWRGD=0.05V MEASURES 100OHM R7966 PINS 1& 2 0.05V (P1V8SO_PGOOD) MEASURES 99OHM...

820-3208 Had powered USB device inserted, now does not turn on. No liquid damage, no burnt components that i can see green light present, goes to orange. CPU stays cold, PCH U1800 gets warm. PPBUS_G3H = 8.34v PPBUS_S5_HS_COMPUTING_ISNS = 8.38v PPBUS_S5_HS_OTHER_ISNS 8.36v PPVRTC_G3H = 3.3v...

History: board came in with no green light. No noticeable liquid. One cap on PP3v42 had a mark. Replaced cap and U7090 area. Now have green light Does not get hot, does not spin fan or turn on. pp3v42 - 3.4v green light present PPBUS_G3H = 8.15v = SMC not turning on ? Tried a light SMC...

820-2936 Old liquid spill Green light, fan spins no display, no chime, usb lights up R2805 area has hole. Replaced R2805. replaced U2800 & y2805 Ran wires to connect broken traces. Still does the same. Boo! Check power rails PP1V8_S0 1,792 PP1V5_S3 1.499 PP1V5_S3RS0 1.499 PP1V5_S0 1.503...

Hi There, lots of different ones. Have a look here: http://www.thebookyard.com/parts-unibody-macbook-pro-15.php?cPath=39_118_286&sort=2a&filter_id=14

That was my suspicion. Appreciate the help and confirmation. (can mark as closed)

Resistance to ground 0.9ohm. Diode mode 0v drop to ground. If i lift the coil L7630 i get 0.9ohm system side (pin2) and 470k other side - which matches the reading on my donor board.

Lifted the coil L7630 - short is on system side (boo). Removed C7623, C7648 & C7649 short still present.

Did some further checking. C7601 and PP1V05_SO is shorted to ground. Removed C7601 U7600 and short is still present. Would this stop the machine going to S4 ?

Hi Duke, Resistance to ground (red probe on cap, black probe on gnd) starts 4.83kohm then rises quickly and keeps going. Diode mode to ground (black probe on cap red probe on gnd) 0.455v drop.

My apologies. It was R1461 mentioned incorrectly as R1481 above. Thank you for telling me about the lower resistance. started again and re-checked power rails today. PPBUS_G3H 8.6v PPBUS_S5_HS_COMPUTING_ISNS 8.6v PPBUS_S5_HS_OTHER_ISNS 8.58v PPVRTC_G3H 3.32v PP5V_S5 4.99v PP3V3_S5 3.32v...

dry board. Green light on charger CPU cold, no light on USB fan spinning. Found exploded cap C7600 replaced it and U7600 to be safe. Checked for shorts to ground then tried powering. Get green light but no fan spin Missing PP5V_S4RS3 checked U7501 was missing P5VS4RS3_EN_R and SMC_PM_G2_EN...

I've tried taking these LCD's apart, its a ball ache of a job to get to the strips

I've had a lot with similar problems. If you've tried replacing the backlight board (661-5311) then it is most likely the LCD.

820-3115 liquid damage (to usual thunderbolt area and SYS_CLK area). Green light solid after some work. When AC power applied fan spins for 3 seconds then goes off then repeats PPBUS_G3_H 12.56v ISNSx2 12.6v PP3V3_S5 3.4v PP5V_S3 0v PP5V_S3 diode mode to ground 0.130v (same as donor) U7200...

Thanks Duke, i only have the 820-3536 schematic so i couldn't search all my PDF's for the chip number, that's saved me a lot of time! ( i knew that the were ram differences between 3537 and 3476 but didn't know about the Q7130) - yes U7100 got changed too - pins 23&24 were burnt out and Q7130...

I've got a 820-3476 which has charging / power issues. Had damage to U7100 area - shorted pins 23&24 17&18 - after some diagnosis removed Q7130 and shorts have gone away. Problem is i've only got 820-3536 donor boards and the Q7130 seems to have different pin placement. Does anyone know of any...

Ok. Thanks Duke.