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Thanks for you replies: Yes VCORE is present 1.05V, checked 3V3 SUS which is also present - have checked and have 3.3v at BIOS chip. Does anyone have a known good bios for this board? I've never had to flash this one before!

Got a strange 820-00165 in today - clean board no spillage - was quite a thick layer of dust on the top of it which i've cleaned off but have been unable to find any signs of corrosion anywhere. Board powers up but gives no display at all - caps lock doesn't react, usb mouse doesn't light up...

Hi Thanks for your suggestion! BKL_EN was 0V traced the problem down to the Pad under R7731 was corroded - not at all visible from the top! have since repaired the pad and put a new 200k resistor there and now backlight restored!

thought i'd just hop in here daniel - if your looking for somewhere to purchase a Crest from in the UK then take a look at sonikem - I got mine from them at a very reasonable price compared to everywhere else I checked!

Having an absolute nightmare trying to restore backlight to an 820-00165 which was liquid damaged. I had a small around of corrosion around the LCD connector which has cleaned up fine - most of the corrosion was around the backlight driver U7701 and its accompanying resistors. Having pulled the...

thanks all - i thought as much so have consigned this board to the scrap pile!

So i've got an 820-00045 board in for repair and the history given to me by the customer was the screen froze and the sound went odd then the macbook wouldnt give any display any more. On my testing: I've checked PP3v3R3v0_AON which is not shorted and is sitting at 3.31v as it should be PPDCIN...

my meter does read a little low normally - yes the battery is charging as normal. Keep meaning to invest in a better meter!

Thanks for your replies - can confirm after having replaced Q7180, U7100 and Q7130 again and also running a jumper wire for CHGR_PHASE from L7130 to C7125 the macbook is now charging and producing 12.3v PPBUS from the charger as normal. thanks for your advice.

Hope someone can help with this one as it's proving to be a complete pain. History: Macbook brought in with liquid damage and no power. Inspection revealed liquid damage around Q7130 which had also burned Q7130 and the CHGR_PHASE pad underneath. Smaller amount of liquid damage around U7100...

Yes that was with everything disconnected from the board. Decided to take a risk and pull the SMC off the board - looked fairly clean underneath if i'm being honest but testing PP3V42_G3H for shorts afterwards was showing 2.2k ohms and not the 45ohms it was before. It's pointing me to think that...

Given U7200 another look - can't see any other signs of corrosion around it. One interesting observation I have made is that the PP3V42_G3H rail appears to have quite a low resistance to ground 45ohms or so. I'm not sure if that is normal on this 2015 board as I do not have another one to...

Checked U1950 - looked clean but replaced anyway - unfortunately it hasnt made any difference. SMC has been reflowed also with no effect.

Checked for corrosion around U1900 - none visible. Replaced U1900 anyway from a donor board but same - still got cpu vcore but no chime/display. As for activity on USB - nothing at all with USB mouse or keyboard - if I plug a USB flash drive with a light on it though it does light up for a few...

Ok this one has gotten me completely stumped. Initially the macbook came in with water damage and the keyboard wasnt working. Opened it up and found Pin 4 of J4813 was burned away also some corrosion around Q7520. Replaced J4813 and cleaned up the area around Q7520 - turned on got to the boot...