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CPU Core voltage is present 1.8v on Phase 1 and 2 PLT_RESET_L is also present at 3.3v I got the machine to post once when I heated up the clock chip U1900, but only once then it returned to the current status. I did try and replace U1900 from a donor board but it didn't change anything.

Just had a very clean 820-4924 board in today, but it's not posting/chiming. The CPU is heating up when the charger is connected as is the SSD, no image on the screen and no USB activity however. SMC reset works normally (light changes on the charger) No visible signs of corrosion anywhere that...

Right so with Pin 20 isolated (made a small cut on the trace going to the test point) P3V3MAIN_PGOOD is present. Would this mean bad U7650?

No the other G3s voltages are still not present - PP5v_G3s is reading a tiny amount around 0.03V and its enable signal P5G3S_EN is still missing. I did try it once more with the charger and thermal camera and i'm seeing a tiny amount of heat from U4850 - we're talking board is 16C and this IC is...

1v8_G3s is still missing but no longer shorted. I also took U6400 off again just to confirm that wasn't affecting anything but it hasn't changed anything!

Well Audio Amp out U6400 - no change. Basically then went through the process of removing and reinstalling every other part on PP1V8_G3S until I got to the Wifi IC, After removing this the low ohms reading on PP1V8_G3s is gone and it's now reading 3Kohm. Unfortunately this hasn't changed the...

Think I might be getting somewhere with this one, comparing with another board I found PP1V8_G3S is showing a 40ohm resistance to ground so not fully shorted but certainly abnormal. The problem is however even if I inject the full 1.8v into PP1V8_G3S I get no current draw and nothing visibly...

Just got an 820-01958-A in symptoms are stuck at 5V on USB-C Meter, no signs of life and 0.10a current draw. Visual inspection reveals: Damaged flex cable between audio board and main board No visible corrosion or water damage present. Device is not visible when connected to another mac with...

PM_PWRBTN_L is not doing anything at all when triggering SMC_ONOFF_L - stays at 0v and doesn't pulse up or anything. SMC_ONOFF_L is 3.3V and drops to 0v when the power button is pressed. Tried SMC Bypass mode all that happens there is that the charger sticks on 5V and still the machine does...

There are no S5 voltages and as such 0v on PM_PWRBTN_L, I haven't checked if there is voltage on SMC_ONOFF_L but I can do.

Got an A1707 820-00281, symptoms it takes 20v but doesnt draw any current. PPBUS_G3H, PP3V3_G3H are all present at 12.58v and 3.3v No S5 or SUS voltages are present and there are no shorts which I can find. PP3V3_PMICLDO = 3.3V PP1V25_PMICVREF = 1.24V PP3V0_G3H = 3V PM_SLP_S5_L is low 0.2v To...

L7210 - 0.930V L7220 - 0.930V L7370 - 1.044V All three are stable No voltage on L7410, L7420 or L7430 Should've said before that I did try external monitor and there is no output there either.

So got an A1708 in today doesn't appear to turn on, When the charger is connected it does go up to 20v and also appears to charge the battery - the trackpad clicks but nothing on the screen. No fan spin but the CPU does appear to be getting warm. Caps lock doesn't light up when pressed, PRAM...

Yes behaviour is the same with and without the charger connected. Battery as fitted has around 75% charge so is nowhere near a low level! I found a workaround where if I start the machine up with the charger only connected and then connect the battery up it continues to work and behave normally.

So last week I got in an A1708 with 820-00840 board just for a straight battery swap, took the old battery out as usual no issues, connected new battery up powered on and I get the flashing folder with ? symbol. Replugged the SSD - same behaviour - unplugged battery and tried without battery -...

Well we can put this one as solved - U9080 had a tiny bit of corrosion underneath which after removing, cleaning and fitting a new IC has resolved the issue. Thank you for the pointers in the right direction! Luckily the SSD has survived this stupid design by apple to put this controller so...

Diode Mode to ground on PPBUS_G3H - 0.398 L9080 - 0.371 L9580 - not present on this board None of the other coils read anywhere near the same reading and I did already check if any of them were shorted to PPBUS_G3H previously (Forgot to mention) After removing F7000 and F7001 and i'm getting...

Got an A1990 820-01814 which is stuck at 5V with no current draw. Occasionally it does switch to 20v and also with no current draw and no power but i havent seen it do that very often! It was slightly liquid damaged around JB200 and C9080 - i've cleaned up both areas and no issues there, have...

So a little bit of backstory on this one I received an A2338 820-02020 in for repair again. This is a device we previously repaired around 9 months ago for no power - in that instance we replaced one of the CD3217's (UF400) as it was burned out which fixed the problem. Same device has come...

The configuration you did is correct if you replaced all RAM chips with the ELPIDA ones of 16GB and 1866 speed. If however I am reading this correctly - you left the Hynix ones on the board and just added 8GB of ELPIDA chips? You cannot mix and match like this you need to have the chips all...