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Should I just get 2 replacement chips and replace both?

Finally got around around to measuring this: U3100 LDO_3V3 - .006 LDO_1V8A - .526 LDO_1V8D - .027 LDO_BMC - .51 UB300 LDO_3V3 - .007 LDO_1V8A - .522 LDO_1V8D - .006 LDO_BMC - .521 U3200 LDO_3V3 - .433 LDO_1V8A - .528 LDO_1V8D - .493 LDO_BMC - .522 UB400 LDO_3V3 - .446 LDO_1V8A - .538...

Yeah didn?t include that on purpose as it?s a duplicate pin. What do you mean by good?

Yup the battery did the trick! Now the values match my old meter. Voltages at U1950 are: Pin 1 - 3.3V Pin 2 - 1.7V Pin 3 - 0V Pin 4 - GND Pin 5 - 0V Pin 6 - 0V Pin 8 - 3.4V hope those help

Used my old meter (not my nice PeakTech Unit) and got 1.728V. CPU_VR_READY is 1.8V. Hope that helps

Oof completely forget the board number. Me idiot! It?s the 820-3536A board. I have no history on this one. When I pulled the board out I did notice a prior repair though which always sucks. They ran a jumper from L1295 to C1297 as well as replaced C7371. I did try the normal resets without...

Have this A1502 here which is missing its display and I sadly have no test displays. So I attempted to power it up and the fan spins but it doesn?t chime or output a signal to an external display. Anyone got a clue what could be going wrong?

It heats up a bit, yeah... Should I order a new PCH from AliExpress or get one from a donor board and attempt a replacement? Never replaced a PCH before though I did a CPU upgrade on an 09 white MacBooms so it shouldn't be much dirfferent...

Yeah. Probably financially an absolute waste of time. But I just wanna get this fixed no matter what. Yeah I?m weird. Replaced U6990 but that helped nothing. Any way I can find out if the PCH is actually bad? I mean if I knew it was I?d replace it but I?m not sure if it is...

Oof. more issues! No fan spin or anything. But then I noticed a big fat burn mark on R6920. Replaced it but now the green light comes on for about 5 seconds before turning off and with freeze spray I can see R6902 immediately heating up. Any idea?

Yeah, that could be as with a cold board (room temp) its now .096 I did change the caps but U7201 and Q7260 is the original replacement as I didn't have any and waiting fo china would take ages L7030 is .486

With the parts back on the board its .087 on L7260 and .42 on L7220

What do you mean by low value? What is normal?

UPDTAE: I got my new Bench PSU and after going through a can of freeze spray with a draw of 1A I found C7293 to heat up. Removed it alongside C7292 and now it draws .001A at 1V and the diode mode on L7260 changed to .108 Any better?

Huh I see 4 or is one an Input?

Also these pin labels don?t correspond to my Board view

Which LDO Line?

Remeasured everything.... D6902: Pin 1 - 5.4V Pin 2 - 0V Pin 3 - 5.3V Very interesting, the board briefly went to 20V at .161A for 60sec before going back down to 5. But now its no longer drawing .020A but 0.15A... While it was at 20V I got these readings: U6903: Pin 1 - 0V Pin 2 - 5.2V Pin...

This one is confusing me

So PPDCIN_G3H_CHGR_R (Pin 1) = PPBUS_G3H_R (Pin 2)?