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pp3v3_g3s 3.3v pp1v8g3s_ss 1.8v

This arrived with liquid damage on U6903. Replaced U6903 and surrounding components. Goes to 20v 0.13a now. PP2V5_NAND_SSD0 is 0v with an odd type of short. If the board is not powered on for a few minutes diode mode is .335 After power is applied and after checking about a minute later a...

Solved. Found another screen in the shop with a crack in it for testing purposes and now have internal image.. For future reference, looks like it is possible after all for the MLB to damage the LCD since this was never opened up prior.

Same issue after PRAM reset and CMOS battery removed. What should be tried next?

This arrived turning on with fan spin but no led light #3. Most likely thought it was the GPU after replacing the 3V battery and pram reset. Using a replacement tested 820-00292 board, all leds come on, you can hear chime but only backlight appears on internal LCD. External video works fine...

No reaction when trying to enter target disk mode, just the apple logo. Also have the Apple data recovery tool via J9600, tried that and drive never appears on the other macbook

When booting from external USB macOS with J9600 disconnected the critical update screen appears and fails. Does this point more toward a SSD issue now?

Arrived with minor liquid damage in the U4200 area. Also some in the UB400 area. Replaced a few capacitors affected by the liquid but no changes. When board is booted you can hear the chime, see the apple logo on internal LCD but no progress bar ever appears. Using known good battery and apple...

C6900 12.30V R6900 and R6907 are good diode mode L69000.340

Looks like a bad U6903. CHGR_EN_MVR was 0v and shorted. Replaced U7000 CHGR_EN_MVR now present 5v PPVIN_G3H present 12.30V PP3V3_G3H still 0v Replaced U6903 from donar but no change. Also changed C6903. Ordered some replacement TPS chipsets will update once replaced again.

PP3V3_G3H actually 0v I mixed up measurement with the present PP3V3 _LDO

U7650 missing enable. P5VG3S_EN 0v

R7900 1ohm 0V

PP3V3_S5 is only 0.250V but cant find what creates it on schematic. Not shorted .380 diode mode

Arrived with minor liquid damage and stuck at 5v. CD3217 LDOs are good. PPBUS_G3H 12.30V PP3V3_G3H 3.3V LPS2R and AWAKE voltages are all 0v not shorted. L7806-L7809 around U7800 are all OL diode mode LDO_RTC 0v Does this sound like bad U7800??? Should anything else be checked?

Solved after replacing the battery. The other post with similar issue that claims this board boots without a battery is incorrect.

Board alone on desk with only charger connected VCORE remains at 0v If battery is connected, vcore is 0.780V before dropping to 0v in a few seconds Using 96W apple charger

No, same problem. No change

2.1ohm after replacing all of them.

Yes. Starts at 0.790V drops to 0.260v goes up to 0.395v then drops to 0v