Search results

A combination of your ideas worked! The screen does not work, and I have to open and close the lid a few times for the external monitor to display a picture in clamshell mode. I went over both sides of the board again and cleaned up anything that looked remotely suspicious, and tried HDMI...

820-02100 with water damage, corrosion around U5200 but was cleaned with IPA. Device chimes, touchpad clicks, successfully negotiates from 5V to 19.5V and hovers between 0.006 and 0.4A. It will spike for only a second up to 1A, then immediately drop down to 0.1A - if left long enough, it will...

While waiting for the new BGA chips to arrive, any ideas or rails/components to check?

Macbook Pro A2141 with corrosion around R9581/C9582 (U9580 BGA chip exterior). Used to pull 19.5V 0.39/0.4A draw, often dropping to 0A and going back up to 0.4A again with Type-C power; the T2 gets warm but nothing else really happens. Big Coils Diode Readings: L9080 - 0.412 L9580 - 0.003...

Strange update: the laptop now turns on completely, drawing 1.8A and I get to the login screen. I have no clue what happened, but the laptop does seem rather unstable - sometimes I get a panic during boot, sometimes it is fine.

I don't have a working board available yet, it has been ordered and will arrive in the next few days. I have tried DFU with keyboard combination and a DFU jumper wire, it doesn't appear in Apple Configurator at all. I'm not sure if I am doing it wrong or not. I tried a wire jumper from R8010...

Apologies, the voltages: L8100: 1.2V L8102: 0.95V L7670: 5.1V L7690: 3.3V L7290: 0.87V

L8100: 0.22 L8102: 0.13 L7670: 0.434 L7690: 0.408 L7290: 0.04

L7600/60, L7270 and L7702 are not found on boardview, not sure if it is a typo or something not present on this board. L8100/2: 0.22 diode reading This is the only one I can find, unless I am misreading what you said.

I used the OpenBoardData to check diode readings, all readings except one match: L7030, CHGR_PHASE1 (and 2, the other side of the coil). OBD says it should be a diode reading of 47, with 276R. When measuring, I get a reading of 0.46 with 147kΩ of resistance to ground. No USB activity, no Caps...

Those are voltages. I posted that reply before yours appeared, since I was already measuring them when your reply was posted. I only saw your response after submitting the reply. I need to order a known good board to check the diode readings you said about, which should arrive next week. Said...

Understood, I did consider PCH/CPU may be damaged from this. I will see if I can get a known good board ordered in, we do not have any on hand.

PPBUS_G3H = 12.60V PPBUS_HS_CPU = 12.61V PPDCIN_G3H = 19.51V PP5V_S5_LDO = 5.13V PP3V3_G3H_RTC = 3.3V PP3V3_G3H = 3.3V PP3V3_G3SSW_SNS = 3.3V PP3V3_G3S = 3.3V PP3V3_TBT_X_S0 = 3.3V PP2V7_NAND = 2.516V PPVCC_S0_CPU = 0.72V PP1V8_SLPS2R = 1.8V and 1.8 in diode mode, stable Additional voltages as...

I have an A1932 820-01521-A board that came in for no power. When tested, it did power but no chime/backlight/fan spin. It was stuck at 5V and the meter kept cycling - 5V 0.2A then resets. Inspection showed U3000 had a hole blown in the middle of it, so it was replaced. No more cycling issues...