Recent content by ronaldo

I tried revive and still same.

Only backlight. Image is fine.

No liquid damage or visible physical damage. Customer initially stated it suddenly no display. All the diode measurements on the Backlight power circuity matches a good board. Replaced UP800 (backlight boost IC) twice, also reflowed Replaced DP800 Replaced QP800 (backlight power switch MOSFET)...

Tried that and it did not work. Same as before.

Do you think the CPU is gone?

The customer stated that it was purchased second-hand / refurbished. I tried to revive with a 87w charger, and the battery charged, but it got stuck on installing the system.

Hi, I need help with this Mac. The trackpad is clicking. The only components showing signs of heat are the T2 chip and the battery coil. There's no short on the coils, and diode mode is normal. PPBUS_G3H - 12.6V SLP2 and AWAKE voltages are present. NAND power rails are at 0.9V, 1.8V, and 2.5v...

That's crazy. I found R8170 OL and is supposed be 200K. Resistor replaced and still same.

Yes, I'm actually testing it alone. But even with the battery is same. I found P5VS2TPS_PGOOD wrong reading on diode mode. Q6070 relaced and now it's correct, but still same.

Yes, still cycling. PPVDD_DISP_AWAKESW - 0.160 / FlexBV-0.210 All the lines are matching a working LB apart of this above.

Q5216 replaced and CHGR_AUX_DET is 0.545

R5215 is supposed to be 750k and was 450K R5216 is supposed to be 255k and was 149K After replacing both the CHGR_AUX_DET is now 1.28V CHGR_AUX_DET still 0.466 in diode mode.

R5215 Pin 1 - CHGR_AUX_DET - 132Kohm / Diode 0.470 - On a working board according to FlexBV it should be 0.549 Pin 2 - PPDCIN_AON_CHGR - 70Kohm / Diode 0.620 AUX_DET_SHORT - 0V P0V9_LX0_NAND0 - 0.320 P1V2_LX0_NAND0 - 0.309 PP2V5_NAND0 - 0.307

Battery charging / PPBUS IC RAA489900 - Replaced and same results.

PPDCIN_AON_CHGR_R |P_IN 5.13V CHGR_AUX_DET 0.86V VDDA 4.6V VDDP 4.6V EN_MVR 4.5V ~ 4.7V AUX_OK 1.78V CHGR_AMON 0V CHGR_BMON 0V