Recent content by slimmy182

I finally managed to restore it by installing the logic board inside the Mac, keeping it connected to the power supply and at the same time connected to the Mac for the restore. No other modifications or forced DFU were required.

Thanks for your reply. Could you please specify which chips connected directly to the CPU you would recommend checking on this board (820-02098)? I already inspected the SPI ROM path (U2000/U2010, U2040, series resistors) and power rails, but if there are other ICs known to affect the CPU or...

Here’s the current status and all the checks done: Power rails Always-on / Awake: PP1V8_AWAKE ≈ 1.8 V (C2041) – stable PP1V2_AWAKE ≈ 1.2 V (C2040) – stable PP3V3_AON ≈ 3.3 V – present PP3V8_AON ≈ 3.8 V – present PPBUS_AON ≈ 12.3 V – present CPU awake: PPVDD_ECPU_AWAKE ≈ 0.64 V idle, drops...

I replaced U2010 and U2020 with parts taken from a donor board. Now I have: PP1V2_AWAKE = 1.22 V PP1V8_AWAKE = 1.77 V However, the Mac still does not power on. With the battery connected: power adapter negotiates 20.63 V, 0 A, 0 W. With the battery disconnected: 5.192 V, 0.182 A, 0.996 W...

Checked resistor dividers / pull-ups (R2020–R2025, R2030–R2032, RD215, RD216, RR664, RR734) → PP1V8_AWAKE side low, signal side high. Confirmed short not on SoC side of I²C lines (pin toward SoC always OL/high). Removed UR600 (IC on the rail) → no change. Began isolating speaker amp blocks...

Thanks for the comment. We’re on the same page with Ohm’s law. Earlier, before removing U2010, PP1V8_AWAKE ≈ 4 Ω → at 1.5 V the draw was ~0.35–0.40 A (PSU stayed in CV). After removing U2010, the rail measures ~8 Ω → at 1.5 V the draw is ~0.18–0.20 A (also CV). Both figures match I = V/R. For...

Hi all, I’m working on a MacBook Pro 14” 2021, board 820-02098, no power. I’ve been focusing on the PP1V8_AWAKE rail which seems problematic. Here is what I’ve tested: Symptoms: Board does not power up. Power-in: ~5.1 V / 0.47 A (~2.45 W) With thermal camera, U2020 was initially hot (>70...

It's the same behaviour prior to replacing U8100. That could point to bad M1 chip? Any way to confirm this? What would you do in this case, reflow the chip again? Change also U7700? Any hint is really apriciated

All missing pad was NC (double cheked). New U8100 placed (from china). That's new reads: U8100 LDO Voltages / Diode mode reads PP3V8_AON_MPMU_ISNS_VIN 3.78V / 350 PPVDD_LDO20_14_8_3 0V / 263 PPVDD_S2SW_VDD2H 0V / 030 PP1V8_AON 0v / 469 PP3V3_S2_LDO 0V / 460 PP1V2_AWAKE_PLL 0V / 443 ...

Got new U8100. Do you think those pad are all good? Ready to solder the chip?

DAMN, this is not my post, I was reffering to my problem on 820-02773. I'm really sorry about that

Thank you. They are all NC according to boardview. The pad I was referring is the one in the center

Do you think that pad could be a problem? it's U8100 pad 136 MPMU_AMUX_BY Also Caps nearby U8100 need to be all present? I lost C8167 C8169 C8183 :(

RD570 1 PP3V8_AON 3.78V 2 PP3V8_AON_MPMU_ISNS_VIN 3.78V 3 ISNS_MPMUHS_P 3.78V 4 ISNS_MPMUHS_N 3.78V U8100 PP3V8_AON_MPMU_ISNS_VIN 3.78V PPVDD_LDO20_14_8_3 0V / 258 diode mode PPVDD_S2SW_VDD2H 0V / 033 PP1V8_AON 0.18V (diode mode raising till 445 AND ABOVE) (CLIKING NOISE)...

Tried with RV005, but no luck. The fact is that I don’t have any voltage in PP1V25_S2. Additionally, PP3V3_AON is at 0.35V.