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820-02773 MacBook Pro 13'' M2 A2338 get 5V 0A does not boot

S

slimmy182

Member
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)
PP3V3_S2_LDO 0V / 423
PP1V2_AWAKE_PLL 0V / 375
PP1V8_AON_MPMU 1.8V
PP1V2_AON_MPMU 1.3V
PP3V3_AON 0.35V (diode mode raising till 445 AND ABOVE ) (CLIKING NOISE)
PP0V855_S2SW_CIO 0V / 220
PP3V3_S2SW_SNS 0V / 455
PP1V2_S2_CIO 0V / 403
PP1V5_LDOINT_MPMU 1.49V
 
S

slimmy182

Member
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 ..
PP1V8_AON_MPMU 1.79V /402
PP1V2_AON_MPMU 1.20V / 407
PP3V3_AON 0v / 438
PP0V855_S2SW_CIO 0V / 244 …
PP3V3_S2SW_SNS 0.02V / 488
PP1V2_S2_CIO 0V / 509..
PP1V5_LDOINT_MPMU 1.50V / 271

U7700 LDO voltages / diode mode reads

PP3V8_AON_SPMU_ISNS_VIN 1.77V / 360
PP1V25_S2 0V / 265
PP0V88_S1 0V / 365
PP0V72_S2_VDD_LOW 0V / 262
PP1V8_AON_SPMU 1.80V / 678
PP1V2_AON_SPMU 1.20V / 700
PP0V8_S1_VDD_FIXED 0V / 240
PP1V5_LDOINT_SPMU 1.50V / 290
 
Last edited:
S

slimmy182

Member
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
 
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