board 820-00239-A no power

Hi guys, i have a problem with board 820-00239-A (no liquid damage). In short was U8000. After change still no power on but charging. I try change U7800 but still doesn’t work. Here is all result:

3V3_G3H - 3,3V

PPBUS_G3H - 13,05V

PP3V0_G3H - 3,078V

PP3V3_S0 - 0V

PP3V3_G3H - 3,404V

PP3V3_SUS - 3,352V

PP3V3_S5 - 3,354V

PP5V_S0 - 0V

PP1V8_S4 - 0V

PP1V8_S3 - 0V

PP5V_S4 - 0V

PP3V3_S4 - 0V

SMC_DELAYED_PWRGD - 0V

CPU_VCCST_PWRGD - 0V

SMC_ONOFF_L - 3,4V

RTC_RESET_L - 3V

ALL_SYS_PWRGD - 0V

S5_PWRGD - 3,265V

PLT_RST_L - 0V

PCH_INTRUDER_L - 3,078V

PCH_SRTCRST_L - 3,057V

PPVCCPRIMCORE_SUS_PCH - 1V

PM_PCH_PWROK - 0V

PM_PCH_SYS_PWROK - 0V

PM_SLP_S5_L - 0V 100kO to GND (R1454)

PM_PWRBTN_L 3,3V

PM_RSMRST_L - 3,351V

PM_BATLOW_L - 3,335V

PM_DSW_PWRGD - 3,4V

PM_SLP_SUS_L - 3,354V

PM_SLP_S0_L - 3,352V

PM_SLP_S3_L - 0V

PM_SLP_S4_L - 0V

PM_SLP_S5_L - 0V

PM_SLP_S0S3_L - 0V

Is dead CPU?

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Are the other PPBUS rails present? PPBUS_HS_CPU, PPBUS_HS_OTH5V, PPBUS_HS_OTH3V3 ?

From the list above, until you have output on ALL_SYS_PWRGD your system will not start up. Unfortunately you need to go through all the PPBUS rails first and all the S5 rails before you can move on to S4, then S3 and so on...

There´s results:

PPBUS_HS_CPU - 13,04V

PPBUS_HS_OTH5V - 13,04V

PPBUS_HS_OTH3V3 - 13,04V

PPBUS_S4_HS_TPAD - 13,05V

PPBUS_PMIC - 13,06V

PP5V_S5 - 5,01V

P5VS4_PGOOD - 0V R7801 100kOhm and diode 0,425V

S5_PWRGD - 0V, R7802 85,5kOhm and diode 0,456V

After change U7650 S5_PWRGD is still 0V but now R7802 is 100kOhm.

I would look around the U7650 IC as it seems you have the voltages that power it but the enable signals could be missing and therefore you are not getting the PWRGD signal outputs.

No short around U7650, input signal P5VS5_EN is 3,402V.

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