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?
Cette question est-elle utile ?
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...
par honakrisi
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.
par 21Eddie93
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.
par honakrisi
No short around U7650, input signal P5VS5_EN is 3,402V.
par 21Eddie93