ACER E5-574 Z8V REV:E NO POWER ON, NO VCCSA
Test Admin (26 Jul 2025)
ACER E5-574 NO POWER ON
No 3v 5v only LDO, NO BATT SM BUS LID 0V
RBFET. 25V GATE
FOUND PU4 AS393 FAULTY WITH Moisture DAMAGE
VOLT TEST FAULTY AS393 Pin1. 1.54V Pin2. 1.63V Pin3. 0.90V Pin4 GND Pin5 0v Pin6 0v Pin7 0v Pin8 0.65V |
AS393 OK READING PIN1 0V PIN2. 4.2V PIN3 2.57V PIN4 GND PIN5. 0V PIN6. 0V PIN7. 3.2V. PIN8. 18V
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REPLACED FAULTY AS939 NOW POWER ON
3V 5V ALW 1V. (1V SOURCE GATE 17.5V)
1.2V ,2.5V, 1.8V EXIST
PSU SHOWS 0.014AMP BULE LED LIT
BUT No VCCSA, NO VCORE
TEST ISL95859
PIN33 VIN. 19V
PIN34 5V
PIN35 DATA. 1v
PIN36 ALT. 1v
PIN40 VRON. 3.3V
PIN38 VRHOT. 0.9V
FOUND 08_XBR ( ISL95808HRZ_DFN8) PWM DRIVER PIN2 IMPEDANCE LOW i.e. DV120 (620 OK)
REPLACED PWM DRIVER NOW PSU 0.452AMP (NO RAM)
0.1009V VCCSA
0.985V VCORE
DISPLAY TESTED BY USB INIT
ADDITIONAL PINOUTS KBC
IT8987E PIN106 FSPI PIN11,92,121. 3.3V PIN72 ACIN PIN12 VCORF PIN14 WRST# PIN100 S5ON PIN95 1V S5_ON PIN112. RSMRST# PIN2. SYS_SHDN# | IMP POWER PINS PIN107 NBSWON#. (SW1) PIN122 DNBSWON# PIN119. SUSB# PIN120 SUSON PIN18 SUSC# PIN30 MAINON PIN33 EC_PWROK PIN78 PCH PWROK PIN69 VRON |