Hitachi DV-DS163E Service Manual page 30

Details of Servicing and Troubleshooting > Troubleshooting
No 5.0VD
NO
IC153 Pin1 :
Approx. 5.3V?
YES
NO
IC153 Pin4 :
Approx. 4V - 5V?
YES
Check IC153, and
replace if necessary.
No 2.5V
NO
IC151 Pin1 :
Approx. 3V - 3.8V?
YES
NO
IC151 Pin4 :
Approx. 4V - 5V?
YES
Check IC151, and
replace if necessary.
Check 5.3VA
on SMPS P.C.B.
Check the PWR_CTL_H
signal from IC701 Pin43.
Check D154 and D127
on SMPS P.C.B, and
replace if necessary.
Check the PWR_CTL_H
signal from IC701 Pin43.
3 - 10
No 3.3V
NO
IC152 Pin1 :
Approx. 3.8V?
YES
NO
IC152 Pin4 :
Approx. 4V - 5V?
YES
Check IC152, and
replace if necessary.
No SW_5.3V
NO
Is Vcc (5.3V)
supplied to Q158 Emitter?
YES
NO
R179 and R156 :
Approx. 0V?
YES
Check Q158, and
replace if necessary.
Check D127, and
replace if necessary.
Check the PWR_CTL_H
signal from IC701 Pin43.
Check 5.3VA
on SMPS P.C.B.
Check the STANBY_H
signal from IC701 Pin47.