Hitachi DV-DS163E Service Manual page 28

Details of Servicing and Troubleshooting > Troubleshooting
No 5V for HDD & DVD
NO
IC156 Pin1 :
Approx. 5.5V?
YES
NO
C156 Pin4 :
Approx. 4V-5V?
YES
Check IC156, and
replace if necessary.
Check D125, and
replace if necessary.
Check the PWR_CTL_H
signal from IC701 Pin43.
3 - 8
No 12V for HDD & DVD
NO
IC155 Pin1:
Approx. 13.5V?
YES
NO
IC155 Pin4:
Approx. 4V-5V?
YES
Check C155, and
replace if necessary.
Check D124, and
replace if necessary.
Check the PWR_CTL_H
signal from IC701 Pin43.