Section 2-3. Dvd Part; Electrical Troubleshooting Guide - Toshiba SD-42HKSB Service Manual

SECTION 2-3. DVD PART

ELECTRICAL TROUBLESHOOTING GUIDE

1. µ-COM Circuit
A. No Power
YES
Does Logo appear
on the screen?
YES
OK
1
Is oscillation of
X501 normal?
YES
Are IC501 Pins193, 80
and 81 normal?
YES
A
Does no DISC appear?
NO
NO
NO
Check the oscillation
NO
Check short.
OK
Replace IC501
POWER ON
NO
Does CD/DVD
appear at FLD?
Is P5101
NO
connected normally?
Reconnect it.
Refer to Front Part
Check short
Replace IC301.
- 2-39 -
YES
Check power.
(Refer to power)
If power is
normal
NO
Is P5501 Pin8 normal?
YES
A
The waveform
NO NO
on AD(00~21) of IC501
normal?
YES
NO
Are IC305 Pins68 normal?
YES
Replace Main B/D.
1