Service manual

8 PDP 40” - SERVICING
SERVICING
TROUBLESHOOTING
NO POWER
Abnormal Picture
Replace Main Video Scan Converter
Loc # (20), Pt # 809-10722
Inspect (PD501) connector for proper
seating or for damage. Does video return?
Replace SMPS.
Loc # (18) Pn# 809-10723
Unload SMPS 12V line.
Does 12V return?
Is 12V present from SMPS?
Yes
No
No
No
Yes
ABNORMAL PICTURE
No Power
If problem is other than main Video Scan
Converter PCB. Contact T
.
echnical
Support at 877-9-ZENITH
Unload missing/low source. Turn unit on.
Does the source return to normal?
For additional technical support
Contact 877-9-ZENITH
Are any sources present?
Replace SMPS.
Loc (18), Pt # 809-10723
Is power control line on P808
(RLY) at 5.0V power on.
Check all supply voltages from SMPS.
Are all sources present?
Yes
Yes
Yes
No
No
Yes
N
o
No