4
3. Board Selection by Defect
Chapter 3 - Board Selection by Defect
Table 3-1 shows the boards that could cause the symptoms listed. The most likely board is designated #
1
,
second likely #
2
, etc. Two #1 means both boards have an equal probability. To resolve the conflict, testing is
performed in the Standby/Power ON, Fan Drive, Video Flow circuit descriptions (Chapters 10-12) or the Plasma
Panel picture defects (Chapter 4).
For isolation purposes, the TU (tuner board) may be unplugged and the TV will work, displaying video inputs.
Table 3-1 - Plasma TV model KZ-32TS1U / KZ42TS1U Board Selection by Defect
Probable Circuit Board Failure
Symptom
B*
H1
Power
Supply**
Q
TU
Plasma
Panel
***
Audio Problem – all inputs
2
1
Audio Problem – TV channels (deselect SAP)
2
1
Dark Screen – sound OK
1
2
1
Dark Picture – sound OK (deselect Power Save
on the remote)
1
1
Dead Set - No relay click at plug in
2
1
3
Dead Set – Stby light OFF. No response to
front panel pwr button. Plug -in relay click
heard.
3
2
1
4
Dead Set – Except for Stby light ON. No
response to pwr button. Plug -in relay click
heard.
2
1
3
Fan not cooling (front panel Standby indicator
blinking.) See
the
TV menu and Fan block
diagram in Section 7. Fan NG = No voltage to
fan. Temp NG = Fan not working.
3
2
1
Noise Bars across the screen (horizontal)
The rear metal shield must contact the conductive mesh
on all four sides and be screwed to the center TV board
assembly.
Standby Indicator blinking 2 times
2
1
Standby Indicator blinking 3 times
3
(2 = fan)
1
Standby Indicator blinking 4, 5 or 6 times
2
1
Video Distortion – With composite and S video
input only.
2
1
Video Distortion – With component (Y, R-Y, B-
Y) input only.
2
1
Video Distortion – With both composite and
component inputs. Try using the menu’s
“picture inversion” to “clean” the screen first.
1
2
3
Symptom
B *
H1
Power
Supply
Q
TU
Plasma
Panel
**
*After B board replacement, adjustments for brightness and color balance are necessary. See Adjustments.
**The entire power supply board is listed in the service manual as “Switching Regulator”. The 32” and 42”
TV sets do not use the same Switching Regulator power supply and therefore have different part numbers.
***See Possible Plasma Panel defects for illustrations.
