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In regard to the self-check function
When phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at the
time of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits.
Also, when "the power fails from time to time", display of the color bar on the screen can be used confirm the occurrence and to
limit the scope for the defective circuits.
Display method and display position
Display method
When display is desired
Hold [
] (OFF TIMER) on the
remote control pressed and
press [VOL -] on the TV set.
(The reception screen switches
to TV monitor, and a screen as
shown on the right appears.)
To return to normal display
When one of the buttons for
channel selection etc. is
operated, the display returns to
the normal screen.
Display phenomenon and treatment method
Display
symbol
H10
No output of video and audio.
H21
Audio stop. Surround function not effective.
H30
No video and audio. Surround function not effective.
H34
No video. No raster. Color stop. No color synchronization.
Wrong colors. Bad on-screen display. No horizontal/vertical
synchronization.
H36
No video. Color stop. Wrong colors. Bad on-screen display.
No horizontal/vertical synchronization.
H55
The red bar is displayed momentarily and then the power is
interrupted. The power signal lamp (red) flashes three
times in intervals of 2.8 sec.
H56
The yellow bar is displayed for 0.5 sec., and then the power
is interrupted. The power signal lamp (red) flashes twice in
intervals of 3.3 sec.
H57
The green bar is displayed for 1 sec., and then the power is
interrupted. The power signal lamp (red) flashes once in
intervals of 3.8 sec.
H58
Abnormal power circuit. The power does not come up, and
it is switched off after a few seconds.
H90
The memory gets lost.
H91
One horizontal line is not obtained at the time of servicing.
H99
"No video from time to time" because of causes in the
antenna~tuner~video circuit.
*This also may be displayed when the antenna plug is dis-
connected or when a channel without a signal is received.
Operation part on the main unit
[VOL -]
Press simultaneously.
Panas
1
2
[OFF TIMER]
Operation panel in
the remote control
Phenomenon, condition
Display position
H10 UV
H30 AVSW
H36 IC301
H91
IOA
H57
H56
H58
Magenta Green Yellow
Exchange the tuner (TNR001).
Inspect the main board [A] IC2401 (audio compen-
sation).
Inspect the rear terminal switching board [H]
IC3001.
Inspect the digital core board [DG] IC6601.
Inspect the video signal processing board [AG]
IC301.
Detection of overcurrent (140V line), vertical out-
put.
Detection of 25 V line overcurrent, 25V line.
"Power failure from time to time" because of the
overcurrent (140V line), vertical output (+15V line).
"Power failure from time to time" because of the
overcurrent (140V line), vertical output (+15V line).
Inspect the main 5V line.
Exchange the main board [A] IC1114 (memory).
Inspect the main board [A] IC1201 (expansion
DAC).
Inspect the tuner~video circuit.
- 5 -
OK
H21
OK
OK
H34 DG
OK
OK
H90
OK
OK
H55
H99
Red
Blue
Display at the time of a fault
Treatment method
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