Panasonic PT- 56WX51CE, Service Manual

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Service Manual
PTV Screen Assemblies
Figure 21. Screen Assemblies.
Dynamic Focus Adjustments
1. Focus adjustments should be performed after 1
hour of aging.
2. Use oscilloscope with 100 : 1 probe.
3. Apply monoscope pattern.
4. Adjust the red, blue and green focus VR on the
focus block for best focus of overall picture of each
CRT.
Figure 22. D. Focus Adjustment Waveform
5. To change DAF DATA, enter to service mode, then
press POWER on remote to display DACs menu,
then select DAC by pressing CH (RIGHT/LEFT)
and VOL (UP/DOWN), then press ACTION to enter
to DAC, then adjust by pressing VOL (RIGHT/
LEFT); press ACTION, to save press ACTION
again or OTHER to exit without saving.
Procedure:
1. Enter to Service mode and set the following default
DATA:
• H-PAR to +317
• V-SAW to -23
• V-PAR to +69
2. Connect the scope probe to TPD30, GND to
TPD31.
3. Confirm that level of A is 600_V ± 100_V, adjust H-
PAR DAC to set to specification level.
4. Confirm that level of B is 280_V ± 50_V, adjust V-
PAR DAC to set to specification level.
5. Confirm that level of C is more tha 20 V, adjust H-
PAR DAC to set to specification level.
Confirm that the waveform shown in D appears (See
Fig. 22)
FRONT
REAR
Protective Screen
Fresnel Screen
Lenticular Screen
Front Cabinet
(note vertical ridges)
(note circular ridges)
Label on
lower left corner
(rear side)
Label on
lower left corner
(front side)
Labels on
opposite sides
A
B
16.7ms (V Rate)
600_V ± 100_V
280_V ± 100_V
GND
C
> 20_V