Panasonic TX-29P90T Service Manual ▷ View online
10. Tighten the clamp screw.
5.9. CONVERGENCE
1. Apply a crosshatch pattern signal and set Contrast control
to the maximum position.
2. Adjust Bright control to obtain a clear pattern.
3. Adjust Red and Blue line at center of the screen.
Preparation
1. Receive a colour bar signal with colour “OFF”, and operate
the TV set for more than 30 minutes.
2. Set the picture menu to “DYNAMIC NORMAL” and the AI to
off.
3. Connect an oscilloscope to TPL7 with DC mode.
4. Set the TV set to Market Mode : white balance adjustment
(CHK 3).
5. Screen VR : Min.
6. Set the data level of RGB CUT OFF / DRIVE and SUB
BRIGHT.
Display
Data Level
R-CUT OFF
63
G-CUT OFF
128
B-CUT OFF
63
R-DRIVE
128
B-DRIVE
128
SUB BRIGHT
63
Adjustment of Low Light
1. Adjustment Sub Bright, so that Y = 6.3 ± 1.0 nit.
2. Adjustment R-CUT OFF, so that X = 0.243 ± 0.010 nit.
3. Adjustment G-CUT OFF, so that Y = 0.255 ± 0.010 nit.
4. Adjust Red and Blue with Green line at center of the screen
by rotating (RB)-G static convergence magnet.
5. Lock convergence magnets with silicone sealer.
6. Remove the DY wedges and slightly tilt the Deflection Yoke
vertically.
7. Fix the Deflection Yoke by re-inserting the DY wedges.
8. If purity error is found, repeat “Colour Purity” adjustment.
Adjustment of Low Light
1. Adjustment Sub Bright, so that Y = 150 nit.
2. Adjustment R-Drive, so that X = 0.260 ± 0.010 nit.
3. Adjustment B-Drive, so that Y = 0.265 ± 0.010 nit.
Adjustment
1. Select G-CUTOFF adjustment mode and collapse vertical
scan.
2. Adjust G-CUTOFF control to become the DC=0 V to video
level at 180 V as shown in Fig. 1.
Fig. 1
3. Slowly turn the screen control clockwise until a green colour
horizontal line appears on the picture tube. This is the
setting point for the screen control.
Note:
setting point for the screen control.
Note:
Do not adjust the G-CUTOFF setting in the following
procedure.
procedure.
5.10. WHITE BALANCE (MARKET MODE CHK 3)
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TX-29P90T
4. Adjust the remaining R and B-CUTOFF controls so as to
get a white horizontal line on the screen.
5. Return to full field SCAN by pushing the position 5 key on
the remote control.
6. Adjust the R-Drive and B-Drive controls as to obtain a
uniform white on the white bar of the greyscale pattern.
7. Confirm correct B/W rendition and greyscale tracking or
repeat CUTOFF and drive control setup.
Note:
Write down the original value for each address adjustment
before adjusting anything.
Write down the original value for each address adjustment
before adjusting anything.
Fig. 2
8. Wedge A shown in Fig. 2 should be fixed within a range of
45° to the left of the vertical line as shown.
9. After inserting wedge A, insert wedges B, C and D.
The wedges should be set 90° apart from each other.
10. Be certain that the four wedges are firmly fixed and the
Deflection Yoke is tightly clamped in place otherwise the
Deflection Yoke may shift its position and cause a loss of
convergence and purity.
Deflection Yoke may shift its position and cause a loss of
convergence and purity.
10
TX-29P90T
6 Conductor Views
6.1. A-Board 1/2
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TX-29P90T
6.2. A-Board 2/2
12
TX-29P90T
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