Toshiba 50PH46P Service Manual page 25

2. Case Study
In many cases, color matching problems can be solved by returning the HIT and WID data for main deflection to the
initial adjustment values. Convergence cannot be re-adjusted in the following cases.
2-1 When the CRT has been replaced
Main deflection re-adjustment and color matching are necessary when the CRT has been replaced. Use the following
procedure.
1. Replace the blue and red CRTs.
2. Perform the blue and red yoke horizontal adjustments in relation to the green CRT. Press the yokes and speed
modulation coils + alignments onto the CRTs and fasten after making sure that there are no gaps.
3. Adjust the blue and red alignments (refer to the detailed alignment adjustment item).
4. Use centering magnets to center the blue and red CRTs in relation to the green CRT.
5. Adjust the main deflection HIT and WID data, using the most accurate location in relation to the green as data.
6. Use convergence to match the colors for each screen. Green will not work at this time.
7. When the convergence adjustments have been completed for all screens, then replace the green CRT.
Repeat the procedures in steps 2 - 5 for the green CRT but this time use convergence to match the colors using red and
blue as reference.
2-2 When none of the above cases apply (rare case)
An unexpected situation or major operational error, etc., could be considered but it is recommended that all screens be
matched starting from the beginning. If the initial positions of the centering magnets are unknown, disconnect the
connectors for the convergence sub-yoke outputs one at a time, adjust the CRT centering and then start the following
adjustments
1. Connect PAL signal.
2. Make sure that there is plenty of room for the static cross convergence to be moved left, right, up and down. If
sufficient space is not available, move to an appropriate location and then re-adjust the centering.
3. Enter the convergence adjustment mode and call out the menu.
4. Select 1. ADJUST PAL 100Hz WIDE and adjust the PAL mode Wide screen manually in accordance with the dimension
diagram.
5. When the PAL 100Hz WIDE screen adjustment has been completed, return to the Main Menu and select 2. PAL
Wide to others.
The screen will change automatically and all the other screens will be created automatically.
6. Next, select 3. ADJUST PAL 100Hz S.LIVE in accordance with the dimension diagram.
7. Next, select 4. ADJUST PAL 100Hz CINEMA and fine adjust to remove any Cinema screen distortion.
8. Next, select 5. ADJUST PAL 100Hz S.TITLE and fine adjust to remove any Subtitle screen distortion.
9. Next, select 6. ADJUST PAL Progressive and fine adjust to remove any PAL Progressive screen distortion.
10.Connect NTSC signal.
11.Next, select 7. ADJUST NTSC Progressive and fine adjust to remove any NTSC Progressive screen distortion.
All of the screens can be adjusted with the above process but make every effort not to change the factory data unless
absolutely necessary. Try not to change the convergence data any more than necessary.
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