Sub Contrast / G-Limit Adjustment; Sub Picture Contrast Adjustment - Panasonic TX-47P500HM Service Manual

9.3.

Sub Contrast / G-Limit Adjustment

Preparation
Picture Menu : Dynamic
C Temp : Standard High-RGB : 128
AI : ON Low-RGB : 640
P-NR : ON G-Limit : 255
Scan Mode : 100Hz (PAL)
Cut off Adjustment has been adjusted
Adjustment
1. Receive a Cross Hatch pattern.
2. Connect an oscilloscope to TPLG1 on LG-Board.
3. Adjust Sub Contrast so that the waveform A is 150 ± 2V.
4. Before G-Limit Adjustment is attempted, Sub Contrast adjustment must be completed.
5. Adjust G-Limit so that the waveform A is 125 ± 2V.
9.4.

Sub Picture Contrast Adjustment

Preparation
Picture Menu : Dynamic
AI : ON
Adjustment
1. Receive a Colour Bar pattern.
2. Connect an oscilloscope to TPLG1 on LG-Board.
3. Increment / Decrement Video gain2 to adjust Sub-Video level B as same as Main video level A.
WB-B-G-ST1 : 255
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TX-47P500HM / TX-47P500HQ / TX-47P500HZ / TX-47P500X