Adjustment Procedures (Display) - Sharp LC-30HV4E Service Manual

ADJUSTMENT PROCEDURES (DISPLAY)

See "Adjusting mode" for the steps to go into adjustment process mode.
NOTE: When IC2203 is replaced, it is needed to Initialization first then Background adjustment and Common bias
adjustment.
1) +B adjustment (Digital PWB: R4648)
1. Receive PAL standard color bar signal.
2. Connect digital voltmeter to TP4602 and adjust to the specified value.
Specification: 13.00 ± 0.05V
2) Common bias adjustment
Make this adjustment each for "50 Hz", "60 Hz" and "PC". Select the input signal according to the indication onscreen.
1. Go to "Adjustment process mode".
2. On the LCD, select "14" of "PATTERN 1", dot inversion flicker pattern 2.
3. Then, select "COM BIAS" on the LCD.
4. Set the value so that the flicker on the screen is minimized.
Note: Apply this adjustment after for at least 30 min.
3) Background adjustment
1. Select video standard, and confirm the indication that the unit is preset to the standard.
2. At video input, receive the window pattern signal having left 80% WHITE and right 20% WHITE.
3. Set the screen size to the full mode.
4. Go to "Adjustment process mode".
5. Adjust "R OFFSET", "G OFFSET" and "B OFFSET" in "SIL861" so that left side 80% WHITE window pattern is
set to the specified value.
6. Adjust "R GAMMA", "G GAMMA" and "B GAMMA" in "SIL861" so that right side 20% WHITE window pattern is
set to the specified value.
Specification: x = 0.275 y = 0.273 (80% WHITE) x= 0.269 y = 0.253 (20% WHITE) [Minolta CA-110]
Note: Apply this adjustment after for at least 30 min.
4) Initialization
1. Go to "Adjustment process mode".
2. Select "1" thru "3" of "CLR MODE" in "TEST".
Setting range: 0 Normal
1 Initial setting (User clear: Factory setting)
2 Initial setting (All clear) Full initialization of EEPROM (except for ROM area)
3 Full initialization of Configuration EEPROM
3. Move the cursor down by one line.
4. Press "VOL UP" key and change the display from "WAIT" to "SEND" (write).
5. Do not shut down power while the display is "SEND".
6. When the writing is finished, the display changes from "SEND" to "WAIT".
5) Resetting lamp error counter
1. Go to "Adjustment process mode".
2. Select "L ERR RESET" in "TEST".
3. Reset the data to "0".
[L ERR RESET]
Function: Reset of fluorescent lamp error counter
It resets the times of fluorescent lamp errors and clears the last value in the memory.
Indication range: 0-5 (Fluorescent lamp errors)
(When lamp error exceeds 5 times, power supply is disabled. Resetting is required in this case.)
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LC-30HV4E