SERVICE MODE
- Press {Mute} button once on the remote control.
- Press {Mute} button again on the remote control.
- While pressing 'Mute' button, press 'Menu' button on the TV panel.
- Press 'mute' button to select items to adjust.
KEY FUNCTIONS IN SERVICE MODE
- A single horizontal line On/Off. >> [-/--] button on the remote control or 'Power' button on the TV.
- Test signal selection. >> 'Power' button on the remote.
- Selection of adjustment items. >> Channel Up/Dn button on the remote.
- Change of the data value. >> Vol +/- button on the remote.
- Adjustment menu On/Off >> Menu button on the TV.
- Initialization of memory >> {Call + Channel Up button on the TV}
- Reset the count of operating protect unit to '00'. >> {Call + Channel Dn button on the TV}
- R-Cut selection >> 1 button
- G Cut selection >> 2 button
- B-Cut selection >> 3 button.
- CNTX selection >> 4 button
- COLC selection >> 5 button
- TNTC selection >> 6 button
- Test audio signal On/Off >> 8 button
- Self diagnostic display >> 9 button
SELF DIAGNOSTIC FUNCTION
- Press '9' button on the remote control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among ICs are executed properly.
- During diagnosis, the following displays are shown.
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<SELF CHECK>
2390****
POWER : 00
BUS LINE : OK
BUS CONT: OK
BLOCK : UV V1 V2
QV 01
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Explanations:
2390**** >>> Part number of the microcomputer.
Power: 00 >>> Operation number of protecting circuit. [..00] is normal. When indication other than "00" over current apts to flow, and circuit parts may possibly be damaged.
Bus Line Check >>> OK is normal.
'SDA-GND' = SDA-GND SHORT CIRCUIT.
SCL 1-GND = SCLPGND SHORT CIRCUIT.
SCL 1-SDA 1= SCL-SDA SHORT CIRCUIT.
Bus Cont >>> Ok is normal. When indication shows 'Q () () () NG", the device with the number may possibly be damaged.
Block >>> V1 = video 1 input mode
V2 = video 2 input mode
Indicated color of mode now selected: Green & Red.
Indicated color of other modes: White.
Green > Normal
Red: The microcomputer operates to provide judgement of no video signal. The red color is still indicated though the signal is input, failure may exist in input signal line, including QV 01.
QV 01: In case of indication green ---- Normal.
In case of indication red with input signal -----, failure may exist in output line including AV 01.
Note: Component which control character display on screen is QT-1. If this display function fails to operate due to the damage in QT-1, self diagnosis procedure are as follows.
- In case that power indicator is blinking with interval of 0.5 seconds; it means protecting circuit is operating, and the circuit components may possibly damaged. Check related components.
- In case that power indicator is blinking with interval of 'One' second, protecting circuit does not operate, but a part of BUS line does not operate normally. Check Bus Line.
DESIGN MODE
- Select Service Mode.
- While pressing "Call" button on the remote control, press 'Menu" button on TV.
- Press 'Menu' button once again.
When QA2 is initiated, items OPT0 and OPT1 of 'Design Mode' are set to data of the representative model of this chassis family.
Therefore, because On-Screen specification remains in the state of the representative model. This model is required to reset the data of items "OPT0 & OPT1"
ELECTRICAL ADJUSTMENT TABLE
Item
|
Adjustment procedure
|
Focus VR adjustment
|
|
Sub brightness [BRTC]
|
|
Horizontal position adjustment [HPOS] & Vertical
position adjustment [VPOS].
|
|
Vertical amplitude adjustment {HIT}
|
|
White balance adjustment.
Cutoff adjustment
Drive adjustment
|
|