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„ TV POWER ON SEQUENCE TEST :
Simplified Version
1. Verify Standby Light
If missing perform Standby Test / Function Test
9
2. Power TV On
Check Standby LED changes and TV Powers On
9
3. If Standby light won't change (turn off or flash)
Check with both Remote & Function Control Power command
9
Check Power On/Off changes from 0Vdc (off) to 3.3Vdc (on)
9
→
If OK Replace Main Board
4. If Standby LED Flashes and TV won't power on
→
Disconnect Panel Cables from Main Board
→
Power TV On
Check TV Powers On (Audio – No video)
9
→
If TV now Powers On
5. Verify Backlight Turns On
→
If No Backlight
→
Perform Backlight Test
Extended Version
1. Power TV On
Power On/off
(pin 8 ) .2Vdc (when off) changes to 3.3Vdc (on)
9
NOTE
•
There is a delay from PS-ON to off condition when the TV is powered off.
2. If voltage error or no change:
Check Jog Function Control Test
9
3. If OK replace Main Board.
Check All
A13V
supplies (12.7VDC) (pins 3
9
4. If any wrong voltages, remove SMPS connector to Main Board
Check
A13V
again (12.7VDC) (pins 3
9
→
If voltages are now OK replace the Main Board
→
If voltages are still wrong replace SMPS
5. Verify Backlight Turns On
•
If No Backlight
Check
PWM1/PWM2
9
backlight dimming level.
→
If missing/Error replace Main Board
→
If OK perform backlight test
5
(pins 4
6 ) Backlight On/Off & Dim Controls: for approx. 1Vdc – 2.5Vdc depending on
9 )
5
7
9 )
7
4. Troubleshooting
4-13
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