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HP LT3700 Service Manual: No Power; No Video; Keypad Abnormal; Led Display Abnormal

Lcd high-definition television.
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Troubleshooting Tips

No Power

Check the power supply unit (PSU) – Is the PSU board defective?
Is the power cord connector grounded?
Check the cable between the PSU board and the main board.
Is the keypad/remote control power button working?
Is the power connector connected?
No Video
Is there an input source connected?
Is the LED on?
Check the main board and panel cable connection.
o
Is the power on?
o
Is there battery in the remote control?
o
Keypad abnormal
Is the button working properly?
Check whether the LED is on.
Check module.
Check the cable and main board connection.
LED Display abnormal
If the LED is off/dark/abnormal – check main board or cable.
If the LED flickers – Power saving mode in VGA: push any key to restart.
Abnormal Display
Missing Line:
1. Check the cable between the main board and the control board
2. Check the panel board
Bright Dot/Dark Dot/Light Leakage/Mura (cloudiness)/Image Sticking/Brightness spot/Particles/Dot Defect –
Check panel
No Display – Check the main board, inverter board, and panel board.
Display Noise:
1. Check the cable between the main board and the control board.
2. Check the panel board.
Flicker/Image too dark – Check main board or inverter board, load default settings.
Gray value display – Check main board or panel cable, load default settings.
VGA no image – Check main board or D-sub cable: is NB switch to LCD monitor?
HP High-Definition LCD TV Service Manual
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Troubleshooting

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Lt3200, Lt4200, Lt4700

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