HP LT3200 - Manual (Page 88)

HP High-Definition LCD TV Service Manual 83
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?
o
Check the main board and panel cable connection.
o
Is the power on?
o
Is there battery in the remote control?
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?