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4-15
4. Troubleshooting
4-1-2. No Video_Analog PC signal (X4)
Symptom
Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the PC source
-
Check the Arsenal, Check the Chelsea.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Does the signal appear at
TP - PC_R, PC_G, PC_B, PC_HS, PC_VS
(R, G, B, H, V) ?
Does the digital data appear at
TP-, E_TXCLK-,
, O_TXCLK- ?
Yes
Yes
Yes
Yes
Check a set in the 'Stand-by mode'.
or 'DPMS mode'.
Input the analog PC signal properly.
Please, Contact Tech support.
Check CN901, PC cable.
Change the Main Assy
Check IC3002 (X4).
Change the Main Assy.
No
No
No
No
No
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the PC source and
check the connection of D-SUB ?
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LA22C450E1
Page 34: ...1 4 1 Precautions Memo ...
Page 51: ...4 4 4 Troubleshooting WAVEFORMS 12 PC input V sink H sink R G B 3 LVDS output ...
Page 53: ...4 6 4 Troubleshooting WAVEFORMS 1 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 55: ...4 8 4 Troubleshooting WAVEFORMS 1 CVBS OUT Grey Bar 2 LVDS output ...
Page 57: ...4 10 4 Troubleshooting WAVEFORMS 1 LVDS output ...
Page 59: ...4 12 4 Troubleshooting WAVEFORMS 1 I2S Data 2 Speaker out ...
Page 63: ...4 16 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 65: ...4 18 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 67: ...4 20 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 69: ...4 22 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 71: ...4 24 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 73: ...4 26 4 Troubleshooting WAVEFORMS 7 Speaker out ...