No Video_Hdmi1, 2, 3, 4 - Digital Signal (X4) - Samsung LA22C450E1 Service Manual

4-1-3. No video_HDMI1, 2, 3, 4 - Digital signal (X4)

Symptom Audio is normal but no picture is displayed on the screen.
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Check the HDMI source.
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Major
Check the HDMI switch, Check the Chelsea.
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checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the HDMI source and
check the connection of HDMI cable ?
Yes
Does the signal appear at CN1302 (Pin#12,
#7) (HDMI1) CN1303_H2 (Pin#12, #7)
(HDMI2) CN1301_550 (Pin#12, #7)
(HDMI3) CN1304_SH (Pin#12, #7) (HDMI4)
(HDMI RX_Clk , RX_Data) ?
Yes
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK-,
O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the HDMI signal properly.
Check CN1302, CN1303_H2,
CN1301_550, CN1304_SH.
No
Check HDMI cable.
Change the Main Assy.
Check IC3002 (X4).
No
Change the Main Assy.
No Please, Contact Tech support.
4. Troubleshooting
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