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Troubleshooting
● No Picture
No pic ture with al l of
input sources
Check signal processing stage and LCD driving stage;
Check power supply circuit 17.5V, 3.3VPNL, 15.5VPNL and peripheral circuit.
Check IC401, IC4401, IC301, IC5201, IC5211, IC5212, IC5213, IC1401 and peripheral
circuits.
No picture with
HDMI (RGB digital)
input source
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Yes
Yes
No
No
Check following steps.
SG: Digital RGB signals from IC8001 are sent to IC301, and the other signals are
sent to IC301. They are scaled in IC301. After correcting for picture quality in
IC4401, IC5201 and IC401.
Sync: PW_ DHS,DVS,DCLK from IC301 to IC4401
No picture with
COMPONENT1/2 (YCbCr)
input sources
Check Component source input stage;
Check IC301 and peripheral circuit.
Yes
No
Component 1 : Y1_pin 210, CB1_pin 311, CR1_pin 209
Component 2 : Y2_pin 103, CB2_pin 212, CR1_pin 102
Check HDMI (RGB digital) source input stage;
Check IC8001 and peripheral circuit.
Check sync signals SIHS and SIVS.
Check 5VDDCH power supply line.
SG: TMDS data signals are converted to RGB digital signals in IC8001, and sent to
IC301.
Receiving video content encrypted with HDCP(High-bandwidth Digital
Content Protection), IC8001 reads the HDCP keys and it allows the signal
processing.
Sync: SIHS and SIVS signals from IC8001 are sent to IC301.
SG: Description of visual signal flow
Sync: Description of sync signal flow
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General
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