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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 15.5V and peripheral circuit.
Check IC501, IC531, IC561, IC401, IC4401, IC301 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
A/D converted in IC8201 and sent to IC301. They are scaled in IC301. After cor
-
recting for picture quality in IC4401 and IC401, they are sent to IC501, IC531,
IC561(sampling & holding, D/A conversion).
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 210/101, CB1_pin 311, CR1_pin 209
Component 2 : Y2_pin 211/103, 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 5VHDMI 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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