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8．Abnormal signal from other interfaces
HDMI: no signal
AV/S-VIDEO/YpbPr: No signal
Confirm if there is signal input
Confirm U23(CX32)
1． Power supply works
2． Crystal works
3． Re-position all right
4． Time and steps of electrifying
Check the electrocircuit of the input signal
Check antenna input
Check U11(9011)
1． Power supply works
2． Crystal works
3． Re-position all right
Check the connected cable
Check the state of the chip on the connected board
Check
RN2/RN3/RN5/RN6/RN7/RN8
Check RN4
HDMI no sound
Confirm 24C02 DDC recorded
检查 U15(4334)工作正常
检查 U15(4344)外围电路
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