LG LHB976 Service Manual page 124

MAIN SET TROUBLESHOOTING
1-7. NO HDMI INPUT
No HMDI audio / video output
YES
JK801,
JK802 pin18 Vcc 5 V
OK ?
YES
JK801,
JK802 pin19 HP_DET about 3.3V
OK?
YES
Is there
signal on JK801, JK802
pin15,16?
YES
JK803
pin18 Vcc 5 V
OK?
YES
JK803
pin19 HP_DET about 3.3 V
OK?
YES
Is there signal on
R841, R842?
YES
Is there signal on
X802?
YES
HDMI output OK.
NO
Check transmitter device.
NO
Check IC801 status.
NO
Replace IC801.
NO
Check L803 and Vcc 5 V line.
NO
Check hot plug detect signal from TV.
NO
Check IC801 Vcc or replace IC801.
NO
Check X802 or replace X802.
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