Fld Display Check - LG DM5360K Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. FLD DISPLAY CHECK

FLD DISPLAY
YES
Check
CON301 pin1 input
voltage 5 V.
YES
Check D304
input voltage 5 V?
YES
Check T301
pin6, 7 output voltage AC2.6 V.
Check D305 pin1 output
voltage -27 V.
YES
Check
IC301 voltage
pin30 VKK: -27 V
pin13, 43: 3.3 V.
YES
Check IC301
data communication
STB/ DATA/ CLK.
YES
FLD light on?
YES
OK
NO
Refer to SMPS/MPEG
troubleshooting.
NO
Check and change D304.
NO
Check and change
Q304, Q305, Q306, Q307.
NO
If voltage is not 3.3 V.
Check IC301.
OK
NO
Check input data
CON301 pin5, 6, 7.
Check output data
R308, R309, R310.
Check IC301.
OK
3-18
YES
NO
YES
NO
YES
YES
NO
YES
Replace IC301.
Refer to MPEG troubleshooting.
Replace IC301.