Fld Display Check - LG CM2460 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. FLD DISPLAY CHECK

FLD DISPLAY CHECK
YES
Check
PN100 pin1 input
voltage 5 V.
YES
Check D301
input votltage 5 V?
YES
Check T300
pin6, 7 Output votltage AC 2.6 V.
Check D302 pin1 Output
votltage -27 V.
YES
Check
IC300(PT6315) voltage
pin30 VKK: -27 V
pin13, 43: 3.3 V.
YES
Check IC300
data communication
STB/DATA/CLK.
YES
FLD light on?
YES
OK
NO
Refer to SMPS/MPEG
troubleshooting.
NO
Check and change D301.
NO
Check and change
Q301, Q303, Q305, Q306.
NO
If voltage is not 3.3 V.
Check IC300.
OK
NO
Check input data
PN100 pin6, 7, 8.
Check output data R305, R304,
R303.
Check IC300.
OK
3-20
YES
NO
YES
NO
YES
YES
NO
YES
Replace IC300.
Refer to MPEG troubleshooting.
Replace IC300.