Fld Display Check - LG MBD-K62Q Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

4. FLD DISPLAY CHECK

FLD display check
YES
Check P7904
1,2,3 power.
YES
F1+,F2- both
terminals: over 3.7V
Check power VKK: over -28V.
YES
Check
P7302 connection
condition and power F1+,
F2- both terminals: over 3.7V
Check power VKK: over
-28V Check 24
PIN:5.6V
YES
Check IC301
PT6324 power
50PIN VKK: -28V
9.51PIN +5V
YES
Check IC100
--> IC301 DATA
communication
PIN PIN
75PIN-->3PIN STB
76PIN-->2PIN DO
78PIN-->1PIN
CLK
YES
FLD light on?
YES
OK
NO
Refer to SMPS
Troubleshooting
NO
Check P7302 assembly
Check power
of each PIN
OK
When 5V fails, check
NO
D301SR35 input and
output power
Check the
related part
OK
IC100
NO
75PIN - > STB
78PIN - > 1PIN CLK
Check Data output.
76PIN--> DO
--> DATA input
Check the
related part
OK
3-4
YES
NO
YES
YES
NO
YES
YES
YES
NO
YES
Replace the related part
Replace the related part
Replace the related part