LG MDS64V, Service Manual

Page: 19 / 59

3-4
7. FLD DISPLAY CHECK
NO
YES
YES
Refer to SMPS troubleshooting
Check if both end voltage of
F1,F2 are over 3.4V
VKK : over 26V
Check
CN104 pin1, 2, 3 voltage
input
FLD DISPLAY CHECK
YES
YES
YES
FLD light on?
YES
Check
CN304 connection
and power pin24:FL+26,
pin23:FL-22,
pin22:VKK over 26V,
pin19:+5.6V
Check
IC501(ET6315) voltage
pin30 VKK:-26V
pin13, 43:+5V
OK
OK
NO
Replace IC501
NO
If voltage is not 5V,
check input and output of L502
YES
Check IC501
Check CN304 connection
YES
YES
Check each pin voltage
OK
YES
NO
YES
YES
Check
IC102 --> IC501
data communication
3pin --> 9pin STB
2pin --> 7pin DATA
4pin --> 8pin CLK
OK
NO
Replace IC102
NO
IC102 : pin2,3,4
check data Input
YES
Check IC102
Pin2 data out
check data input
YES