Fld Display Check - LG XC62-A0U Service Manual

5. FLD DISPLAY CHECK

FLD display check
YES
Check
P7904_PIN1, 2, 3 voltage
input.
YES
Check if both end votage
of F1, F2 are over 3.7V.
VKK : over 26V.
YES
Check WF31
connection and power.
Pin1 : FL-22 Pin2 : FL+26
Pin3 : VKK- over
26V.
YES
Check
IC301(PT6324) voltage.
Pin50 VKK : -26V
PIN9.52 : +5V
YES
IC100 - >
Check IC301
DATA communication.
PIN PIN
75PIN - > 3PIN STB
76PIN - > 2PIN D
78PIN - > 1PIN
CLK
YES
FLD light on?
YES
OK
LGE Internal Use Only
NO
Refer to SMPS
NO
Check WF31 connection.
Check each
PIN voltage.
OK
If voltage is not 5V,
check input and output
NO
of D301(1SR35).
Check IC301.
OK
IC100
75 PIN - > STB
NO
77 PIN - > 4PIN DI
78 PIN - > 1PIN CLK
Check data output.
76 PIN - > DO - - >
Check DATA in Check IC100.
Check IC100.
OK
3-7
YES
NO
YES
YES
NO
YES
YES
YES
NO
YES
Copyright © 2007 LG Electronics. Inc. All right reserved.
Replace WF31.
Replace IC301.
Replace IC100
Only for training and service purposes