LG T910B Service Manual page 28

Input full white pattern to monitor.
input exists and varies
When adjust ABL?
Q787 C Voltage,
IC302 22 Pin Voltage varies?
Check IC302
IC401 Pin 24(4.6V DC)
output are right?
Check FBT DF Voltage
14
Check the connection between
CRT Socket PCB.
Waveforms
14
FBT, FO
14. ABL Failure
IC401 Pin5
YES
varies.
YES
15. Focus Failure
YES
YES
FBT and,
NO
NO
NO
NO
NO
- 28 -
Check and replace IC401
Check Q787 and around
Check 15V Line
Check D801 R803
Check and replace IC401.
Check FBT and around component