LG MG120a Service Manual page 36

4. TROUBLE SHOOTING
(1) Checking Regulator Circuit
TEST POINT
U101. 3 U101 U101. 5
(EN) (OUT)
CHECKING FLOW
Voltage at Level at NO
NO
Change main board
Pin5 of U101 Pin3 of U101
Is 2.85V? Is high?
YES YES
Regulator Circuit is OK
Replace U101
See next Page to check
VCTCXO
-36-