LG LH-CX640 Series Service Manual page 43

3-33 3-34
NOTES) Symbol denotes AC ground.
NOTES)
Symbol denotes DC chassis ground.
NOTE) Warning
NOTE)
Parts that are shaded are critical
NOTE)
With respect to risk of fire or
NOTE)
electricial shock.
A B C D
E
F G H I
J
K L M N
O P Q
R
ST
2.
POWER(SMPS)
CIRCUIT DIAGRAM 1_400W
Switching
Error.
IC101 is defective.
Switching Error.
IC104 is defective.
Switching Error.
IC105,
106 are defective.
No Power.
F101 is defective.
No
5.3VA.
D127 is defective.
No
3.8VA.
D127 is defective.
No 13VA.
D126 is defective.
No
33VA.
D125 is defective.
No
32VA.
D122 is defective.
Digitron
Error.
D123,
ZD121,
D124
are defective.
No power.
BD101, TH101 are defective.
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS
CHASSIS,
UNDER NO CIR-
CUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG ELECTRONICS CORPORATION. ALL
COMPONENTS SHOULD
BE
REPLACED ONLY
WITH
TYPES
IDENTICAL
TO
THOSE
IN
THE
ORIGINAL CIR-
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE
SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF-
FER FROM THE ACTUAL CIRCUIT USED. THIS
WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET
IS NOT DELAYED UNTIL
THE
NEW SERVICE
LITERATURE IS
PRINTED.
NOTE :
1. Shaded(
) parts
are critical for safety.
Replace only
with specified
part
number.
2.
Voltages
are DC-measured with a digital voltmeter
during Play
mode.