2-8
2-9
CIRCUIT DIAGRAMS
1. SMPS(POWER) CIRCUIT DIAGRAM
A
1
2
3
4
5
6
7
8
9
10
11
12
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
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.
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIR-
CUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES IDENTI-
CAL TO THOSE IN THE ORIGINAL CIRCUIT. 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.
Summary of Contents for HT552TH
Page 23: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW 2 26 2 27 ...
Page 24: ...2 28 2 29 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...
Page 26: ...2 32 2 33 4 KEY P C BOARD 5 TIMER P C BOARD ...
Page 27: ...2 34 2 35 6 USB P C BOARD ...
Page 53: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 AMP P C BOARD DIAGRAM_TOP VIEW 3 28 3 29 ...
Page 54: ...3 30 3 31 2 AMP P C BOARD DIAGRAM_BOTTOM VIEW ...
Page 57: ......
Page 59: ......
