Circuit Diagrams; Power(Smps) Circuit Diagram - Zenith XBR411 Manual

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM

No Power
BD101, TH01 is Defective
S/W Error
IC101,IC104 is Defective
No Power
F101 is Defective
NOTE)
NOTES) Symbol denotes AC ground.
NOTE)
NOTE)
NOTES) Symbol denotes DC chassis ground.
NOTE)
-29VA No Power
D127 is Defective
No Power
D102 is Defective
5. 3VA No Power
D121 is Defective
30VA No Power
D130 is Defective
Switching Error
IC105,IC106 are Defective
No Power
D104 is Defective
3. 3V No Power
D122 is Defective
Switching Error
IC105, IC106 are Defective
Warning
Parts that are shaded are critical
With respect to risk of fire or
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 ELECTRONICS CORPORATION. ALL
COMPONENTS SHOULD BE REPLACED ONLY WITH
TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-
No Digitron Displayed
D128,R107,ZD151 are Defective
12V No Power
D126 is Defective
28V No Power
D129 is Defective
12V No Power
D125 is Defective
5V No Power
D124 is Defective
5V No Power
1.8V No Power
IC151 is Defective
D123 is Defective
3.3V No Power
IC154 is Defective
3-34 3-35
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE NOTE :
SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF- with specified part number.
FER FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter
IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode.
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.
28V No Power
Q120 or ZD153 are Defective
12V No Power
Q125 or ZD152 are Defective
12V No Power
IC157 is Defective
2. 5V No Power
IC152 is Defective
1.8V No Power
IC160 is Defective