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30" POWER SUPPLY
VOLTAGE DIAGRAM
(DC to AC
PCB
TROUBLESHOOTING DIAGRAM
No Power
- 30" LCD -
Power from
Power
Power
No
+24V/+12V/+18V in
Yes
from +24V/
from all inputs
110VAC input
+12V/+18V
No
No
C
Yes
B
Replace fuse and
Blown fuse
Yes
check BD801,
Q801, Q802, Q804
No
Rectyfying
Check BD801,
circuit/EMI filter
Yes
Q801, Q802, Q804
error
No
Problem lies
elsewhere
Directview LCD Training
De-Interlacer
Main
Microcontroller
Audio
TMDS
Amp
Receiver
Audio
Processor
18V
Power
Supply
Ballast
24V
Inverter)
Power
Power
Yes
Yes
from +18V
from +5VS
No
No
D
E
CIRCUIT DESCRIPTIONS
LCD Panel
LVDS Transmitter
(LCD Driver)
Scaler
(Format
Converter)
Analog/
5V
Digital
Converter
7V
Decoder
No power from
Drop of output
+24V/+12V/+18V in
B
power due to error of
110VAC input
the PFC circuit
Yes
Replace U901
(MC33368D) &
Error in peripheral
Yes
check/replace
parts
Q801
No power from
Output terminal
C
+24V/+12V/+18V
shorted
Yes
Check second
side parts for
pattern/output
terminal short
25
Video
Problem lies
No
T801 Error
No
elsewhere
Yes
No
Replace T803
#7 pin bias power
No
of U902 is abnormal
No
T803 Error
(normal: 15V-25V)
Yes
Yes
Check/replace
R941-R944, U902
Replace T803
(FAN7554), Q804
Circuit Descriptions
Problem lies
No
elsewhere
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Table of Contents
Troubleshooting
