Service Modes, Error Codes, and Fault Finding
5.
5.6
Fault Finding and Repair Tips
5.6.1
Fault Finding Flow Charts
Figure 5-2 No picture, no sound, no backlight. Fuse broken.
Figure 5-3 No picture. Backlight and sound okay.
1
8
520_204_090
3
1
3
.ep
s
090
3
1
3
No Picture, no sound, no Back light, Fuse Broken
For P22,pin10 is
3.3V , OK?
For P22,pin1 is
24V , OK?
Check IPB
For P22 ,Pin 7~8
is 3.3V, OK?
Check Q10,
X5,IR_MCU,KEY,
MCU_RESET,U8.
Check main
board DV10
&+3.3V OK?
NO
NO
NO
YES
YES
YES
Check main board
DDRV & AV12, OK?
YES
Check main board
short_protect ,
oreset#,pwr_detect
YES
Check IPB
1
8
520_205_090
3
1
3
.ep
s
090
3
1
3
No Picture, Back light & Sound OK
Check the 5V-IF
voltage of . is it
OK?
Check 33V is
OK?
Check the
voltage
of R48,U6
Yes
No
Yes
Is
Q14,C184,C197
,L54 shorted to
earth?
Replace R48
&
U6
Yes
No
check the
U2,Q13
check
D2,R184,R178
No
