2.2 Fault flow chart
Fault symptom:
Cannot switch on:
No picture
No backlight
Possible causes:
PCB14, Main
PCB11, IR Receiver
PCB04, Power Supply
LCD panel
Check voltage on
PCB14, Main on J16
pin 3 5V (LED1)
OK?
Confirm mains on
CN1 on PCB04,
Power Supply
OK?
Check voltage on
PCB14, Main J1
pin 9 +5V
OK?
Check fuse on
Power Supply F1.
Replace fuse if
defective.
Check +5V.
OK?
Replace PCB14,
Main
Replace PCB11,
IR Receiver
Confirm voltage on
PCB14, Main J1
pin 13 +5V
(PWRON) may
toggle between 0
and 5V while
pressing TV on the
remote control once
OK?
Press TV on remote
control and look at
the stby. light.
Does the stby. light
turn off?
Confirm voltages on
PCB14, Main: J1 pin
1, 2, 3, 4, 5 = 12V
J1 pin 15 = -12V
and on PCB04,
Power Supply:
CN202 pin 1 = 24V
All OK?
Replace PCB04,
Power Supply
Check backlight
ON?
Confirm voltages on
PCB04, Power
Supply:
CN203 pin 11 =
3.3V
OK?
Confirm voltages on
PCB14, Main J1
pin 11 = 3.3V
OK?
Confirm voltages on
PCB04, Power Supply
CN202:
pin 1-5 = 24V
pin 6-10 = GND
pin 11 = 3.3V
All OK?
Replace PCB04,
Power Supply
Measure with an
AC voltmeter on
PCB14, J16 pin 5 =
1.6Vac (±0.8) while
pressing MENU on
the remote control
OK?
Replace PCB11,
IR Receiver
Replace PCB14,
Main
Replace PCB14,
Main
Check cable
connection
between PCB04,
Power Supply and
PCB14, Main
Re-connect mains
No
Yes
Confirm red light in
stby. LED
OK?
Check cable
connection
between PCB04,
Power Supply,
PCB12, Filter and
LCD panel
Replace LCD panel
Replace PCB04,
Power Supply
Summary of Contents for BeoVision 10-40
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