Sanyo DP32640 Service Manual page 3

Repair Flow Chart:Trouble Condition
Green Power is on,but LCD backlights are not on.
Backlights do not turn on, or only turn on and back off.
Yes:0V
Is the +20 sine wave supplied from"CN3 Pin 1/2/3"
and -20 sine wave supplied from"CN3
Yes:+/-20 sine wave(RMS)
Confirm wire harness connection
between analog board &Power board
and between Power board and panel .
Power LED turns ON,
but LCD backlight is not ON
or only turned ON and then
back OFF.
On analog signal board:
Is the "BL_SW" voltage (5V)
Supplied from "K17 Pin13"?
Yes:5V
On Power board:
Is the 0V supplied from "CN3 Pin10"
during LED on time?
On Power board:
Pin 4/5/6"?
Panel is not working
Replace panel.
No:0V
On digital board:
Is 3.3V supplied to"K5A Pin19" ?
Yes:3.3V
Replace "analog board and
wire harness".
No:over 0.1V
Panel is broken.
Replace "Panel".
No:0V
Power board is not working.
Replace "Power board".
No:0V
Digit board is not working.
Replace "digital board".
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