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.
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 (3
．
3V)
Supplied from “K17 Pin13”?
On Power board:
Is the 0V supplied from “CN3 Pin10”
during LED on time?
Panel is broken.
Replace “Panel”.
On digital board:
Is 3.3V supplied to”K5A Pin19” ?
Digit board is not working.
Replace “digital board”.
On Power board:
Is the +20sine wave (RMS) supplied from “CN3 Pin 1/2/3”
Power board is not working.
Replace “Power board”.
Confirm wire harness connection
between analog board &Power board
and between Power board and panel .
Panel is not working
Replace panel.
Replace “analog board and
wire harness”.
No:0V
No:0V
Yes:3.3V
Yes:3.3V
Yes:0V
No:over 0.1V
No:0V
Yes:+/-20 sine wave(RMS)
Page 2
See TABLE *1.0
“CN3 Pin 4/5/6”
and -20 sine wave (RMS) supplied
Page 2
(TABLE *1.0)Analog board: 3.3V Test Points
42" /46"Models
3.3V on Analog board
Confirmation Voltage
P46841-03 Z5WP
P42841-05 Z5VT
P42841-06 Z5VV
Analog k17 Pin13
3.3V
