Sanyo FVM3982 User manual

This guide is divided into 4 sections/pages depending on type of defect:
page 1)No Green LED Power Light.(LED never turns“ON”)
page 2)Green LED Light is “ON”, but Backlights are not “ON”,or only turn“ON & then OFF”.
page 3)Green LED Light is “ON”,and Backlights are “ON”,but there is no video/OSD.
page 4)Green LED Light turns “ON”, but turns “OFF”within 10 seconds.
Please select the section/page that matches your defect and follow the flow chart.
These models & chassis versions are in this guide:
P39842-00
P39842-01
PLEASE KEEP THIS GUIDE.
IT WILL NOT BE PROVIDED FOR EVERY REPAIR.
t[email protected]
SANYO
TROUBLESHOOTING GUIDE
2012 MODELS
P39842-00 / P39842-01
2012/04/02
2012-4A

Repair Flow Chart:Trouble Condition
Green Power LED does not turn on. The TV is dead.
Green Power LED:
Does not turn ON.
The TV is dead.
On analog signal board:
Is the “5VSTB” voltage supplied?
(see TABLE*1.0)
On digital signal board:
Is the “5V_STBY” voltage on
“K5A Pin 3 or Pin 4”?
Analog board is not working.
Replace “analog board”.
Unplug(CN2) connector on
power board. On Power board:
Is the “5VSTB” voltage supplied?
(see TABLE*2.0)
Power board is not working.
Replace “Power board”.
Unplug(K16A) and(K16B) connector
between digital unit and analog unit
Is the “5V_STBY” voltage supplied?
(see TABLE*3.0)
Analog board is not working.
Replace “analog board”.
Replace “digital board”.
While pushing the “power key sw”
is the 2.9V from “key sw2”
supplied to “K16A Pin17”?
Analog board was broken.
Replace “analog board”.
Digital board is not working.
Replace “digital board”.
No:0v
No:0v
Yes:5v
Yes:5v
No:0v
Yes:5v
Yes:5v
No:0v
Yes
No voltage(0v)at K16A Pin17 or 2.9V always present.
(see TABLE*4.0)
(see TABLE*5.0)
Page 1
(TABLE *1.0)Analog board:5VSTB Test Points
39" Models 5VSTB on Analog board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Analog K17 Pin4 or Pin5 5V
(TABLE *2.0) Power board:5VSTB Test Points
39" Models 5VSTB on Power board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Power CN2 Pin4 or Pin5 5V
(TABLE *3.0)Digital board:5V_STBY Test Points
39" Models 5V_STBY on Analog board Conrmation Voltage
P39842-00 Z6SE
PW39842-01 Z6SF
Analog K16A Pin3 or Pin4 5V

(TABLE *4.0)Digital board:5VSTB Test Points
39" Models 5VSTB on Digital board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Digital K5A Pin3 or Pin4 5V
(TABLE *5.0) Analog board: Key_SW2 Test Points
39" Models Key_SW2 on Analog board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Analog K16A Pin17 2.9V

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 (5V)
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 50V sine wave (RMS) supplied from “CN3Pin 1/2”
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:5V
Yes:3.3V
Yes:0V
No:over 0.1V
No:0V
Yes:+/-50V sine wave(RMS)
Page2
See TABLE *1.0
See TABLE *3.0
See TABLE *4.0
“ CN3
Pin 4/5”
See TABLE *2.0
and 50V sine wave (RMS) supplied
Page 2

(TABLE *1.0)Analog board: BL_SW Test Points
39" Models BL_SW on Analog board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Analog K17 Pin13 5V
(TABLE *2.0) Digital board: 3.3V Test Points
39" Models 3.3V on Digital board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Digital K5A Pin19 3.3V
(TABLE *3.0)Analog board: BL-SW Test Points
39" Models 0V on Power board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Power CN3 Pin10 0V
(TABLE *4.0) Power board: +/- 50V Sine wave (RMS)Test Points
39" Models +/- 50V Sine wave (RMS) on Power board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
+50V Power CN3 Pin1 or Pin2
-50V Power CN3 Pin4 or Pin5
+ 50V Sine wave (RMS)
- 50V Sine wave (RMS)

Repair Flow Chart:Trouble Condition
Green Power LED and LCD backlights are ON,but no video or OSD.
LCD backlights are ON,
but TV has NO VIDEO or OSD.
On analog board:
Is the 12V supplied from “K17 Pin 8/9”?
On digital board:
Is power 12V supllied from “K5A Pin2”?
Replace“Power board” and
“Wire harness”.
On digital board:
Is power 12V to TCON supplied
from“K5LV Pin29/33/37” ?
Analog board is not working.
Replace “analog board”.
Is LVDS clock outputed?
Confirm LVDS cable connection
and check for video OSD again.
T.Cnt.Board or LCD panel is not working.
1st:Replace“T.Cnt.Board&LVDS Cable”.
If T.Cnt.board&LVDS cable do not correct
problem,then 2nd:Replace“LCD Panel”.
Digital board is not working.
Replace “digital board”.
Digit board is not working.
Replace “digital board”.
If the clock output is OK,the digital board is
normally OK,but can not be 100% sure.If
the T Cont Board &LVDS do not the correct
problem,please try the digital before ordering
a panel.
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See TABLE *1.0
See TABLE *2.0
See TABLE *4.0
See TABLE *3.0
Page 3

(TABLE *1.0)Analog board: 12V Test Points
39" Models 12V on Analog board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Analog K17 Pin8 or Pin9 12V
(TABLE *2.0) Digital board: 12V Test Points
39" Models 12V on Digital board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Digital K5A Pin2 12V
(TABLE *3.0) Digital board: 12V Test Points
39" Models 12V on Digital board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Digital K5LV Pin29/33/37 12V
(TABLE*4.0)Main board:"LVDS Clock"Test Points
39" Models LVDS Clock on Digital board
P39842-00 Z6SE
P39842-01 Z6SF
K5LV Pin26 clock+
K5LV Pin28 clock-
Note:The bandwidth of the oscilloscope and probe must be at least 100MHZ or higher to check if the clock pulse exists.

Repair Flow Chart:Trouble Condition
Power LED turns OFF within 10 sec of power ON.
Power LED turns OFF within
10 sec of power ON.
On analog board:
Is 3.3V supplied to“K17 Pin1”during
LED ON time?
On digital board:
Is 3.3V supllied to “K5A Pin29”?
Unplug cable from digital board
to T.Cnt.board is symptom
changed?
Analog board is not working.
Replace “analog board”.
On power board:
Is the 12V supplied from “CN2 Pin8/9 ”
during LED ON time?
Digital board is not working.
Analog board may also not be working.
Replace “digital board and analog board”.
T Con board is not working.
Digital board may also not be working.
Replace “T Con board&digital board”.
Power board is not working.
Replace “Power board.”
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Digital board is not working.
Replace “digital board”.
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Page4
See TABLE *1.0
See TABLE *2.0
See TABLE *3.0
Page 4

(TABLE *1.0)Analog board: 3.3V Test Points
39" Models 3.3V on Analog board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Analog K17 Pin1 3.3V
(TABLE *2.0) Digital board: 3.3V Test Points
39" Models 3.3V on Digital board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Digital K5A Pin29 3.3V
(TABLE *3.0)Power board: 12V Test Points
39" Models 12V on Power board Conrmation Voltage
P39842-00 Z6SE
P39842-01 Z6SF
Power CN2 Pin8 or pin9 12V