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01/04/11
2010-4A

SANYO
TROUBLESHOOTING GUIDE
2010 MODELS
DP42840 / DP46840 / DP52440
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, or LED cycles
ON & OFF.

Please select the section/page that matches your defect and follow the flow chart.

These models & chassis versions are in this guide:

DP42840-00
DP42840-01
DP42840-02
DP42840-03
DP42840-04
DP42840-07

DP46840-00
DP46840-01
DP46840-02
DP46840-03

DP52440-00
DP52440-01
DP52440-02

PLEASE KEEP THIS GUIDE.
IT WILL NOT BE PROVIDED FOR EVERY REPAIR.

[email protected]
Repair Flow Chart: Trouble Condition page 1

Green Power LED does NOT turn on. The TV is dead.
Green Power LED:
Does not turn ON.
The TV is dead.

On Main Signal Bd.:
Is the "5V_STBY" voltage
no: 0V
supplied?
(see TABLE *1.0)

no: 0V
Unplug (K8B) connector on Main Bd.
Power Bd. is not working.
On Power Bd.: Is the "5V_STBY"voltage supplied?
(see TABLE *2.0)
Replace "Power Bd."

yes: 5V

yes: 5V

Replace "Main Bd."
and "Wiring Harness"

Confirm wire harness connection
between Main Bd. & Power Bd.,
and confirm LED again.

On Main Signal Bd.: no: 0V
Is the "5V_STBY" voltage
on "K8CTR pin 1" ?

Main Bd. is not working.
yes: 5V Replace "Main Bd".

While pushing the
"Power Key SW": is the 4.6V from No voltage (0V) at K8CTR pin 3, or 4.6V always present.
"KEY SW" supplied to "K8CTR
pin 3"?

Key Switch Assy. unit will be broken.
yes Replace "Key Switch Assy."

Main Bd. is not working.
Replace "Main Bd"

(TABLE *1.0) Main Bd.: 5V_STBY Test Points
42" Models 46" Models 52" Models 5V_STBY on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 3" 5V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *2.0) Power Bd.: 5V_STBY Test Points
42" Models 46" Models 52" Models 5V_STBY on Power Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK Power K6B "pin 3" 5V
DP42840-01 N7AM DP46840-03 N7EKE
DP42840-07 N7AS
DP42840-02 N7AFF DP46840-01 N7EEE DP52440-00 N7KF Power CN2 "pin 3" 5V
DP42840-03 N7AHE DP46840-02 N7EGE DP52440-01 N7KFE
DP42840-04 N7AJE DP52440-02 N7KFF
Repair Flow Chart: Trouble Condition page 2

Green Power LED 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.

Is the 12V supplied from
Power Bd.? no: 0V
(see TABLE*1.0)

On Main Bd.
Is 5V supplied to "Power ON/OFF SW" no: 0V Main Bd. is not working.
(see TABLE*2.0) Replace "Main Bd."

yes:12V
yes: 5V
Replace: "Power Bd."
and "Wire Harness"

Is the 15/16/24V (if applicable) supplied no: 0V
from Power Bd. during LED ON time?
(see TABLE*1.1)

Unplug the cable from Power Bd. to Inverter
yes: 15/16/24V
Inverter Bd. is not
Bd..
working. Replace
Is the 15/16/24V supplied from Power Bd.
"Inverter Bd.".
yes:15/16/24V during LED on time?
or
(not applicable)

no: 0V

Power Bd. is not working.
Replace "Power Bd.".
On Main Bd.:
Is the "BL_ON" voltage (3.3V) no: 0V
supplied from Main Bd.?
(see TABLE*3.0)

Main Bd. is not working.
Replace "Main Bd."
yes: 3.3V

Confirm wire harness connection between Main Bd.
& Power Bd., and between Power Bd. and Inverter
Bd. note #1
Only on the DP52440, please order the SMPS in addition to the Inverter. This
SMPS has a HV transformer that may not be working. Change the SMPS first, if
Inverter Bd. or LCD Panel is not working. that does not fix the no BL problem, then change the Inverter.
1st: Replace "Inverter Bd."
If Inverter Bd. does not correct problem, then:
2nd: Replace "LCD Panel"

(TABLE *1.0) 12V Test Points
42" Models 46" Models 52" Models 12V on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 8" 12 V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *1.1) 15 / 16 / 24V Test Points
42" Models 46" Models 52" Models 15 / 16 / 24V on Power Bd Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK Power K605 "pin 1" 24 V
DP42840-01 N7AM DP46840-03 N7EKE
DP42840-07 N7AS
DP42840-03 N7AHE Power CN4 "pin 1" 24 V
DP42840-04 N7AJE
DP42840-02 N7AFF DP46840-01 N7EEE DP52440-00 N7KF Power CN2 "pin 12" 42" & 46" = 16V , 52=15 V
DP46840-02 N7EGE DP52440-01 N7KFE
DP52440-02 N7KFF

(TABLE *2.0) Main Bd.: "Power ON/OFF SW" Test Points
42" Models 46" Models 52" Models 12V on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 1" 5V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *3.0) Main Bd.: "BL_ON" Test Points
42" Models 46" Models 52" Models BL_ON Command - Main Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8L "pin 3" 2.3 - 3.3 V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS
Repair Flow Chart: Trouble Condition page 3

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 Main Bd.:
Is the 12V supplied
no: 0V
from Pwer Bd.?
(see TABLE*1.0)

Replace "Power Bd."
yes and "Wire harness".

Is power to T-CON supllied no: 0V
from Main Bd.?
(see TABLE*2.0)

Main Bd. is not working.
yes Replace "Main Bd."

Is LVDS Clock outputed?
(see TABLE*3.0) no: 0V or 1.1V constant

Main Bd. is not working.
Replace "Main Bd."
yes

Confirm LVDS cable connection.
And check for video/OSD again. If the clock output is OK, the
Main Bd. is normally OK, but can
not be 100% sure. If the T Con
Bd. & LVDS do not the correct
problem, please try the Main,
T. Cnt. Bd. or LCD Panel is not working. before ordering a panel.
1st: Replace "T. Cnt. Bd. & LVDS Cable".
If T. Cnt. Bd. & LVDS Cable do not
correct problem, then:
2nd: Replace "LCD Panel"

(TABLE *1.0) Main Bd.: 12V Test Points
42" Models 46" Models 52" Models 12V on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 8" 12 V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *2.0) Main Bd.: "T-CON Power Supply" Test Points
42" Models 46" Models 52" Models 12V on Main Bd.. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K5LV "pin 30" 12 V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *3.0) Main Bd.: "LVDS Clock" Test Points
42" Models 46" Models 52" Models LVDS Clock on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF K5LV pin #33: Clock - Waveform will be
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE K5LV pin #35: Clock + 200 - 450 mV
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF 74.25 MHz
DP42840-03 N7AHE DP46840-03 N7EKE range = 10-20ns/div
DP42840-04 N7AJE
DP42840-07 N7AS

note: The bandwidth of the oscilloscope and probe must be
at least 100 MHZ or higher to check if the clock pluse exists
or not
Repair Flow Chart: Trouble Condition page 4
Power LED turns OFF within 10 sec of Power ON, or LED cycles ON & OFF.
Power LED turns OFF within
10 sec of Power ON, or cycles ON & OFF.

On Main Bd.:
Is 5V supplied to "Power_SW" no: 0V
during LED ON time?
(see TABLE*1.0)
Main Bd. is not working.
Replace "Main Bd."

yes

Unplug cable from Main Bd
yes
to T.Cnt. Bd..
Is symptom changed?
T Con Bd. is not working. Main Bd. may
also not be working.
Replace "T Con Bd. & Main Bd."
no

Is the 12V-24V supplied from no: 0V
Power Bd. during LED ON time?
(see TABLE*2.0 & 2.1)
Power Bd. is not working.
Replace "Power Bd."
yes:

Unplug the cable from Power Bd. yes:
to Inverter Bd.
Is the symptom changed?
Inverter Bd. is not working.
Replace "Inverter Bd."

no:

Main Bd. is not working.
Replace "Main Bd."

(TABLE *1.0) Main Bd.: "Power ON/OFF SW" Test Points
42" Models 46" Models 52" Models 12V on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 1" 5V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *2.0) 12V Test Points
42" Models 46" Models 52" Models 12V on Main Bd. Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK DP52440-00 N7KF Main K8B "pin 8" 12 V
DP42840-01 N7AM DP46840-01 N7EEE DP52440-01 N7KFE
DP42840-02 N7AFF DP46840-02 N7EGE DP52440-02 N7KFF
DP42840-03 N7AHE DP46840-03 N7EKE
DP42840-04 N7AJE
DP42840-07 N7AS

(TABLE *2.1) 15/16/24V Test Points
42" Models 46" Models 52" Models 15 / 16 / 24V on Power Bd Confirmation Voltage
DP42840-00 N7AL DP46840-00 N7EK Power K605 "pin 1" 24 V
DP42840-01 N7AM DP46840-03 N7EKE
DP42840-07 N7AS
DP42840-03 N7AHE Power CN4 "pin 1" 24 V
DP42840-04 N7AJE
DP42840-02 N7AFF DP46840-01 N7EEE DP52440-00 N7KF Power CN2 "pin 12" 42" & 46" =16 V , 52=15 V
DP46840-02 N7EGE DP52440-01 N7KFE
DP52440-02 N7KFF
SERVICE MANUAL FILE NO.

Remote Control Digital DP52440 (U.S.A.)
Color Television (CANADA)
ORIGINAL VERSION

Chassis No. P52440-00

NOTE: Match the Chassis No. on
the unit's back cover with
the Chassis No. in the
Service Manual.
If the Original Version
Service Manual Chassis
No. does not match the
unit's, additional Service
Literature is required. You
must refer to "Notices" to the
Original Service Manual
prior to servicing the unit.

Servicing should be performed by only trained and qualified service personnel.

Contents Specifications
SAFETY INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . 2 POWER RATING . . . . . . . . . . . . . . . . . . . . . . . . . 120VAC
SERVICE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . 3 225 W (AVG.)
ON-SCREEN SERVICE MENU . . . . . . . . . . . . . . . . . . . . . 4 ANTENNA INPUT IMPEDANCE. . . . . . . . . . . . . . . . . 75
POWER FAILURE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . 5 UHF/VHF/CATV
MECHANICAL DISASSEMBLY . . . . . . . . . . . . . . . . . . . . 6 DIGITAL
CHASSIS ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . 8