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12/08/10
2010-2A

SANYO
TROUBLESHOOTING GUIDE
2010 MODELS
DP26640 & DP32640
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:

DP26640-00
DP26640-01
DP26640-02
DP26640-04

DP32640-00
DP32640-01
DP32640-03

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

Unplug (K8C) connector on Main Bd. no: 0V Power Bd. is not working.
On Power Bd.: Is the "5V_STBY"voltage supplied? Replace "Power Bd."
(see TABLE *2.0)

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.
Replace "Key Switch Assy."
yes

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

(TABLE *1.0) Main Bd.: 5V_STBY Test Points
26" Models 32" Models 5V_STBY on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 4" 5V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *2.0) Power Bd.: 5V_STBY Test Points
26" Models 32" Models 5V_STBY on Power Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE CN2 "pin 4" 5V
DP26640-04 N8MH DP32640-03 N8LH
DP26640-01 N8MF DP32640-01 N8LF K6B "pin 4" 5V
DP26640-02 N8MG
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 24V (if applicable) supplied from no: 0V
Power Bd. during LED ON time?
(see TABLE*1.1)

Unplug the cable from Power Bd. to Inverter Bd. is not
yes: 24V
Inverter Bd..
working. Replace
Is the 24V supplied from Power Bd. during
"Inverter Bd.".
yes: 24V 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)
supplied from Main Bd.? no: 0V
(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.

Inverter Bd. or LCD Panel is not working.
1st: Replace "Inverter Bd."
If Inverter Bd. does not correct problem, then:
2nd: Replace "LCD Panel"

(TABLE *1.0) 12V Test Points
26" Models 32" Models 12V on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 8" 12 V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *1.1) 24V Test Points
26" Models 32" Models 24V on Power Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE n/a n/a
DP26640-04 N8MH DP32640-03 N8LH
DP26640-01 N8MF DP32640-01 N8LF Power Bd. K603 "pin 1" 24 V
DP26640-02 N8MG

(TABLE *2.0) Main Bd.: "Power ON/OFF SW" Test Points
26" Models 32" Models Power ON/OFF SW on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 1" 5V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *3.0) Main Bd.: "BL_ON" Test Points
26" Models 32" Models BL_ON Command Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 13" 3.3 V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH
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

If the clock output is OK, the
Main Bd. is normally OK, but can
not be 100% sure. If the T Con
Confirm LVDS cable connection. Bd. & LVDS do not the correct
And check for video/OSD again. problem, please try the Main,
before ordering a panel.

T. Cnt. Bd. or LCD Panel is not working.
1st: Replace "T. Cnt. Bd. & LVDS Cable".
If T. Cnt. Bd. & LVDS Cable does not
correct problem, then:
2nd: Replace "LCD Panel"

(TABLE *1.0) Main Bd.: 12V Test Points
26" Models 32" Models 12V on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 8" 12 V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *2.0) Main Bd.: "T-CON Power supply" Test Points
26" Models 32" Models 12V on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K5LV "pin 23" 12 V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *3.0) Main Bd.: "LVDS Clock" Test Points
26" Models 32" Models LVDS Clock on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE K5LV pin #11: Clock - Waveform will be
DP26640-01 N8MF DP32640-01 N8LF K5LV pin #12: Clock + 200 - 450 mV
DP26640-02 N8MG DP32640-03 N8LH 74.25 MHz
DP26640-04 N8MH range = 10-20ns/div
note: The bandwidth of the oscilloscope and probe must be
at least 100 MHZ or higher to check if the clock pluse exists
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 supplied from Power no: 0V
Bd. during LED ON time?
(see TABLE*2.0)

Unplug pin (#8 & #9) wires from
K8C connector. Is the 12V yes: 12V Main Bd. is not working.
supplied from Power Bd. (#8 & Replace "Main Bd.".
#9) during LED ON time?
yes:

no: 0V
Power Bd. is not working.
Replace " Power Bd."

Is the 24V (if applicable) supplied
from Power Bd. to Inverter Bd. no: 0V
during the LED ON time?
(see table *2.1)

Unplug the cable from Power Bd. to
Inverter Bd. yes: 24V Inverter Bd. is not working.
Is the 24V supplied from Power Bd. during Replace "Inverter Bd."
LED on time?
yes: 24V,
(see table *2.1)
or
(not applicable)

no: 0V
Power Bd. is not working.
Main Bd. is not working. Replace "Power Bd."
Replace "Main Bd."

(TABLE *1.0) Main Bd.: "Power ON/OFF SW" Test Points
26" Models 32" Models 5V on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 1" 5V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *2.0) 12V Test Points
26" Models 32" Models 12V on Main Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE Main K8C "pin 8" 12 V
DP26640-01 N8MF DP32640-01 N8LF
DP26640-02 N8MG DP32640-03 N8LH
DP26640-04 N8MH

(TABLE *2.1) 24V Test Points
26" Models 32" Models 24V on Power Bd. Confirmation Voltage
DP26640-00 N8ME DP32640-00 N8LE n/a n/a
DP26640-04 N8MH DP32640-03 N8LH
DP26640-01 N8MF DP32640-01 N8LF Power Bd. K603 "pin 1" 24 V
DP26640-02 N8MG
FILE NO.

SERVICE MANUAL Remote Control Digital DP26640 (U.S.A.)
Color Television (CANADA)
ORIGINAL VERSION

Chassis No. P26640-00

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 95W (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