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SANYO: DP50749-02 & DP50719-00 12/28/10
with PANASONIC 50" PLASMA PANEL (MD50H12NBC) p#1
SYMPTOM: TV's GREEN POWER LED WILL NOT REMAIN ON 2009-9B
note: Unplugging any power cable from the SMPS to isolate the defective PCB will not work on this Panasonic panel.
Unplugging any of the power cables will cause the SMPS to shut down.
a) Unplug LVDS Cable (40 pin connector) from Main to Digital "D" Bd. (D5 connector) behind Main:
This will eliminate the Main Bd., and see if the SMPS will power ON automatically, and remain ON.
Plug the AC Cord to power (do not push the Pwr Key on the TV) and see if the SMPS will power ON.
If the SMPS powers ON and remains ON, then the Main Bd. should be tried. If the SMPS continues to shutdown
then resistance checks (#1-#12) below should be done.
note: This panel has a self test mode, and unplugging the LVDS starts the self test. No raster is displayed,
because a special jig is needed to activate the raster & video.
b) If the Base has ever been removed from the TV, the metal leg could have cut the Flat Ribbon and
PCB underneath the leg. Please see page #4.
RESISTANCE CHECKS TO POSSIBLY ISOLATE DEFECTIVE PCB Location of connectors is
1) Is pin #1 or #2 (60V) of (P35 connector) shorted to chassis Gnd? on page #2
yes, shorted = PDP Panel N/G
not shorted = go to step #2 Please re-install all PCB mounting
2) Is Pin #5 or #6 (5V) of (P25 connector) shorted to chassis Gnd? screws whenever a board is
yes, shorted = go to step #3 changed, and before re-testing
not shorted = go to step #4 the TV. The ground screws are
3) Disconnect (p25 connector) needed to prevent damage to the
Is Pin #5 or #6 (5V) of (P25 connector) shorted to chassis Gnd? PCB.
yes, shorted = SMPS N/G
not shorted = go to step #4 After working on TV, if it has
4) Disconnect (SC20 connector) several horizontal lines or bars,
Is pin #30 (5V) of SC20 connector shorted to chassis Gnd? please try reseating the flat
yes, shorted = SC Bd N/G ribbons going to the SU & SD Bds.
not shorted = go to step #5
5) Disconnect (SS23 connector)
Is pin #1 (5V) of SS23 connector shorted to chassis Gnd?
yes, shorted = SS Bd N/G
not shorted = go to step #6
Reconnect P25, SC20, & SS23 Connectors
6) Disconnect (SC2 connector)
Is TPVSUS (SC2, pin #1, 193V) on SC Bd. Shorted to chassis Gnd?
yes, shorted = SC Bd. N/G
not shorted = go to step #7
7) Reconnect SC2 and disconnect (SS11 connector)
Is TPVSUS (SS11, pin #1, 193V) on SS Bd. Shorted to chassis Gnd?
yes, shorted = SS Bd. N/G
not shorted = Power ON TV, and check TPVSUS on SC Bd. for 193V before shutdown
If no output, = SMPS N/G
If 193V OK is before shutdown, SC Bd. may be defective (can not be sure)
Reconnect SS11 Connector
8) Is TPSC1 (143V) shorted to base pattern of SU/SD Bd?
Base Pattern Test Points are on attached page (please do not use chassis Gnd)
yes, shorted = go to step #9
not shorted = go to step #11, not necessary to check #9 - #10
9) Disconnect SU41 connector
Is TPSC1 shorted to base pattern of SU/SD Bd?
not shorted = SU Bd. may be defective
yes, shorted = go to step #10
10) Reconnect SU41 and disconnect SD42 connector
Is TPSC1 shorted to base pattern of SU/SD Bd?
not shorted = SD Bd. may be defective
yes, shorted = SC Bd. may be defective
11) Measure resistance across C956 (143V across cap.) on SD Bd.. If resistance is only a few ohms, the SD BD. is defective.
12) Measure resistance across C907 (143V across cap.) on SU Bd.. If resistance is only a few ohms, the SU BD. is defective.

If you can not find anything wrong and you suspect the panel is shorted, you can unplug the eight flat ribbons from the panel
to the buffer bds. (SU & SD) and see if the SMPS will remain ON. You can not unplug the flat ribbons to the Sustain Drive
(SS) Bd. (if you unplug the flat ribbon/s to the SS Bd. the panel will shut down). If all PCBs and other connections are OK, the
SMPS will power ON and have all voltages with these ribbons unplugged. If the SMPS should remain ON with the ribbons
unplugged, you should re-connect them and then verify that the SMPS still shuts down when they are connected.
note: The SMPS will remain ON, if one or more of the flat ribbons are unplugged from the panel to the buffer bds. (SU & SD),
if the PCBs and other connections are OK.
SC Bd. SMPS SS Bd.

SC2 P35

SS11
P25
TPVSUS (SC Bd.) TPVSUS (SS Bd.)

SC20, pin #30 SS23

SU41

C907 SD42
C956
TPSC1

BASE PATTERN TEST POINTS:
4 screws total: 2 screws through SU & SC Bds., VERY IMPORTANT p#2
and 2 screws through SD & SC Bds. DP50749-02
(these screws are not chassis ground) DP50719-00
12/16/10
DP50719-00 p#3
DP50749-02 12/16/10

IF YOU BELIEVE THE SMPS IS DEFECTIVE

The SMPS can be checked, but all cables & flat ribbons from the SMPS & Digital Processor PCB
must be unplugged. The only exception is the cable from D25 (D Bd.) to P25 (SMPS) must be
connected. With everything disconnected except this one cable, and when power is applied to
the SMPS, the SMPS should turn ON.

If the SMPS is working OK, please reconnect all connectors to the SMPS & Digital Processor. If
one of the other PCBs is defective, it is possible to damage the SMPS, w/o the flat ribbons
connected to the Digital Processor.

SMPS & Digital Processor

Apply power to the SMPS. No cables attached to SMPS or Digital
Bd., except cable from D25 to P25.

These voltages should be present: P25 p1 15.5
Connector: p2 15.5
P2 p1 193.6 P7 p1 p3
p2 p2 p4
p3 p5 5.0
P6 p1 p4 p6 5.0
p2 15.5 p5 5.0 p7
p3 15.5 p6 p8
p4 p7 p9 5.0
p5 p8 p10
p6 p9 p11 3.3
p7 p10 p12
p8 15.5 p11 p13
p9 15.5
p10 P11 p1 193.6 P35 p1 60.3
p11 p2 p2 60.3
p12 p3 p3
p4 15.5 p4
p#4
12/16/10
If the Base is removed from the TV, the metal leg can damage the flat ribbon between the C2
& C3 PCBs, if it is not pulled straight out from the TV. It can also cut the foil on the C2 PCB. If
the ribbon is cut, the part # is TSXL737.

Leg was not pulled straight
out, and cut the ribbon &
foil on PCB.
Notice
CORRECTION PRODUCTION CHANGE
SERVICE FLASH ADD INFORMATION FILE NO.

Please add this notice to the Service Manual listed below. REVISION 0

Category: COLOR TELEVISION Date: OCTOBER / 29 / 2009

Model: DP50749 Effective from : Chassis No. P50749-02

Destination: U.S.A. / CANADA REF : No. SM780163-02

NOTE: Match the Chassis No. on the unit's back cover with the Chassis No. in the Service
Manual. If the Service Manual Chassis No. does not match the unit's, additional Service
Literature is required. This chassis is similar to Chassis No. P50749-00. Only the
difference Service Information is given in this manual. For detailed Service Information,
refer to the Original Service Manual and Notices for Chassis No. P50749-00 used in
Model DP50749 (SM780163).

SERVICING SHOULD BE PERFORMED BY ONLY TRAINED AND QUALIFIED SERVICE PERSONNEL.

1. IN THE SERVICE ADJUSTMENTS
PAGE 4 ON-SCREEN SERVICE MENU
Item No. 088 OP2 Data should be changed from 3Ch to 3Eh in the table and in Note 2.

2. IN THE CHASSIS ELECTRICAL PARTS LIST MISCELLANEOUS
The reason for change.
A : Misprint B : Quality Reliability C : Standardization
D : Design E : Add as a possible sub F : Schematic location change
G : Purchasing Request

Page & Interchange-
Schematic Part No.
Section Location
Description Q'ty ability Reason

Old N/A NOT USED 0 NO
C1646 ------------------------------------------------------------------ D
New CK1H333KLZBNG CERAMIC 0.033U K 50V 1 NO