Sanyo_DP50741_P50741-01_J4JF_[SM].pdf part of Sanyo Sanyo DP50741 P50741-01 J4JF [SM] Sanyo_DP50741_P50741-01_J4JF_[SM].pdf, Sanyo Monitor Sanyo_DP50741_P50741-01_J4JF

Text preview for : Sanyo_DP50741_P50741-01_J4JF_[SM].pdf part of Sanyo Sanyo DP50741 P50741-01 J4JF [SM] Sanyo Monitor Sanyo_DP50741_P50741-01_J4JF_[SM].pdf

Back to : Sanyo_DP50741_P50741-01_J | Home

DP50710-00 / 01
DP50740-00 / 02 / 03
DP50741-01
with panel # MD-50H13NBE

Suggestions
The Pwr Bd. is seldom bad.

If the Pwr LED is turning OFF in 4-5 sec., these
are the most common failures on the SC & SS
Bds., If any are shorted, please replace the
board.

SC
D451
D481
Q661
Q401
Q402
Q421
Q422

SS
Q001
Q002
Q021
Q022
SANYO: DP50740-00 / 02 / 03 & DP50710-00 / 01 & DP50741-01 12/28/10
with PANASONIC 50" PLASMA PANEL (MD50H13NBE) p#1
SYMPTOM: TV's GREEN POWER LED WILL NOT REMAIN ON 2010-9B
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.
RESISTANCE CHECKS TO POSSIBLY ISOLATE DEFECTIVE PCB Location of connectors is
1) Is pin #1 or #2 (55-60V) 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 (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 (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.

C907 TPSC1 SC2
C956 SC41 TPVSUS
SC42 P25 P35

SS23 SS11
TPVSUS

BASE PATTERN TEST POINTS:
4 screws total: 2 screws through SU & SC Bds., VERY IMPORTANT p#2
and 2 screws through SD & SC Bds. DP50710-00 / 01
(these screws are not chassis ground) DP50740-00 / 02 / 03
DP50741-01
11/04/10
DP50710-00 / 01 p#3
DP50740-00 / 02 / 03 & DP50741-01 11/04/10

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:
Connector:
P2 p1 191.2 P7 p1 5.0 P25 p1 15.5
p2 p2 p2 15.5
p3 p3
P6 p1 15.5 p4 p4
p2 15.5 p5 p5 5.0
p3 p6 p6
p4 p7 p7
p5 p8 p8
p6 p9 p9 3.0
p7 p10 p10
p8 p11
p9 P35 p1 55.5
p10 P11 p1 191.2 p2 55.5
p11 p2 p3
p3 15.5 p4
FILE NO.

SERVICE MANUAL Remote Control Digital DP50741 (U.S.A.)
Color Television (CANADA)
ORIGINAL VERSION

Chassis No. P50741-01

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 . . . . . . . . . . . . . . . . . . . . . . . . 3 270 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 . . . . . . . . . . . . . . . 10