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SANYO: DP42740-00 / 02 / 03 12/29/10
with PANASONIC 42" PLASMA PANEL (MD42H13NBE) p#1
SYMPTOM: TV's GREEN POWER LED WILL NOT REMAIN ON 2010-8B
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-#9) 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.
Location of connectors is on
RESISTANCE CHECKS TO POSSIBLY ISOLATE DEFECTIVE PCB page #2
1) Is pin #1 or #2 (55-60V) of (P35 connector) shorted to chassis Gnd?
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 (SN20 connector) several horizontal lines or bars,
Is pin #30 (5V) of SN20 connector shorted to chassis Gnd? please try reseating the flat
yes, shorted = SN Bd N/G ribbons going to the SN Bd.
not shorted = go to step #5 note: The TV must be OFF to
5) Disconnect (SS23 connector) re-seat these ribbons. The SN Bd.
Is pin #1 (5V) of SS23 connector shorted to chassis Gnd? will be damaged, if you try to
yes, shorted = SS Bd N/G re-seat ribbons, with power applied.
not shorted = go to step #6
Reconnect P25, SN20, & SS23 Connectors
6) Disconnect (SN2 connector)
Is TPVSUS (SN2, pin #1, 191V) on SN Bd. shorted to chassis Gnd?
yes, shorted = SN Bd. N/G
not shorted = go to step #7
7) Reconnect SN2 and disconnect (SS11 connector)
Is TPVSUS (SS11, pin #1, 191V) on SS Bd. shorted to chassis Gnd?
yes, shorted = SS Bd. N/G
not shorted = Power ON TV, and check TPVSUS (SN2, pin #1) for 191V before shutdown
If no output, = SMPS N/G
If 191V OK is before shutdown, SN Bd. may be defective (can not be sure)
Reconnect SS11 Connector
8) Is TPSN1 (14V) shorted to chassis Gnd?
yes, shorted = SN Bd. N/G
not shorted = go to step #9
9) Measure resistance across C909 & C959 (146V across cap.) on SN Bd..
If resistance is only a few ohms across either capicator, the SN 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 Scan Drive (SN) Bd. and see if the SMPS will remain ON. You can also do this with the Sustain Drive (SS) Bd.. 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 (with power off) 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 from the panel to the SN or SS Bds. are unplugged, if the
PCBs and other connections are OK. (special note: If you work on a Panasonic 50" Plasma , the flat ribbons to the SS Bd. can
not be unplugged. Unplugging the flat ribbon/s to a 50" SS Bd. will cause it to shut down.
SN Bd. SMPS SS Bd.
SN2 P25
C909 C959 P35 SS11
SN20 SS23
p#2
DP42740-00 / 02 / 03
11/08/10
DP42740-00 / 02 / 03 p#3
11/08/10
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 15.7
p2 p2 p2 15.7
p3 p3
P6 p1 15.7 p4 p4
p2 15.7 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 55.4
p10 P11 p1 191.2 p2 55.4
p11 p2 p3
p3 15.7 p4
FILE NO.
SERVICE MANUAL Remote Control Digital DP42740 (U.S.A.)
Color Television (CANADA)
ORIGINAL VERSION
Chassis No. P42740-01
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
POWER MENU ENTER
VOL CH
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 . . . . . . . . . . . . . . . . . . . . . . . . 3 219 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