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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. 

Summary of Contents for DP50719-00

Page 1: ...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...

Page 2: ...C 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 ...

Page 3: ...35 p1 60 3 p11 p2 p2 60 3 p12 p3 p3 p4 15 5 p4 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 workin...

Page 4: ...he 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 ...

Page 5: ... in Model DP50749 SM780163 Page Section Schematic Location Part No Description Q ty Interchange ability Reason 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 ch...

Page 6: ...w CK1E105KGMBNG CERAMIC 1U K 25V 1 NO Old N A NOT USED 0 NO C1668 D New CC1H221JLZCNG CERAMIC 220P J 50V 1 NO Old N A NOT USED 0 NO C1669 D New CK1H104ZLZFNG CERAMIC 0 1U Z 50V 1 NO Old N A NOT USED 0 NO C1679 D New CC1H221JLZCNG CERAMIC 220P J 50V 1 NO Old N A NOT USED 0 NO D1604 D New DDSS3P3 E3 G CERAMIC 390P J 50V 1 NO Old N A NOT USED 0 NO D1605 D New DDSS3P3 E3 G CERAMIC 390P J 50V 1 NO Old ...

Page 7: ...ZA 1 10W 1 NO L1637 D New N A NOT USED 0 NO Old RGFR000ZTAANL MT GLAZE 0 000 ZA 1 10W 1 NO L1638 D New N A NOT USED 0 NO Old N A NOT USED 0 NO L1644 D New RGFR000ZTAANL MT GLAZE 0 000 ZA 1 10W 1 NO Old N A NOT USED 0 NO L1645 D New RGFR000ZTAANL MT GLAZE 0 000 ZA 1 10W 1 NO Old N A NOT USED 0 NO L1646 D New 1AV4L26B5930N INDUCTOR 10U 1 NO Old N A NOT USED 0 NO L1686 D New RGFR000ZTAANL MT GLAZE 0 ...

Page 8: ...1 NO Old N A NOT USED 0 NO R1616 D New RGF1001JTCANL MT GLAZE 1K JA 1 10W 1 NO Old N A NOT USED 0 NO R1617 D New RGF1001JTCANL MT GLAZE 1K JA 1 10W 1 NO Old N A NOT USED 0 NO R1618 D New RGF6801FTCANL MT GLAZE 6 8K FA 1 10W 1 NO Old RWXLB71R2KXAL WIRE WOUND 1 2 KA 7W 1 NO R1640 D New N A NOT USED 0 NO Old N A NOT USED 0 NO R1668 D New RGF2202FTCANL MT GLAZE 22K FA 1 10W 1 NO Old N A NOT USED 0 NO ...

Page 9: ...10W 1 NO R1816 D New N A NOT USED 0 NO Old 1LB4L26B0700G INDUCTOR 120 OHM 1 NO R1821 D New N A NOT USED 0 NO Old N A NOT USED 0 NO R6300 D New RGF1000JTCANL MT GLAZE 100 JA 1 10W 1 NO Old N A NOT USED 0 NO R6319 D New RGF1000JTCANL MT GLAZE 100 JA 1 10W 1 NO Old RGFR000ZTCANL MT GLAZE 0 000 ZA 1 10W 1 NO R6347 D New N A NOT USED 0 NO Old N A NOT USED 0 NO R6349 D New RGFR000ZTCANL MT GLAZE 0 000 Z...

Page 10: ... Arkansas 72335 2000 Page Section Schematic Location Part No Description Q ty Interchange ability Reason Old N A NOT USED 0 NO R843 D New RGF4701JTCANL MT GLAZE 4 7K JA 1 10W 1 NO Old 1AA4W30B56400 CORD 50INCH 40P 31P LVDS 1 NO WK5LV D PN New 1AA4W30B61901 CORD 50INCH 40P 31P LVDS 1 NO Old 1AV4T44B02600 PDP MODULE 1 NO EL901 D New 1AV4T44B02800 PDP MODULE 1 NO Page 21 Chassis Electrical Parts List...

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