Panasonic sc tnpa5081 rebuild

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

Training guide for the 2010 FHD G20/G25 thanks to SVC for unearthing this little beauty.

This would be helpful for any FHD with the TNPA5081

Good on you, champ.

[rmalbers]

Re: Panasonic sc tnpa5081 rebuild

I want to update this thread for others. I knew from running thru the steps here that I had a bad SC card and could actually see one blown resister. I was finding a number of other bad parts so I was thinking by the time I found a source for the parts and tried to get them soldered into place, well, I was worried about the time involved and my chances for success! So, I bought an SC board from: ModusLink PTS, Inc. for $104 shipped. I had checked the SU and SD card for shorts and they were not shorted so I fired up the TV with the new SC card and it was still a no go. I followed the testing of the SC with the SD and SU cards disconnected and found I had a bad SU and SD card. So I proceeded to get both of them on ebay (for $20) and I got 1/2 a picture (partial SUCCESS!!!, better than nothing right LOL). I got another set of cards (SU and SD) on ebay ($20 shipped) and replaced the SD card and THE TV IS WORKING!!! So, anyway, I think that that place I got the SC card from is the way to go if they have what you need because they are a REAL component level repair business. Ebay worked ok for the cheap stuff but it might not be worth if for some people. Thanks to everyone's info/input on this board, without it I would not have been able to do it! (Sorry I chickened out on the component level repair.)

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

I want to update this thread for others. I knew from running thru the steps here that I had a bad SC card and could actually see one blown resister. I was finding a number of other bad parts so I was thinking by the time I found a source for the parts and tried to get them soldered into place, well, I was worried about the time involved and my chances for success! So, I bought an SC board from: ModusLink PTS, Inc. for $104 shipped. I had checked the SU and SD card for shorts and they were not shorted so I fired up the TV with the new SC card and it was still a no go. I followed the testing of the SC with the SD and SU cards disconnected and found I had a bad SU and SD card. So I proceeded to get both of them on ebay (for $20) and I got 1/2 a picture (partial SUCCESS!!!, better than nothing right LOL). I got another set of cards (SU and SD) on ebay ($20 shipped) and replaced the SD card and THE TV IS WORKING!!! So, anyway, I think that that place I got the SC card from is the way to go if they have what you need because they are a REAL component level repair business. Ebay worked ok for the cheap stuff but it might not be worth if for some people. Thanks to everyone's info/input on this board, without it I would not have been able to do it! (Sorry I chickened out on the component level repair.)

$100 for the SC is ok given what they want for them now. I guess MODULUS took your bad SC?

If not, sell it.

Surprised you could not detect the bad boards, more often than not they go short but they can still go low in resistance.

That's probably why you got away with firing up the SC twice without blowing it again, if they were shorted the SC probably would have popped.

[rmalbers]

Re: Panasonic sc tnpa5081 rebuild

I have sent them an email about buying my bad boards, I'm sure hoping they will buy them or at least take them for reuse. The SD and SU really measured close to right (resistance checks) except the 5V_F measured high but the board that worked measured the same. So whatever was wrong with them didn't really seem to show up with resistance checks on the SC41/42 test points. The good part about that was I wasn't as worried about turning the TV on and trying it, I knew they were not shorted.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

I moved the following post here as this is where I should have originally posted it:

Hey now, I found a fried IC (C0ZBZ0001708) and transistor (DG3D5020SLW) on the SC Board and confirmed the error with the 2010 FHD Plasma TV Troubleshooting Handbook's resistance test on the P15V circuit. There is no other visible damage to the boards. The error light code is seven (7) blinks which indicates SC Board. I plan on testing the SU and SD Boards before retesting the SC Board after I swap the new components.

Apparently, the parts are not available when referenced by Panasonic's part numbers but I found some references here on badcaps.net, to wit:
IC16521 C0ZBZ0001708 IC 1 M81737FP
Q16403 DG3D5020CSLW TRANSISTOR 1 DG502LW

I used the above highlighted part numbers and ordered them.

I have two questions that I hope to find answers to:
1. Do I have the right part numbers?
2. Aside from the SU & SD Boards, are there other parts/components that commonly fail along with the IC and transistor that I should/can check?.

Thank you kindly.
(End of Original Post)

//////

I received the following responses:

#1 From tom66: Are there any other FETs near that FET? Does that IC drive more than one FET? Have you checked the gate series resistor? (usually inbetween the output of IC and the gate.)

#2 From tw2005: Search TNPA5081 and read my post, I'll be amazed if you get it going with just those 2 parts but maybe your the lucky one.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

@tom66 Yes there is one (Q402) other FET near the fried one (Q403) however there is also a D401 & D402 on the same heatsink. I've been looking at the schematic but I can't tell which FETs the IC is driving or where the gate series resistor is. I'll keep studying the schematic maybe it will start to make more sense.

To complicate matters, I am having a hard time testing the FETs (Q402, 403, etc.) and the other three legged components on the heatsinks (D401, 402, etc.). Is the G the Gate, C the Drain and E the Source?

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

Gate,collector,emitter. When they fail they go short from what I've seen but they are paired so one will short the other both would have to be removed to confirm if one or both are shorted.

Check every IGBT on that board for short cct first, ie every item on the heat sinks including the fast recovery diodes.

[tom66]

Re: Panasonic sc tnpa5081 rebuild

Most devices on the sus board are IGBT not FET but they are tested in very similar manners.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

Most of the instructions that I've found on testing IGBTs say to remove it from the circuit. But one said I could just look for low ohms between S-D, D-S while it is in circuit. Do I need to remove them to test?

[Robb]

Re: Panasonic sc tnpa5081 rebuild

I found a Mosfet test on badcaps:

"
a) black on pin 1- red on pin 2 - record ohms
b) black on pin 1- red on pin 3 - record ohms
c) black on pin 2- red on pin 3 - record ohms

If any reading is less than 30 ohms you might have shorted mosfet. Remove from circuit and repeat the tests to verify."

Is pin 1 the S pin (pins are labelled S, C, G)? I really need an ESR meter.

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

Most of the instructions that I've found on testing IGBTs say to remove it from the circuit. But one said I could just look for low ohms between S-D, D-S while it is in circuit. Do I need to remove them to test?

In this instance I would simply test across all combinations of 2 pins in cct for short cct. usually they'll be shorted across all 3 pins..

I use diode mode with the beeper

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

you don't need an ESR meter, I fixed these with nothing more than a FLUKE meter.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

In this instance I would simply test across all combinations of 2 pins in cct for short cct. usually they'll be shorted across all 3 pins..

I use diode mode with the beeper

I found five failed three pin Qxxx point transistors &
I found four failed three pin Dxxx point diodes along the heatsinks.

The points were:
Q402, Q421, Q421, Q452, Q461, D401, D421, D422 & D482.

Q402 & D401 made single-short beeps.

Strangely, the transistor that had cracked in half was still reading as good.

I'll remove and retest the above IGBTs when I find a better soldering iron.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

Looks like D401, D421, D422, D482 are going to be difficult to source.

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

Looks like D401, D421, D422, D482 are going to be difficult to source.

You sure they're all bad? Unusual for all those. measure centre pin to both outer pins in diode mode, measuring outer to outer will show short which is normal, pins are anode, cathode, anode. Center pin is cathode ,

[tw2005]

Re: Panasonic sc tnpa5081 rebuild

Surprised this one is not on your list as shorted

Q16661 RJP63F3A

List for three different boards I fixed.

First:
IC16521 M81737FP ,Q16402 DG502LW ,Q16403 DG502LW,Q16421 DG402RP ,Q16422 DG402RP, Q16661 RJP63F3A shorted,IC16773 TC7SH14F,Q16701 MMBTA92 NXP (7E W)
Q16702 2PD601ART NXP (C3 W), Q16022 30F125

second:

Q16661 RJP63F3A,IC16773 TC7SH14F, Q16702 2PD601ART NXP (C3 W), Q16022 30F125
IC16724 5V 78M05

Third: This one was much worse, most likely because I blew it up a second time not finding everything the first time. Blew it at least 3 more times before I nailed it. Lots of additional casualties.

D16451 B0ECKP000055 DIODE 1 ROHM , RF101L4S 400V 1A
D16482 B0FACP000003 DIODE 1 RFN25TM4SW
Q16452 B1JAEP000012 TRANSISTOR 1 GT45G128
D16702 B0ACCJ000048 DIODE 1 MA2J11100L 80v 100ma switching diode?
IC16521 C0ZBZ0001708 IC 1 M81737FP
IC16561 C0JBAU000088 IC 1 PAVCTH c541 buffer ic
IC16562 C0JBAU000088 IC 1 PAVCTH c541 buffer ic
IC16563 C0JBAB000916 IC 1 c14 INVERTER
IC16691 C0JBAC000363 IC 1 TC7SH00FU(TE85L,J
IC16724 C0CBADE00049 IC 1 BA178M05FP-E2
IC16771 C0CBADC00072 IC 1 78L05L, TA78L05F
IC16773 C0JBAB000715 IC 1 Toshiba TC7SH14F,
PC16461 B3PBE0000054 IC 1 PS9856-2-F3-AX
Q16402 DG3D5020CSLW TRANSISTOR 1 DG3D5020
Q16403 DG3D5020CSLW TRANSISTOR 1 DG3D5020
Q16421 DG3D4020CSRP TRANSISTOR 1 DG3D4020
Q16422 DG3D4020CSRP TRANSISTOR 1 DG3D4020
Q16521 B1HFPFA00001 TRANSISTOR 1 CPH5524-TL-E
Q16551 B1HFPFA00001 TRANSISTOR 1 CPH5524-TL-E
Q16621 B1JADN000009 TRANSISTOR 1 GT30F125
Q16622 B1JADN000009 TRANSISTOR 1 GT30F125
Q16647 B1CBGD000001 FET 1 2SK3018T106,2n7002
Q16661 B1JAER000010 TRANSISTOR 1 RJP63F3A
Q16701 B1ADCN000007 TRANSISTOR 1 MMBTA92
Q16702 B1ABCF000231 TRANSISTOR 1 2PD601ART,215, 2SD0601A0L
Q16818 B1CBGD000001 FET 1 2SK3018T106,
R16452 D0GF5R6JA047 M 5.6 OHM,J, 1/3W
R16521 ERJ6GEYJ101V M 100 OHM,J,1/8W 1
R16522 ERJ6GEYJ101V M 100 OHM,J,1/8W 1
R16551 D0GD100JA059 M 10 OHM,J,1/4W 1
R16707 ERJ6GEYG392 M 3.9KOHM,J,1/8W 1

[Robb]

Re: Panasonic sc tnpa5081 rebuild

You sure they're all bad? Unusual for all those. measure centre pin to both outer pins in diode mode, measuring outer to outer will show short which is normal, pins are anode, cathode, anode. Center pin is cathode ,

The diodes' pins are labeled A & K so I considered the connection between A pins to be normal.

D401 just makes an occasional beep so it may be good.

Unless something changes when I test them after removing them, D421, D422 & D482 appear shorted.

[Robb]

Re: Panasonic sc tnpa5081 rebuild

Surprised this one is not on your list as shorted

Q16661 RJP63F3A

I accidently typed Q461 and meant to type Q661. Unfortunately, that's the only one I am finding on ebay.

Any idea where to get the other parts?:

Q16402 DG3D5020CSLW TRANSISTOR 1 DG3D5020
Q16421 DG3D4020CSRP TRANSISTOR 1 DG3D4020
Q16422 DG3D4020CSRP TRANSISTOR 1 DG3D4020
Q16452 B1JAEP000012 TRANSISTOR 1 GT45G128

D421
D422
D16482 B0FACP000003 DIODE 1 RFN25TM4SW

Or do I have to buck up and buy a $150 refurbished board?

[Robb]

Re: Panasonic sc tnpa5081 rebuild

I found a TC-P50G20 for sale with a cracked screen. What are the chances of TNPA5081 still being good?

[tom66]

Re: Panasonic sc tnpa5081 rebuild

Fair chance of it being OK, but the buffers may be shot.