Panasonic Plasma TH-P50GT30A - 7 blinks

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

WOW, persistence does pay off. I would have trashed it but now I know better. Thanks for the info.

Too, rare, Too expensive to find and fewer components than a 5081 was enough motivation. Besides, I have 2 tvs that use this board.

I think this will be on the rare side as far as failure goes and I'm somewhat suspicious but I am surprised I've fluked another one.

Like i said, I've found nothing mentioned or any kits specific for Q621-623 failing

[syaoran123]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Back to this damn board. reached a dead end and the only clues are Q661, Q621-623 failing. Pretty much checked everything, including PC685.

Anyway, all I could come up with guessing were Q818,819,820, IC921 BD8655 IGBT driver or something missed around Q621-623.

Found nothing spectacular about those tiny FETs, IC921 I have not found any kits or anyone replacing that yet. Was considering borrowing one off another working board.

Anyway < I went back to the opto and probed it in diode and got a reading of 1.6 in both directions, thought that was sus, grab a few other boards and got different results say 1.6 and 0.7.

Pulled it off and no reading either direction, another I had had no reading and 1.4. I'm probing the diode side.

So I reached the conclusion the opto was dead, pilfered off a dead board, now getting 1.4 & 1.6, replaced the usual suspects rjp63G4 & 30F131 that kept blowing and it's back online.

too soon to say it's fixed but maybe the opto was flaky and finally quit. i hope so because I really want this board fixed as a spare.

I guess if I get more than a day out of this things will be looking good as both attempts that failed, worked ok and then failed at startup after a good run. 6 blinks.

Whats an opto? Im getting the same problem. Please help

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Whats an opto? Im getting the same problem. Please help

optocoupler. The small white box could have a toshiba marking TL..... on top

does not mean that's the problem on this either. I thought you were getting a whole board?

[syaoran123]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Sorry, I do not know which optocoupler or white box u are talking about. Maybe my board doesnt have it. The part number is TNPA5330BB. It's not the same board as yours, but very similar. I seen a repair kit thats the same for both TNPA5330 and TNPA5335.

Anyway I know my Q661 (RJP63G4) is faulty which was not included in the repair kit. You said you bought ones from China. Are they reliable or any issues so far? Or would there be any substitute IGBT's for this from RS Components?

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Sorry, I do not know which optocoupler or white box u are talking about. Maybe my board doesnt have it. The part number is TNPA5330BB. It's not the same board as yours, but very similar. I seen a repair kit thats the same for both TNPA5330 and TNPA5335.

Anyway I know my Q661 (RJP63G4) is faulty which was not included in the repair kit. You said you bought ones from China. Are they reliable or any issues so far? Or would there be any substitute IGBT's for this from RS Components?

No issue from UTSOURCE. TV still working. So did you know Q661 was shorted before you started with the kit?

[syaoran123]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

First time i installed the kit, it fired up and worked beautifully for a full length movie. At the end of the movie, the board died again...and now need to buy another repair kit plus the Q621 and Q622. When I replaced these, still 7 blinks. Used multimeter to test Q661 and found short. So only thing left to do is change that transistor. The part is being ordered now.

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

this shows the bad opto I had. Has the toshiba logo but I forgot the TL is not shown, just the P705 but TLP705 is the full number.

I did replace a driver IC and a small driver pnp/npn transistor, but mine still failed after that . Did that opto and all good but I'm pretty confident the 621,622,623 when they short then they take out the q661

[syaoran123]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Just tested my opto and looks pretty normal to me. Hopefully it is just the q661 thats faulty.

[dj01fad]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello there,
I am a big panasonic plasma fan, and I want to tell you my story, maybe you can help.
I have a tx-p50gt30 and a tx-p50gw30, and bought both of them faulty.
They both had sc board faulty, and even more...

1) I managed to repair the gt: I had 2 SC boards (5335): original board with q401-q403 and q421-q423 blown and a board with q621-q623, q600 and q661 blown. since I did not find any specific kit for the w621-q623 failing, like you mentioned, I started to repair the original board from the tv, and I took the IGBT transistors from the other boards. also, I replaced q531 and ic502 just in case. all good until now and the tv is working. still I would like to repair the other board some day...

2) With the gw, things were not so good... the guy before me tried to repair it, but he managed to get things worse: initialy it has 7 blinks; he took off the sc20 and then it has 8 blinks. he insisted that it must have 6 blinks like the '20 generation, and he thougth that it has a ss board problem, and... while trying to take it off, he ripped one flat band from the screen, the upper one from the SS ((( after that, he gave me the tv for spare parts. After some ours of work, I managed to repair the band, with a terminal from another broken panel. I had to remove the panel from the housing because there was not enough space to work. After that, I crossed my fingers and gave a shot with a SC board from another tv, and I found that the panel is OK. all good until now, but i must repair the SC, tnpa 5331. It had just one q622 and q661 blown (30f131 and rjp63). q600 looked OK. I replaced them, and when I started the tv with the buffers disconnected and the SC50 shorted, the tv started green, for about a second I had a buzz and went off. the only thing found dead was only q661. now I am stuck, I dont know what to check or replace, and I dont have another rjp63 to test. After reading you topic I found out about the opto, but I dont have another one that I am sure it is ok to compare and test again. I have just the one from the faulty tnpa5335, but that board is blown the same way, so maybe it has is bad too.
so... any suggestion?
I am curious, in case I find the problem on the board, can I give a shot with buffers disconnected, with a 30f125/30f131 instead of rjp63? or should i wait for another rjp63 that I ordered... what can happen if I do so?
I am thinking to look for another tnpa5331 blown in the common way, because I know that I can fix that one
a pic with the flat band:
https://s23.postimg.org/iadrhvdzv/IM...0414-00058.jpg

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello there,
I am a big panasonic plasma fan, and I want to tell you my story, maybe you can help.
I have a tx-p50gt30 and a tx-p50gw30, and bought both of them faulty.
They both had sc board faulty, and even more...

1) I managed to repair the gt: I had 2 SC boards (5335): original board with q401-q403 and q421-q423 blown and a board with q621-q623, q600 and q661 blown. since I did not find any specific kit for the w621-q623 failing, like you mentioned, I started to repair the original board from the tv, and I took the IGBT transistors from the other boards. also, I replaced q531 and ic502 just in case. all good until now and the tv is working. still I would like to repair the other board some day...

2) With the gw, things were not so good... the guy before me tried to repair it, but he managed to get things worse: initialy it has 7 blinks; he took off the sc20 and then it has 8 blinks. he insisted that it must have 6 blinks like the '20 generation, and he thougth that it has a ss board problem, and... while trying to take it off, he ripped one flat band from the screen, the upper one from the SS ((( after that, he gave me the tv for spare parts. After some ours of work, I managed to repair the band, with a terminal from another broken panel. I had to remove the panel from the housing because there was not enough space to work. After that, I crossed my fingers and gave a shot with a SC board from another tv, and I found that the panel is OK. all good until now, but i must repair the SC, tnpa 5331. It had just one q622 and q661 blown (30f131 and rjp63). q600 looked OK. I replaced them, and when I started the tv with the buffers disconnected and the SC50 shorted, the tv started green, for about a second I had a buzz and went off. the only thing found dead was only q661. now I am stuck, I dont know what to check or replace, and I dont have another rjp63 to test. After reading you topic I found out about the opto, but I dont have another one that I am sure it is ok to compare and test again. I have just the one from the faulty tnpa5335, but that board is blown the same way, so maybe it has is bad too.
so... any suggestion?
I am curious, in case I find the problem on the board, can I give a shot with buffers disconnected, with a 30f125/30f131 instead of rjp63? or should i wait for another rjp63 that I ordered... what can happen if I do so?
I am thinking to look for another tnpa5331 blown in the common way, because I know that I can fix that one
a pic with the flat band:
https://s23.postimg.org/iadrhvdzv/IM...0414-00058.jpg

I'd be ordering the transistors in bulk. I think I ordered 5 and just got it done with 1 to spare .

I don't think it's worth chancing a 360V transistor in place of a 630V and it's 10 amps lower.

I think you mean 5335, not 5331 as that is the SS.

The TLP705 is fairly common on the panasonic SC boards if you had some others laying around and you do have a good one to compare to on the working board.

Definitely sure all of Q621-623 not shorted with Q661 shorted?

I'm not terribly confident with these but it does appear if Q661 is shot it's a tricky one.

It's weird but all I know is I got mine to briefly run and after 2 successive failures it never ran again but made that buzz and popped straight up the third time.

A lot of head scratching and then figured I'd check that opto which I took out of cct in the end to get a proper read.

All I know is since I replaced that and the usual Q661 and whichever 30f131 that blew and it's been running good for 6 weeks now.

I tried searching for other reports of the same failure with Q661 and found little let alone any solution.

So I can't really give you an answer, all I can give you is what I did and the results.

Sure if you can find a board with the more common fault they appear easier but I think it'd be nice to learn how to do the hard ones too.

I perservered because I had an extra board. Could have let it go but I now have the GT working and a working spare SC which is probably worth as much as the TV itself broken.

[dj01fad]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

oops... my bad: not 5331, i mean 5351 (5335 is on the GT)
And yes, I'sure it's just the 661 blown, and the rest is ok. I'll change the opto today or on monday, put a 30f131 and give a shot without the buffers.
Maybe on your board the 621-623 went out because you had the buffers connected ?! I want to fix the board, even if I find another one to start the TV...
how can I check the opto? or just change it?

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Quote

"Pulled it off and no reading either direction, another I had had no reading and 1.4. I'm probing the diode side."

In diode mode

[dick_barton]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Testing opto's are best done by removing them from the circuit board. If it's a transistor / led combination then using your meter in diode mode to test the diode portion.
The transistor (normally the output pins) is a little trickier. If short circuit then obviously faulty otherwise I build up the simple circuits as shown on the internet to test them.

Using a 5V supply the led resistor is 470 ohms and the collector resistor > 10K ohms.

[flocko]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

The opto that TW talks about the TLP705 is a high speed switching unit that can switch the output high and low at very high speeds not easy to test

[Alastair E]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

The PC461 transoptor in many SC boards--A BLACK one, Not the White one, has integral op-amps and is a dual device, so not easy to test without building a circuit to test it properly--Not much point--They are cheap from China.....

Best just replace it whenever there's a blow-up on the SC...

[dj01fad]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello again.
Today I received a tnpa5351 from a friend, and the TV works ok with it, but I have some wonders:
This board is from a 50U30 tv, and has less igbt's on it, and no heatsinks. q401, q621, q421, D641 and d434 are missing. Also, there are some different things:
1. on this board, q402-403, q422-423 are 30f131, and on tv's original board, q4001-403 and q421-423 are DG301. I did not find anything about dg301, and have no ideea if they are the same as 30f131 or they are "smaller", and 3 of these are equal to 2 of those in terms of power ?!
2. on this board d481-2 and q441-2 / d461-2 q451-2 are rf1501 and dg402 (smd), and on tv's board rf2001 and rjp30k3 (non smd)





with the heatsinks it will be simple to fit in, I have some of them from some crashed buffers, and I'll fit them with thermal glue. The main question is that if this board will resist on this tv until I will manage to fix the original or more if I wont, or I must install the missing parts...
by the way, the opto was ok, I installed a sure good one, and same thing: in one second, q661 went out.

P.S. interesting thing... lifetimer says 18 hours ?!?! can this be real?

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello again.
Today I received a tnpa5351 from a friend, and the TV works ok with it, but I have some wonders:
This board is from a 50U30 tv, and has less igbt's on it, and no heatsinks. q401, q621, q421, D641 and d434 are missing. Also, there are some different things:
1. on this board, q402-403, q422-423 are 30f131, and on tv's original board, q4001-403 and q421-423 are DG301. I did not find anything about dg301, and have no ideea if they are the same as 30f131 or they are "smaller", and 3 of these are equal to 2 of those in terms of power ?!
2. on this board d481-2 and q441-2 / d461-2 q451-2 are rf1501 and dg402 (smd), and on tv's board rf2001 and rjp30k3 (non smd)





with the heatsinks it will be simple to fit in, I have some of them from some crashed buffers, and I'll fit them with thermal glue. The main question is that if this board will resist on this tv until I will manage to fix the original or more if I wont, or I must install the missing parts...
by the way, the opto was ok, I installed a sure good one, and same thing: in one second, q661 went out.

P.S. interesting thing... lifetimer says 18 hours ?!?! can this be real?

Sorry to hear that opto swap did nothing, I wish I knew for sure how I fixed mine. very hard when things keep blowing as there may have been something else I replaced but the opto failed after too many blow outs. I'll never know. I don't remember if I replaced the 5 pin transistor that is driven by that opto or not. The board is in the TV so I can't view it.

that's why we need more histories in the forums to learn from.

18 hours, seems wrong unless the A board had been replaced with a new one for the same fault. 18 hours may have been clocked up in the factory.?

Not sure why you want to use the 5351 board. It's a 2D TV model it came from so going 3D may be interesting or risky?

[dj01fad]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello,
My tv is a GW30, not GT30, so it is a 2d model; the original SC was also a 5351 AC, and the one from the U30 is 5351 AF. I have a good tnpa 5335 from another GT30, but it cannot fit because the holes in the panel are in different position, bus both panels are NEO pdp.

[tw2005]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

Hello,
My tv is a GW30, not GT30, so it is a 2d model; the original SC was also a 5351 AC, and the one from the U30 is 5351 AF. I have a good tnpa 5335 from another GT30, but it cannot fit because the holes in the panel are in different position, bus both panels are NEO pdp.

Yeah ok. I guess that's where it's good to start your own thread on different models. I was thinking you were talking about a gt.

Looks like Rev AC is a 46" version so there may be different caps and coils used to match it to the panels you will have to check but it would produce a picture.

[Fleckers tv]

Re: Panasonic Plasma TH-P50GT30A - 7 blinks

I have just picked up one of these with lines on screen, could have got parts for you , lol. Pleased yours is still going