Panasonic tc-p55gt30

[Malachi]

Re: Panasonic tc-p55gt30

I found a TXNSC1NVUU in California for $90 obo, free shipping. No returns, 1 left.
If I put this in the TV is there a possibility it will blow if something else is bad?
So far my tests on the two buffer boards show they are ok correct?

After offer and counter offer, I got it for $80, free shipping.

[Malachi]

Re: Panasonic tc-p55gt30

Some online digging it seems that when they were in stock the TXNSC1NVUU and the TXNSC1NVUUB were listed as interchangeable.

[Malachi]

Re: Panasonic tc-p55gt30

Thanks. I've got TNPA5335 saved in my eBay alerts, so I get notified if any get listed.
According to tw2005 a couple other versions should work.
I'm not adverse to buying from China.

[gdawg]

Re: Panasonic tc-p55gt30

Stuff from China takes a long time to get and you are right, a real pain if you have to send it back. I looked up the service manual for your tv, and it calls for TXNSC1NVUU which is a TNPA5335 with no version #'s. I dont know what would be compatible, but I would be on the look out for that. I am in the process of fixing a TC-P55gt31 which I think is a costco or wallmart version. I ordered a kit from SJ to replace the shorted mosfet's and diodes on the SC board. I have repaired about 5 of those with that same board design and some needed buffers and some didn't. Ideally you need to get the SC board first and install it with out the buffers and there is a procedure to jump terminal SC50 on the SC board and if the tv powers on and doesn't set any codes then you know everything is ok to that point. Then your buffers could be installed after that. Sounds like they are not shorted so you would not damage your SC board. The buffers could still be bad where you wont get a display or the 7 blink code would return. Hope this isn't too much info for you. Keep looking for an SC board. I will check my extra boards but I dont think I have one.

[Malachi]

Re: Panasonic tc-p55gt30

No shorting sounds anywhere.
Would you guys trust buying the sc board from china? They have a return policy but I bet it cost a fortune to ship back.
Seems like all the ones from China are TNPA5335 BG or AG

[gdawg]

Re: Panasonic tc-p55gt30

Forgot to ad. The SC board, TNPA5335 is hard to find, but even if you bought a bad one, they are pretty easy to repair. I would pull up norcal715 on the web and he has a video on repairing a similar board. Look through his videos and I think it was TNPA5349 which is a single board with buffers built into it but the concept is the same. Its a great tv, so hope you stick with it. Some of the Panasonic SC boards are nightmares to repair but the one from your set isn't too bad. Keep looking for a board.

[gdawg]

Re: Panasonic tc-p55gt30

The output pins are the ones that connect to the ribbons on the panel. Ground the black probe and drag the red slowly over all the pins. Easier to do with the lock tab up. I usually do both sides and if one of the buffers is shorted ,it will beep if you have your meter set that way or it will show low ohms. You have to go pretty slow if you dont have the beep. Also I would check the SU board readings again. I found sometimes you have to dig the probe into the pin a little harder to get a read. I had a SD board with about the same readings and it worked. I guess I should add to check the SU board again only if tw2005 agrees.

[Malachi]

Re: Panasonic tc-p55gt30

No beeping

[tw2005]

Re: Panasonic tc-p55gt30

Looking at the meter, in the picture, it says M ohm, correct?
I put black on ground, screw hole, and red on the pins.
What are the output pins?

on the dial you have a diode symbol and a sound bar next to it. select that ,(diode, continuity, buzzer) place one probe on the gnd plate and the other slide slowly across the pins. If it beeps non stop and the meter is 0 then it's a short.

good luck, someone will keep helping.

[Malachi]

Re: Panasonic tc-p55gt30

i wrote it down wrong. I edited my post

[tw2005]

Re: Panasonic tc-p55gt30

What about my readings? Do they make sense? Did I do it correctly?

Unfortunately I can't tell. I get 2 readings in megohms and 1 at about 29K. You give a single reading but no unit of measure so I don't know.

Not saying you done it wrong, could be the meter?

I have to run, stick with it

[Malachi]

Re: Panasonic tc-p55gt30

Looking at the meter, in the picture, it says M ohm, correct?
I put black on ground, screw hole, and red on the pins.
What are the output pins?

[Malachi]

Re: Panasonic tc-p55gt30

What about my readings? Do they make sense? Did I do it correctly?

[tw2005]

Re: Panasonic tc-p55gt30

Ok. I followed tw2005's directions. If I set my new meter right, this is what I get.
On the upper board:
Vfo 13.42 the first time and 13.31 the second time.
Vscn_f 0.L
VF5V 0.L

Lower board:
Vfo 8.92 the first test, 8.98 the second
0.L the rest.

Picture of the meter setting.

try reversing the probes but what units is it showing with the values?

If it's Megohms then strange how you get no readings on the others?

Try continuity between the Vfg plate and along the output pins, any dead short is bad, you may see 0.7 in diode depending on the way the red and black probes are positioned. 0.7 is ok.

Unfortunately I see this a lot depending on the meters used, makes it very hard to help

[tw2005]

Re: Panasonic tc-p55gt30

Any of these.

TXNSC1NVUUB, TNPA5335BA, TNPA5335BK TXNSC1NVUU

[Malachi]

Re: Panasonic tc-p55gt30

Ok. I followed tw2005's directions. If I set my new meter right, this is what I get.
On the upper board:
Vf5v 13.42 the first time and 13.31 the second time.
Vscn_f 0.L
VFo 0.L

Lower board:
vf5v 8.92 the first test, 8.98 the second
0.L the rest.

Picture of the meter setting.

[Malachi]

Re: Panasonic tc-p55gt30

Lots of sc boards on eBay from China but even if my buffer boards are ok, how would I know which revision sc board I would need?

[Malachi]

Re: Panasonic tc-p55gt30

If it helps the buffer board numbers are TNPA5340AK and TNPA5341

[Malachi]

Re: Panasonic tc-p55gt30

They list 3 for my set.
There is TNPA5335BA, TNPA5335 and TNPA5335BK

[Alastair E]

Re: Panasonic tc-p55gt30

Version type generally relates to screen size, SJ should list the set it came from.

--I cant check SJ--They've banned UK IP addresses from their site.....