Panasonic 65" VT20 10 blink code

[infrag]

I've picked up a faulty 65" VT20 on the weekend.
The TV doesnt turn on and emits the 10 blink code when connected.

I've opened this TV up and had a look for anything obvious. There is nothing visually obvious to see.
On initial connection I after its first attempt at powering up I've noticed a noise coming from a section of the powersupply. It seems to be coming from one of the transformers. Its kind of a buzzing noise. I've measured standby voltage of 5v and confirmed that is coming through ok to the A board.

Using the switch on the A board you hear the relays kick in and the buzzing noise at the transformer changes to a higher pitch. I can confirm that the 15V is output on the pins on the PSU. I havent checked what happens to it when it gets to the A board as it is only visible on the meter for about 2-3 seconds.

The leds on the SS and SC boards come on while this happens and then gradually discharge when the startup attempt fails.

Another test I've tried was removing all PSU connections to boards other than the A board. I've taken off the D board connectors from the A board too. The same thing occurs at attempted power up and the same 10 blink code is displayed.

So from this I'd assume that the problem is either the A board or the PSU. The only reason I'd guess the PSU is the noises that it emits from the transformer or components near the transformer sound a bit suspect to me.

Any guidance from anyone on what to check?

I've attempted to record the sounds heard when using the power button on the A board to turn the TV off/on.

https://drive.google.com/open?id=0B-...zliMFgydmF1Wms

[infrag]

Re: Panasonic 65" VT20 10 blink code

Sorry if it feels like I'm being a pain asking for help with 2 tv's at once. (I have another thread with the arcing 50" VT20 tv.)

I was hoping that if I got the 65" going I could test frame on it to compare to the 50" I'm having problems with...

Also wondering can I test the a 50" VT20 A board in this 65" tv if the connectors line up? I realise that the ports probably wont line up with the back of the TV and its not meant to be a permanent swap. I just thought IF it could help diagnose a problem with the PSU or A board of this TV it might help me fix the problem.

[infrag]

Re: Panasonic 65" VT20 10 blink code

I've managed to find a better flow chart for diagnosing this problem. I'll follow the correct procedure and report back. I dont want to waste anyone's time.

[infrag]

Re: Panasonic 65" VT20 10 blink code

OK. So I've tested the TV with the D5 and D3 connectors disconnected.
The tv starts up with a white screen.
I therefore assume that I have a bad A board.

So does anyone have any pointers on where to start on the A board in fixing this?

[infrag]

Re: Panasonic 65" VT20 10 blink code

Took a punt and tried switching the A board from my 50" VT20A.
It turned on and had a display!
Didnt leave it on for very long as I didnt want to kill the board just in case.

Now to repairing the A board from this 65".

If anyones done this before I'd love to know what was wrong with theirs!

[tw2005]

Re: Panasonic 65" VT20 10 blink code

OK. So I've tested the TV with the D5 and D3 connectors disconnected.
The tv starts up with a white screen.
I therefore assume that I have a bad A board.

So does anyone have any pointers on where to start on the A board in fixing this?

What board numbers are the A board for the 50 and the 65 and or photos please.

I know a few tricks. I recently had a 54V20. Blown SC and then found the A board also defective. Board number was different to the 50" which I had 2 spare. Upon closer inspection I discovered the boards were effectively the same except for a ver small difference in assembly on a filter requiring a different PCB pattern.

I converted the 50" board into the 54', hey presto up and running.

So obviously your about to ditch the 50 and try and fix the 65. Nice upgrade, bloody huge TV if you can pull it off.

[tw2005]

Re: Panasonic 65" VT20 10 blink code

Good news, they're both TNPH0844 boards. For sure chuck your 50" A board in and confirm it's A board.

Then I can give some tips?

Or spend $250 for a used A board

[tw2005]

Re: Panasonic 65" VT20 10 blink code

Took a punt and tried switching the A board from my 50" VT20A.
It turned on and had a display!
Didnt leave it on for very long as I didnt want to kill the board just in case.

Now to repairing the A board from this 65".

If anyones done this before I'd love to know what was wrong with theirs!

Must have just posted this before I saw it. Do you want to fix it or do you want to scrap that arcing 50"?

[infrag]

Re: Panasonic 65" VT20 10 blink code

Must have just posted this before I saw it. Do you want to fix it or do you want to scrap that arcing 50"?

Well I've got a couple more things I'm trying on that thing to fix it still before I scrap it.

I wasnt sure if anyone had replaced a failed IC on the A board to make it work or one of the other million parts on it.

If the go is to just buy an A board I'm happy to do that but I havent found an Australia version of it yet on ebay? Got any pointers for that otherwise?

[tw2005]

Re: Panasonic 65" VT20 10 blink code

Well I've got a couple more things I'm trying on that thing to fix it still before I scrap it.

I wasnt sure if anyone had replaced a failed IC on the A board to make it work or one of the other million parts on it.

If the go is to just buy an A board I'm happy to do that but I havent found an Australia version of it yet on ebay? Got any pointers for that otherwise?

It's a tough gig. Try getting a manual and fault find. There's a number of voltages monitored that can trigger 10 blinks.

You don't need exacty manual just any of the VT series would do.

http://www.mxmee.com.au/index.php?ro...acturer_id=335

I hate to say it but I think his pricing is extortion but this is what happens when parts are obsolete and this is stated as New, never used. You can of course check this n the service menu.
I've had boards from a New Zealand who also liked stating they were new and both had 1000's of hrs clocked.

I just posted on another 10 blink A-board thread as I was just wonderin what I'd come across and fixed.

Shorted or damaged SD card slot on the A board. Kids or even adults can stick foreign objects or inserting the wrong way may do the same.

I had one, 10 blinks, 3.3v shorted and was bent pins in that SD slot.

It's free to look so check it, you never never know what you find sometimes.

You can convert any TNPH0844 to suit this size TV so even lok for another 50VT20, smashed screen , whatever but they're fairly scarce to find these days.

[tw2005]

Re: Panasonic 65" VT20 10 blink code

How close to perth were you?

[tw2005]

Re: Panasonic 65" VT20 10 blink code

There's a nice 50" 2D V20 in Cannington. Should just need the SC board going by the description.

[infrag]

Re: Panasonic 65" VT20 10 blink code

That's close by. Got a link?

[infrag]

Re: Panasonic 65" VT20 10 blink code

Nvm found it.thanks. made a cheapish offer

[tw2005]

Re: Panasonic 65" VT20 10 blink code

Nvm found it.thanks. made a cheapish offer

same model went for $50 in Melbourne.

[infrag]

Re: Panasonic 65" VT20 10 blink code

yeh he wants $100
I even offered $80 if I could pick it up tonight...

Takes the fun out of fixing them as nobody really seems keen to buy a plasma around here these days. I loved my 50" and thats how this started but they just have no resale value and I dont need heaps of TV's either.

I love them but everyone is on the LED bandwagon these days.

[tw2005]

Re: Panasonic 65" VT20 10 blink code

yeh he wants $100
I even offered $80 if I could pick it up tonight...

Takes the fun out of fixing them as nobody really seems keen to buy a plasma around here these days. I loved my 50" and thats how this started but they just have no resale value and I dont need heaps of TV's either.

I love them but everyone is on the LED bandwagon these days.

Yeah I think what they do is google the fault. I've posted so much stuff that they'll get a lot of good info that way. Work out it's SC, guess what the TV is worth then take the price of an SC off that.

To fix and sell, no margin there. I paid a $100 for mine but it was 18 months old at the time. Most I've paid is a $100 and the only other was a 50VT30 as it's the top of the line in that series and rare. I've kept the GT340, VT30 plus my original V20(sentimental, first ever decent model I fixed) and a ST30 for a spare.

Someone mentioned OCD
Yeah I love LED, lose one or two LEDs in a string and bye bye $1000 TV.

Generally the plasma panel is pretty robust and most of the issues are SC boards.

[infrag]

Re: Panasonic 65" VT20 10 blink code

Are you sure that the V20 board will work in the VT20?
Does it have the plug for the 3D stuff etc?
He finally agreed on $80 although I'm not sure I want it for that now

[tw2005]

Re: Panasonic 65" VT20 10 blink code

Are you sure that the V20 board will work in the VT20?
Does it have the plug for the 3D stuff etc?
He finally agreed on $80 although I'm not sure I want it for that now

I never said the V20 board will work. I said there's a nice V20 needing most likely a SC board!

Read what I wrote. I even said 2D!

[infrag]

Re: Panasonic 65" VT20 10 blink code

I never said the V20 board will work. I said there's a nice V20 needing most likely a SC board!

Read what I wrote. I even said 2D!

Haha fair enough. Sorry I read what I wanted to read! (idiot moment)