panasonic tx-p50v20 - 10 blinks

[dj01fad]

Hello.
I've just bought a few days ago this TV for spare parts with a display problem. At a quick scan it turned out that the display is OK, but only the A-board was defective (with the A-board from another tv it works perfect); It starts with no error code, solid green, but no image, display does not starts at all. if I remove the power from the SC, or the SC20 connector it still starts in solid green. even only the A-board connected to the P-board starts in solid green. so... this is it. Knowing the display is OK, I want to repair it. so... today I tried to fit in another board from a GT20 model, that comes with a D-board. I installed also the D-board and made the connections, but, now it's more interesting. The TV stars, but no image; the display is powered, but nothing on it. with the connection from A to D removed, it starts with full white, so I guess the D-board is OK. Also, if i remove the power from the SC, or the SC20 connector, or the SS, the only error I get is 10 blinks. In this case, I guess this A-board is also defective.
Is there any possibility to repair one of them? Or any ideea on measuring something... I also have another board from a G20 that goes into one blink and sometimes it starts and the tv works fine, but it's like one start from 100.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

That's a mountain of info to digest.

There's a number of parts which are puzzling.

To start with, this is the 2D model, sounds like the GT20 is a 3D if it has a D-board and that's not going to work.

For starters that model had an extra row of C boards at the top, (missing), the SC board is different, and the SD board also different.

SO can that idea.

Another A-board works perfect no errors but no displ? How is that perfect?

Disconnecting SC20 or SC2 and it turns on no errors? Something is wrong there, can't be unless all the ribbons are disconnected from the A-board otherwise should be 6 or 7 blinks.

If you've got a 1 blinker that actually starts and produces an image then it may be worth trying this in case it fixes that. Can be corrupted eeprom.

Try swapping the PD4H eeprom from the other A board to the one blinker(not the 3D GT board)

It's an 8 pin and its larger than the other 8 pin eeproms if that helps.

I've fixed 2 2010 series TVs now including the 42" V20 and I reflashed that chip with a good copy of the panel data nad solved it's 1 blink.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

Could be ic9304

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

hello tw2005.

1. I have another (working) 42v20, and with the A-board from this one, the TV works perfect. (now it's working this way)

2. the A-board from gt20 is from a 42 model, with only the lower C-boards, so I installed it together with the D-board and the whole ribbons configuration from gt20 (apart from v20, the gt20 has no fans and no subwoofer). what I forgot to mention is that i've tested them on the 42 panel and this is the board that starts the tv, powers the display with nothing on it. with the connection from the A to D removed it starts in full white; (from what I know, the 42 panels are the same for 2d and 3d models, but the 50 panels are not the same, and the 3d model has upper buffers) if I disconnect the sc20 or the power from SC board, I get 10 blinks. if I disconnect the SS board, I still get 10 blinks.

3. I get no error if I disconnect any ribbon from the 50v20 TV, with it's original A-board.

4. the other board from the g20 is also from a 42 model, and I tested it on the 42 model, and goes into 1 blink.

In conclusion, I have a defective 50v20 A-board, another defective 42gt20 A-board, and another 42g20 A-board. You just gave me the answer to my question, and that one is to give a try to the 1 blink board.
You say to swap the eeprom from the 2d boards and have a try? what IC number would be PD4H eeprom? I don't have the board in front of me, I have only the GT board, and it is different.

later edit: only now I saw that you pointed to IC9304
I will give it a try tomorrow.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

hello tw2005.

1. I have another (working) 42v20, and with the A-board from this one, the TV works perfect. (now it's working this way)

2. the A-board from gt20 is from a 42 model, with only the lower C-boards, so I installed it together with the D-board and the whole ribbons configuration from gt20 (apart from v20, the gt20 has no fans and no subwoofer). what I forgot to mention is that i've tested them on the 42 panel and this is the board that starts the tv, powers the display with nothing on it. with the connection from the A to D removed it starts in full white; (from what I know, the 42 panels are the same for 2d and 3d models, but the 50 panels are not the same, and the 3d model has upper buffers) if I disconnect the sc20 or the power from SC board, I get 10 blinks. if I disconnect the SS board, I still get 10 blinks.

3. I get no error if I disconnect any ribbon from the 50v20 TV, with it's original A-board.

4. the other board from the g20 is also from a 42 model, and I tested it on the 42 model, and goes into 1 blink.

In conclusion, I have a defective 50v20 A-board, another defective 42gt20 A-board, and another 42g20 A-board. You just gave me the answer to my question, and that one is to give a try to the 1 blink board.
You say to swap the eeprom from the 2d boards and have a try? what IC number would be PD4H eeprom? I don't have the board in front of me, I have only the GT board, and it is different.

later edit: only now I saw that you pointed to IC9304
I will give it a try tomorrow.

yeah , that changes things a little. You're right the 42GT is different again.

White with A disconnected would indicate that he A is faulty with no display.


If that eeprom swap clears the one blink then you could swap the rest of the 8 pin eeproms and it will covert to whatever data was on the original although not all need to swap but with out manuals I'd struggle to know.

The one that holds the tuner data would be the same .

will be interesting to see how you go. Of course an eeprom programmer would be handy.

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

Hello...
I've just swapped the eeprom, and I'll give a shot when I'll get back home, and let you know.

Thanks a lot!!!

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

if I'll swap the rest of the eeproms, I guess I'll have to fit the audio IC for subwoofer and the driver for the fans too, together with the rest of the parts...

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

if I'll swap the rest of the eeproms, I guess I'll have to fit the audio IC for subwoofer and the driver for the fans too, together with the rest of the parts...

Mate, I'm confused. maybe you could put some piuctures up of all the models you're working with here.

Different regions the models can vary.

So I take it the V20 has fans and sub

The G20 does not?

That does complicate my suggestion then. I was working on the basis the V20 is like mine but it has no fans, no woofer.

Well I guess at least you may be able to fault find the 42G20 1 blink .

sound slike my ideas are not so good in this case.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

I guess the V20 looks like this?

I think I've been caught out like this before.

sorry about the bum steer but try that eeprom swap at least in case that proves useful



And the 42gt20 like this

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

yes, my v20 has fans and sub, and g20 does not.
it's not a problem, because I can fit in the missing parts. the main problem will be with the fans because it is possible to go into 11 blinks error...
take a look at my boards...
first is from v20, second is from g20. You can see the differences in the top left and right corners.
[img=http://s33.postimg.org/tmgwgs6rf/WP_20160527_13_38_50_Pro.jpg]
[img=http://s33.postimg.org/jyvh7h16j/WP_20160527_13_39_06_Pro.jpg]

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

still 1 blink after eeprom swap. now i'm thinking about to swap the rest of 8 pins eeproms, one by one from one board to another, and do a try after every swap, to see what will happen.

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

still nothing...
tomorrow I'll receive another board from a 42GT20 , known as good, and will try it in the 42 tv; if it is ok, I wonder what can happen if I'll fit it into the 50 tv; for sure it will start, because now it is working with the board from the 42V20... but... for how long will it work?
I can buy a board from a 50G20 for 100 euros, but this board from 42GT20 is for free...

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

still nothing...
tomorrow I'll receive another board from a 42GT20 , known as good, and will try it in the 42 tv; if it is ok, I wonder what can happen if I'll fit it into the 50 tv; for sure it will start, because now it is working with the board from the 42V20... but... for how long will it work?
I can buy a board from a 50G20 for 100 euros, but this board from 42GT20 is for free...

Was worth a try

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

hello....
I received the board, tested it and it's OK.
First, I tested it in the 42 TV, and then I tested it in the 50 TV, and it's working fine here too (I was curious). I think I'll fit the GT board into the 42 TV and leave the 42VT20 board into the 50 TV.
now I still have one question: should I swap all 8 pin eeproms from the original 50v20 board into the 42v20 board, or leave it the way it is... what can go wrong if I leave it this way? and ... the eeprom under the CI slot I think it's near impossible to swap without removing the slot.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

hello....
I received the board, tested it and it's OK.
First, I tested it in the 42 TV, and then I tested it in the 50 TV, and it's working fine here too (I was curious). I think I'll fit the GT board into the 42 TV and leave the 42VT20 board into the 50 TV.
now I still have one question: should I swap all 8 pin eeproms from the original 50v20 board into the 42v20 board, or leave it the way it is... what can go wrong if I leave it this way? and ... the eeprom under the CI slot I think it's near impossible to swap without removing the slot.

Can't really answer that. Normally when I start suggesting eeprom swaps it's from same series board to board, not from a 3d to a 2d and I use the service manuals to compare what eeprom is what because some are the same say between all of them and then some always differ on each size.

So since I don't have all the manuals I can't make any suggestions.

But I'd mark and annotate what each is, where it came from and what model because off the board they're all going to look the same.

If you have an eeprom reader / writer with a clip you could save each file and store it on your PC and name it for easy identification then rewrite the chips without desoldering and resoldering.

[Alastair E]

Re: panasonic tx-p50v20 - 10 blinks

EEPROM swaps between different size screen boards is a sort of last resort IMHO...

Wouldn't it be easier just to find the correct board for the set--Or are you trying to get different/extra functionality from the set?

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

EEPROM swaps between different size screen boards is a sort of last resort IMHO...

Wouldn't it be easier just to find the correct board for the set--Or are you trying to get different/extra functionality from the set?

Hello Alastair

I don't want extra funtionality; I just want the TV working, and the correct board for a 50V20 is hard to find in my country; now I have the board from 42v20 now fitted, and the 42v20 is turned into 42gt20 now,with the board I received for free (I gave another board in exchange).

as for the eeprom swap, it is from 50v20 board to 42v20 board, so both boards are identical, both are 2d, and have same "optionals" (sub and fans). it is working as it is the board from 42 on the 50 panel, but if I change 42 to 50 at panel type in service, it will fail the self test. I don't mind to leave 42 at panel type in service, but I don't know if something wil happen.

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

hello

job done.
1. the 42V20 is now turned into 42GT20, and working perfect in my parents living.
2. the 50V20 is working fine with the mainboard from 42V20 in my living.

there is just one question that remains:
It is right to swap eeproms IC1101, IC4205 and 9304, and maybe the hynix chip from the original 50v20 board to this working 42v20 board? (IC8950 I won't swap because it is under the CI slot) or... leave it the way it is?
this board (or the whole original 42v20) has a lifetimer of 25.000 hours and no problems ever

thanks a lot for help and advices.

[tw2005]

Re: panasonic tx-p50v20 - 10 blinks

been discussing this sort of thing in another thread but this is what I found for the G20E.

I'd expect the same difference in the V series, just swap IC1101 if you're not worried about service history or hours.

42G20E

IC1101 TVRR326

IC4205 TVRR333

IC8921 TVRR329

IC8950 TVRR320

IC9304 TVRR330

50G20E

IC1101 TVRR328

IC4205 TVRR333

IC8921 TVRR329

IC8950 TVRR320

IC9304 TVRR330

Then go into service mode and see if in Panel it says 50FHD ok or 42FHD fail or whatever it says. I think it goes red.

[dj01fad]

Re: panasonic tx-p50v20 - 10 blinks

OK, I'll do this and see what will look like after that.