Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

[gamerfry]

Hi Everyone,

I am receiving a 1 blink SOS upon power on for my plasma. I have read based on my bit of research that this is a general "catch all" error which means I have a bit of work to do. When I bought this TV I was aware that it was having problems and the person I bought it from said Panasonic had told him it was a power supply issue. I am however getting a 5v signal out of the 9th pin in p25 which seems to indicate it is a problem with the A board. Is there any info you can give me or steps I can take to help narrow down the fault? I would also like to avoid replacing an entire board as I am a bit low on cash at the moment so if it is possible to just replace components, no matter how much work, that would be greatly preferable. Thank you all!

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

I don't know of any and self repair of the A board is pretty rare to read about. Guide does seem fairly definite that if you have the 5V as you state, then A board. they are not cheap to find usually and ModuslinkPTS does repair them but again not cheap but may turn out to be the only option if none used are around.

you could try this just in case there's a slim chance a SC board has failed and shorted causing something unusual.

disconnect SC2, SC20, P35, SS11, and the 3 white ribbons at the A board. turn the TV on and see if still 1 blink. Do not re-connect straight away SC2,SS11 and P35, there will be residual voltage that can spike and damage boards and or the panel. Give it 10mins or more or use avlotmeter to see if there is any voltage leaft on those leads. About 200v on the SC2/SS11, maybe 60V on P35.

Obviously if little or no voltage is left it's safe.

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

I disconnected the points you indicated and still received the 1 blink signal so it seems it is the A board. I did find a used A board for $120 but once again would rather wait to see if I can find a way to self repair. If it helps to diagnose the specific problem on the A board this problem has been getting progressively worse over the past 3 months. At first I would get full power on every 2 out of 3 times, after about a month I would have to try it 5 times to get it to turn on. Just these last two weeks it has accelerated to 50 turn on attempts to get a correct turn on (I would just leave it on.) Now it has simply stopped working all together. There doesn't seem to be any plainly visible damage to the board.

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

With photos, preference is to use "advanced" manage attachments and upload but a good effort anyway.

(SORRY, INCORRECT INFO-DELETED)

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

I disconnected the points you indicated and still received the 1 blink signal so it seems it is the A board. I did find a used A board for $120 but once again would rather wait to see if I can find a way to self repair. If it helps to diagnose the specific problem on the A board this problem has been getting progressively worse over the past 3 months. At first I would get full power on every 2 out of 3 times, after about a month I would have to try it 5 times to get it to turn on. Just these last two weeks it has accelerated to 50 turn on attempts to get a correct turn on (I would just leave it on.) Now it has simply stopped working all together. There doesn't seem to be any plainly visible damage to the board.

Honestly, I don't know but I think someone got an A board going again finding a bad SMD cap but again not 100% and where would you start.

(SORRY HAD TO DELETE WRONG INFO)

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Oh are they compatible other than that? I wasn't sure if that was even an option. If it is that is certainly cheaper! I actually thought the S1 is considered the better tv since it has 1080 moving lines resolution compared to the PS's 900 lines moving picture resolution (wouldn't this feature alone make the cpu's incompatible? I would think that it would be trying to send data that couldn't be displayed.

[tom66]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

The moving resolution is determined by the panel phosphor response time and the dithering algorithm. You won't get the benefits of improved phosphor response time, but you will see dithering improvements.

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Sounds like I'm getting an upgrade for less money. Are there no drawbacks other than the loss of the pc port then?

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Sounds like I'm getting an upgrade for less money. Are there no drawbacks other than the loss of the pc port then?

I don't think it's an upgrade if that port is missing, not the first time I've made this suggestion for someone unable to get an exact A board or the cost was prohibitive.

It's only newly listed and a cheap get out of jail.

You'd have to either download the service manuals and or user manuals and compare the features and specs to see what the differences are. but as far as having a Tv with standard ports like HDMI it will be the same. same panels for bot Tvs . I don't see a problem, but you may get other replies and opinions.

Hope it stays available long enough for you to decide.

Go to shopjimmy and search (DELETED WRONG PART#) (SHOULD BE TXN/A1EYUUS (TNPH0786AK)), click on the large image and zoom in for a good look to see what is there. The SD slot is still there on thst S1, at a glance the DB15 was not, AV section seemed the same

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

STOP. hang on I've stuffed up, you have 54"

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Yours, 54PS14, TXN/A1EYUUS (TNPH0786AK)

[tom66]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Could you swap the panel flash from one board to another, to convert 50" to 54"? or similar

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Are you certain it wouldn't work? The only difference is the board suffix?

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Could you swap the panel flash from one board to another, to convert 50" to 54"? or similar

theorectically could work similar to what i've done, will have to look at the manuals and see if i can wrok out the differences. Have to duck out, sorry for the run around fellas.

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Are you certain it wouldn't work? The only difference is the board suffix?

Tv woruld fire up, resolution maybe be wrong, bigger screen, untried by me, sorry, I'll dig more when I get back,
Tom may have some info on it, sorry.

[tom66]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

50" and 54" are both FHD, so if the board is from FHD there'd be no issue there.

The problem comes in the panel drive, the 54" panel has different drive requirements, it is close enough that it MIGHT not matter, but I would not know.
Usually, you'll get pinking on full white, maldischarge sparkies, excessive image retention, high black level etc.

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

P50S1

IC1101 TVRQ724AAS
IC4500 TVRQ583S
IC4501 TVRQ584S
IC4508 TVRQ585S
IC8502 TVRQ500ABS
IC8503 TVRQ503AAS
IC9001 TVRQ565ABS
IC9303 TVRQ624ABS

50ps14

ic1101 TVRQ730S
IC4500 TVRQ583S
IC4501 TVRQ584S
IC4508 TVRQ585S
IC8502 TVRQ500AHS
IC8503 TVRQ509S
IC9001 TVRQ572AD
IC9303 TVRQ624ACS

54PS14
IC1101 TVRQ731S
IC4500 TVRQ583S
IC4501 TVRQ584S
IC4508 TVRQ585S
IC8502 TVRQ500AHS
IC8503 TVRQ510S
IC9001 TVRQ573S
IC9303 TVRQ625S

54S1 to come

IC1101 TVRQ725S
IC4500 TVRQ583S
IC4501 TVRQ584S
IC4508 TVRQ585S
IC8502 TVRQ500AJS
IC8503 TVRQ504S
IC9001 TVRQ566S
IC9303 TVRQ625AAS

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

If I would be replacing MPUs on the board why wouldn't I just do a self repair? Wouldn't that effectively be the same process? Based on a few quick reads the IC9003 (panel MPU) has no output signal at 3 and 5 (ready and alarm signals to primary cpu) nor does it have an ouput signal at 75 to a25 11 of 3v for the panel on signal. Seems like I just need to replace this component, which goes along with the official error code for 1 blink (error communicating with IC9003). Although I would really need to check IC9004 which is a power regulator that sends a 3.3v signal to ready IC9003 for processing.

[tw2005]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

If I would be replacing MPUs on the board why wouldn't I just do a self repair? Wouldn't that effectively be the same process? Based on a few quick reads the IC9003 (panel MPU) has no output signal at 3 and 5 (ready and alarm signals to primary cpu) nor does it have an ouput signal at 75 to a25 11 of 3v for the panel on signal. Seems like I just need to replace this component, which goes along with the official error code for 1 blink (error communicating with IC9003). Although I would really need to check IC9004 which is a power regulator that sends a 3.3v signal to ready IC9003 for processing.

I can tell you this first hand, I accidentally discovered a 1 blink can be caused by a bad EEPROM, was a 2010 model and it was the PD4 flash IC, panel data

On this model it would be PD3 and IC9303 would be the equivalent .

I have no way of helping you work out if it's that or something else unless you had another board of 2009 whose flash could be swapped for a test.

And that is the depth of my knowledge. I got the same PCB , same resolution from a different market, different size and successfully swapped the eeproms to make it my old board except when i transferred one of the eeproms, the 1 blink arrived.

And that's the trap with the eprom swap, you may end up with the same issue in which case if you know which one did it you would order a new one pre-flashed.

good to see you're having a good read, just I have not gone that deep.

[gamerfry]

Re: Troubleshooting 1 blink SOS on 12th generation panasonic viera TC-54PS14

Haha it's certainly been fun. Empty pockets are the mother of invention. I just hope I'm not a lunatic and am actually looking at this circuit correctly. I did put in an offer for the actual replacement board but until I hear back from them Ill just keep trying to self-fix since that would only cost me $7 or so. If I do fix it, I will post a full repair log to hopefully help others in the future.