tcp50g10 one blink

[cmclemens]

PANASONIC TCP50g10

Ah the mystery single blink. The manual has little to no information on this code. ONE BLINK does not even show up on the main block diagram for possible starting points. I have purchased a Power supply and A board. Switching them out in any order does nothing and I continue to get the ONE FLASH.

I have tested the referenced 5V STB lines on A25 and it comes up fine.

One other thing it does. If I disconnect everything but the P & A boards the unit will not boot but instead clicks 3-5 times and then stops. If I plug in the SS board the same thing happens. BUT if I plug up the SC board then I get a 5 flash error. Making me think it was the SC board. I plugged everthing back in got the single flash and then tried testing the 5V line on the ribbon running to the SC board and got nothing. But that could be the unit is in standby mode and wont send voltage to anything but the STB.

What should I try next?

[R_J]

Re: tcp50g10 one blink

This is from a 2010 training manual, Its all I can offer.

1 Blink SOS: Communication error between System CPU IC8001 and Panel CPU
(IC9003). As Both of these IC’s are located on the A board, only the A board should be
replaced.
Note: In 2009 models, STB5V for IC8001 and IC9003 is provided by 2 different
connectors. For this reason if there was a connection problem between the P board and
the A board, the TV would’ve gone into shutdown with one blink. This is not the case
with the 2010 models. Only the A board can possibly cause a 1 blink shutdown.

[cmclemens]

Re: tcp50g10 one blink

What would be the likelihood that I have two bad A boards?

[cmclemens]

Re: tcp50g10 one blink

Oh and I just looked. I have the 2009 model via the serial number sticker on the inside of the panel.

P7 pin 5 and P25 pin 9 are the STB 5v lines both test between 5.4-5.6 volts.

[R_J]

Re: tcp50g10 one blink

It looks like 1 blink might be a panel sos, so I think anything might cause it, maybe one of the C boards even?

[cmclemens]

Re: tcp50g10 one blink

SO what now go around the whole unit and disconnect one board at a time and see when the error changes?

Is that even really possible?

[R_J]

Re: tcp50g10 one blink

I don't know, I was just looking at the manual, I would not disconnect anything at random, that could cause even more damage. I guess one could try and trace the sos signals, but again I have'nt had this problem so I can't give a cure, I can only suggest a couple things. Maybe someone else has run accross this.

[tom66]

Re: tcp50g10 one blink

5.4~5.6V is quite high for a 5V standby voltage, how sure are you about that? It's marginal but it could be tripping an error detect perhaps?

[cmclemens]

Re: tcp50g10 one blink

I will double check the readings

p25 was 5.17

&

p7 at 5.17

[tw2005]

Re: tcp50g10 one blink

I'm having trouble following the steps you've tried.

Can you try this. connect all cables and ribbons except the following,

SC2,, SS11,P35, A31,A32,A33 and turn the TV on.

If the relay clicks, pay close attention. 3-5 clicks is not an accurate description. e.g. could be 2 quick clicks, pause then a single click.

[cmclemens]

Re: tcp50g10 one blink

I'm having trouble following the steps you've tried.

Can you try this. connect all cables and ribbons except the following,

SC2,, SS11,P35, A31,A32,A33 and turn the TV on.

If the relay clicks, pay close attention. 3-5 clicks is not an accurate description. e.g. could be 2 quick clicks, pause then a single click.

Ok here is what it does.

two clicks

pause

one click

pause

two clicks

pause

one click

pause two clicks

Then it stops. If you press the power switch again it will click once and then have a solid red light but nothing with happen. You can click it off again which it responds to. Switching it back on will either go through the two click one click thing or click once and give you four flashes.

[tw2005]

Re: tcp50g10 one blink

Wow. So both A boards do the same repetitive cycle, and if you then swap the PSu they still do the same?

When you finally get it to do the 1 click after pushing the power switch, Did you check any voltages from the PSU , like Vsus at either P2 or P11?

SOS 4 is normally a PSU blink (other shorted boards can trigger SOS4).

So both PSU give the 4 blink?

So, so far you've had 1,4 and 5 blinks.

Not sure if I've got the brain power for this one, where did the donor A & PSU come from? A known working unit or just recycled parts?

[tw2005]

Re: tcp50g10 one blink

If the 4 blink is repeatable, check this.

Is pin12 of CN P25 on the P board high
before the TV shuts down?

yes is P

No they say A board.

I have had a TV repetitively cycle and it was an A board issue with one of the flash chips .

[cmclemens]

Re: tcp50g10 one blink

Pin 12 on the p25 registers 3.096v But I could not find what the correct voltage is supposed to be. I am a lay person when it comes to this stuff.

[cmclemens]

Re: tcp50g10 one blink

I have a second P & A boards that I bought on EBAY from "previously working units" No matter what combination of the four boards goes in the results are the same. Could the problems lie in the SC or SA boards?

[tw2005]

Re: tcp50g10 one blink

To be honest, I'm lost with this one. By rights I would expect with just the A and P boards connected and all the others isolated it would just turn on with no blinks. Shorted SC or SS may cause these issues but why we can't seem to isolate those to get something to confirm I don't understand.

So, if everything is connected except Sc2 and Sc20 (Sc board isolated) What does it do with the latest set of boards?

[cmclemens]

Re: tcp50g10 one blink

Well now for some reason I plugged in the NEW A & P boards only and got exactly what you described.

It powers on the fans spin and the red light stays constant with no blinking or anything else.

Could all my tests and swapping have been being interfered with residual power still being in the Power Supply board?

Going to plug it all in after an hour and see if it works or what I get for errors. Certainly an hour is long enough for the power to drain off the boards.

[cmclemens]

Re: tcp50g10 one blink

So I plugged everything in and got a 5 flash error.

also

Did the recommended SC2 & SC20 to get the SC board out of the equation and got a 6 flash error. Which the manual says is the SC, SS, SD, or SU. sigh....

[tw2005]

Re: tcp50g10 one blink

So I plugged everything in and got a 5 flash error.

also

Did the recommended SC2 & SC20 to get the SC board out of the equation and got a 6 flash error. Which the manual says is the SC, SS, SD, or SU. sigh....

There's another fella with a 42S10 post, SOS5. He's got shorted SC board, in fact but TOM has mentioned potential panel issue as well which I've got no experience there on that. But shorted out Transistors were found on the SC board. Not too hard to work them out. The SC board in that is different but the TV is the same generation.

If you do a search on TNPA4782 , should get some hits on other G10 posts.

SC failure in the G10 is fairly common. SOS5 is not something I've read much on.

The training guide does list SC as possible SOS 5 .

Now that you've got a correct result with that set of A/P boards, maybe mark them (tape) and swap the other A boards back in and recheck those.

Maybe you had a bad connection or missed a power lead?? That way if they do prove good, sell them in case you need the SC repaired ($150)

https://www.badcaps.net/forum/showthread.php?t=37940

[cmclemens]

Re: tcp50g10 one blink

Ok so I let the power bleed off for an hour before swapping boards and retesting the end result was identical.

5 Flashes with everything plugged in and 6 with the SC board removed.

SO it must be the SC board.

I see on eBay that people have "rebuild kits" for the SC board. Looks like transistors that are commonly blown on these units. How hard is it to soldier those things on?