PANASONIC Th-p50g10 6 red blinks

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

ok tom so whats the next step?

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

tw if i take the 6 wires off and do the test what is that going to tell me? This tv is annoying me first i thought it was power then a board then sc board now i have no idea!!! Even when i follow panasonic manual the results are off!!

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

TW took off 3 white cables from A board not the other 3 you mentioned tv stayed on 2 green lights fans stayed on no picture of course when switched off no blinks!!!Does that mean A board is bad?....thanks....CHRIS.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

TW took off 3 white cables from A board not the other 3 you mentioned tv stayed on 2 green lights fans stayed on no picture of course when switched off no blinks!!!Does that mean A board is bad?....thanks....CHRIS.

EDIT: Just spent 2 hours thinking this through . Did not see post#23. Yes A board or issue with the Sc20 ribbon. Read below my thoughts although written before above post.

Please read in entirety.

That's handy to know, you just taught me something.

This was my initial response to below.

tw if i take the 6 wires off and do the test what is that going to tell me? This tv is annoying me first i thought it was power then a board then sc board now i have no idea!!! Even when i follow panasonic manual the results are off!!

No, I think that's a waste of time now. I was hoping if it turned on without any blinks it would prove if the A board has an issue or not. Having digested this further and the waffle below you've already tried this following the flow chart.

yes this is frustrating. I guess there's 2 trains of thought, SOS6 misdetection by the A board and SC board.

I must admit I'm generally biased towards SC failure because it's more common.

I've been thinking about Tom's comment about the level of TPSOS6. It did get me thinking a on it and why measuring SOS6 was a good idea for evidence.

A high there is the trigger for SOS6, but a disconnection of SC20 also triggers SOS6 and the only way that could be would be due to the A board not seeing a signal back from the SC along that ribbon.

So I decided to probe one of my TVs to understand it better and SOS6 goes high initially for the FPC DET then off. I have not timed the sequence but the high comes on mine after 2 different periods.

Not sure if all models are like this but once my TV has been on, one of the relays stays latched for maybe a minute and it starts up quicker and with no relay clicks.

Under that condition the SOS6 goes high immediately then drops after a couple of secs.

From a cold start, it takes a couple of secs for SOS6 to go high then goes low.

But there is another part of the equation to it because when all those connections are removed, you can get the A to boot up with no blinks.

That would have to come from the C board 5V/3.3V_DET. Hence the disconnect C1/C10 in step 1


I'm not understanding how you follow a flow chart and get different results each time.

Maybe if you do that again but take your time and be very particular.

Step 1. Isolates SOS6 triggers, any SOS 6 there must be A, by default it says goes 8 blink.

Is that what happens?

Step 2. SOS6 triggers enabled again, SS33 removed, disables SOS8 , TV should turn on, You say it does not.

SOS8 at this point would be a misdetection so points A board
SOS6 points back to SC/SD/SU

This is the grey area. we've proven on its own the A board is not triggering a false SOS6.

However, clearly there is a timed period where it recognises the SOS6 going high to confirm FPC DET is good, ignores the high to allow it to continue the process, SOS6 goes low, screen should come on, stays low and all good. If faulty then I'd expect it to go high and remain high.

So I have a theory.

For FPC DET to be enabled, the 5V/3.3V det from the C board needs to be active on the A.
This starts a clock where the A expects to see a high on SOS6 and recognised as normal.

Any high after this period would shut it down immediately.

Ok, we can be confident the FPC DET is functional, but lets say for some unknown reason the initial High is simply not reaching the A board, getting to IC9004 or there is a problem with IC9004 on the A board.

This would replicate what we see on TPSOS6, a timeout of the FPC DET, SOS6.

I would like to see if we could dig a little deeper.

SOS6 goes to A33, pin 14. passes through R9110, 100ohm resistor , then to pin 28, IC9004.

If you can get to IC9004 and pin 28, probe that and see if the same 4.75v is being seen at that pin on startup as you got at TPSOS6. If not then we know we have an open cct/bad connection.

If it is good there, I'd be interested to repeat the process on pin 5 which is the SOS6 to the Panel Micom, IC9003 see what it is doing.

May be feasible to isolate pin 5 and see if it will come up good if satisfied SC/SD/SU are good.

certainly an interesting case this one.

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

Took off sc20 ribbon only still got 6 blinks.Then took off all 3 ribbons started normal no picture 2 green lights on fans on so i switched it off no blinks no red light.Fired up steady red light power ok fans on greens on switched off no lights.Does this prove A board or do i need to do your ic9004 test?Thanks.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

Took off sc20 ribbon only still got 6 blinks..

proves A board is looking for SC20 connection- not seen-SOS6-NORMAL

..Then took off all 3 ribbons started normal no picture 2 green lights on fans on so i switched it off no blinks no red light.Fired up steady red light power ok fans on greens on .....

SOS6 likely not to be SC board, not auto-generated by A board BUT there is an issue with the SOS6 (SC20 FPC DET) detection.

Whilst both the sustains were running, did you by chance re-check TPSOS6 on the SC and confirm it had not gone high, reading 4.75V? probably would not hurt to recheck this too

Good chance the problem is on the A board, but don't assume. Also great fault finding opportunity a little different from the norm.

Example: If for arguments sake you now went out and got a new A board and the fault was a break in that SC20 ribbon or corroded connections and I have had one that was green with corrosion. You install that new board and you will be in the same predicament because the point of loss was not determined.

I'd like you to continue following the SOS6 path for these reasons.

1. To cover yourself

2. opportunity to learn and understand more which helps everyone.

3. Maybe feasible to disable and have it working but has safety implications

4. possible component level repair opportunity if IC9004 is the culprit and to learn if this is a fix, again helps others.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

That IC9004 by the way is a $4 part but special order. C1ZBZ0003983

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

TW thanks i just tried voltage test on sos6 with the 3 ribbons off and i get no voltage at all! ic9004 have not found yet wish i was a pro like you!!! Something you might be interested in on my sc board someone has added a small brown thing with stripes on it looked odd.Well if you go to thread 17 and look at the great picture you gave me the 3 green cylinders next to each other, go to the left one and above it theirs a ic black with about 9 legs each side well the bottom left leg has this thing soldered to it and it goes to the small black square to the left of it if you cannot find it i will send picture.Proves someone has messed with the sc board.Look forward to your response thanks again.

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

heres the picture tw make your life a little easier what you think about that critter?

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

photo upside down its the brown thing next to right hand green cylinder.

[tom66]

Re: PANASONIC Th-p50g10 6 red blinks

Looks like a mod someone has done...

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

TW thanks i just tried voltage test on sos6 with the 3 ribbons off and i get no voltage at all! ic9004 have not found yet wish i was a pro like you!!! Something you might be interested in on my sc board someone has added a small brown thing with stripes on it looked odd.Well if you go to thread 17 and look at the great picture you gave me the 3 green cylinders next to each other, go to the left one and above it theirs a ic black with about 9 legs each side well the bottom left leg has this thing soldered to it and it goes to the small black square to the left of it if you cannot find it i will send picture.Proves someone has messed with the sc board.Look forward to your response thanks again.

Ok, so all the evidence is back on the A-board/SC20 ribbon. IC9004 could be on the foil side of the board. Interesting addition.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

heres the picture tw make your life a little easier what you think about that critter?

So is that 22ohm resistor at pin 8 of the iC and the other side of 10ohm R551?

What's the resistance across that , 7 ohms or 22 ohms?

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

For now, go to A33 and just behind the connector ther are 3 SMD resistors, one will be R9110. Hook it all up and probe to the right side of that and start it up to see if a high is getting there initially.

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

TW the ohms are 22.1 how you knew that i dont know!lol is that supposed to be their? Hooked everything up same symptoms turns off. Now looking for 9110.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

TW the ohms are 22.1 how you knew that i dont know!lol is that supposed to be their? Hooked everything up same symptoms turns off. Now looking for 9110.

You can see the color code of the resistor. That suggests the 10 ohm resistor is blown open cct or very high resistance. Picture is not clear enough to see if it looks bad not that you can unless there is a hole or burning.

Two resistors in parallel 1/(1/R1+1/R2)= 1/(1/22 + 1/10) = 6.88ohms

I've highlighted R9110. On the left side of that resistor, should see the same as TPSOS6, on the right could be a bit less with the voltage drop across that resistor.

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

Thanks for picture TW. Just tested it got about 4.55 left and 4.75 right.Does that give us any help?Thanks.

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

yeah, so you're saying what you see on the SC board is reaching those points and means you need an A board or take a gamble replacing IC9004,

[cb007cb]

Re: PANASONIC Th-p50g10 6 red blinks

Ok thanks TW i will try 9004 and then board if no good. Thanks for all the help will let you know as soon as it fires up!!!!

[tw2005]

Re: PANASONIC Th-p50g10 6 red blinks

Ok thanks TW i will try 9004 and then board if no good. Thanks for all the help will let you know as soon as it fires up!!!!

Have you ever removed a 32 pin IC before?