Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

I can still send the faulty replacement SC board back for an exchange. I'm supposed to write on a copy of the invoice "what is wrong with the board." How would I best describe that?

Thanks a lot, again--

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

get your order in now if going moduslinkpts, 25% off 1st 2 weeks in may. must be longer weeks in the USA now being the 15/16th may

that's $51 for this board if you get going and book it online now. have not seen an end date but must be very close

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Replacing the SC board is what made it change from 10 blinks to 7--so that just means the two SC boards were bad in different ways?

I'll get ahold of a different clip to be sure on the SC50. Thanks for the suggestion of moduslinkpts, and thanks a lot for all the help!

Pretty much. depends on how bad they destruct. If SC2 goes short usually 4 blink. 10 / 4 blink is pretty common . you can get a variety of blink codes when the SC goes.

Even had a 1 blink which I honestly did not expect to see but when I got the OP to just power with the A board like you did, incredibly it passed. Learn something every day.

Normally with 1 blink A board is the fault but it was just luck that I suggested checking it.

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Replacing the SC board is what made it change from 10 blinks to 7--so that just means the two SC boards were bad in different ways?

I'll get ahold of a different clip to be sure on the SC50. Thanks for the suggestion of moduslinkpts, and thanks a lot for all the help!

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Continuing with the next step, I still got 7 blinks. I couldn't find a proper clip so I improvised by bending a paper clip so it would fit, but I feel like it was doing the job adequately. Also, when removing the 4 bolts, there was a 5th bolt in between the SD and SU boards. I left that in.

Thanks.

well, not sure how good a paper clip works but you could put it in position then probe the 2 pins and confirm shorted and then test again but with the additional info on the buffers, they're ok and if definitely 7 with the sc50 jump then you got a bad Sc sent to you.

The other result for the A board is exactly what we needed as it means it's a genuine 7 blink from the Sc.

So good news as far as fault finding is concerned but now you have the added expense of another Sc if you can't get a refund but my advice is consider moduslinkpts for rebuild

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Continuing with the next step, I still got 7 blinks. I couldn't find a proper clip so I improvised by bending a paper clip so it would fit, but I feel like it was doing the job adequately. Also, when removing the 4 bolts, there was a 5th bolt in between the SD and SU boards. I left that in.

Thanks.

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Okay. Eliminating the A board, the set did stay on. At the moment I am letting it sit while the voltage dissipates.

As for the questions in your last post, by no reading I meant OL. And reversing the probes I found I did get some readings:

Old SU
pin 2: 13.21Meg
pin 8: went over 20Meg, which is the max for my meter, then OL

Replacement SU
pin 2: 13.35Meg
pin 8: also >20Meg

Old SD
pin 1: 13.12Meg

Replacement SD
pin 1: 13.8Meg

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

I have to make a small correction. if the meter reads 16meg then it should have read something at the no reading positions. try reversing the probes on those but more importantly so long as you have tested the correct pin then i'm happy. if you found pin 4 then 2 & 8 are on the same side of the connector as 4. Pin 1 would be on the opposite side of pin 2.

I have seen this before, must depend on the brand of meter, so long as the correct points were tested then we'll assume good for reasons previously mentioned.

just for clarification, when you say no reading , is that OL or what does the display do? Not 0.00 I hope.

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Thanks--it's time for bed here now so I'll try all that tomorrow evening.

Thank you very much, I really appreciate it.

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Ok, so it's going to take a bit to work through this because there's not a lot of conclusive evidence to be 100%.

The buffers I'm going to say both sets are good and your meter is having trouble reading the higher resistance. if they were an issue we would see low ohms or shorts and the 221k at least is good which gives credibility.

TP82 is higher than i'd expect but depending on which way the probes are placed it will give different results. you could measure that again but place the probes in both directions to get both results so the variation there I can't get anything from. That resistance can go low depending on how bad IC521 is damaged as the 15v feeds that IC.

SC2 on the original is lower than normal so I'm comfortable saying it's bad.check Q661 on that and see if shorted.

So this leaves us now with the predicament of nutting out the current 7 blink.

Firstly, lets try and eliminate A-board for 7 blink.
Disconnect the following, sc2,ss11, 3 white ribbons at the A-board, p35.
Now turn the TV on as normal and confirm if it starts up normally and stays on. There will be no picture.
You may wish to backprobe the P2 or P11 on the p board and see if Vsus (200v) is up and running, this also confirms the TV is in a running state.

Run no more than 30secs , turn off and do NOT reconnect any leads Sc2,ss11 or P35 for 5-10 mins or get the meter and check there is no voltage left there. You can damage the panel with p35 if connected with residual voltage.

Assuming this passes as expected, this is the next step.

Once safe to do so, reconnect all cable and leads, ribbons. (excluding buffer to sc connections) double check everything is correctly seated and all mounting bolts are in place on the SC.

Leave the sd/su disconnected from the Sc, make SURE, the 4 bolts that attach the sd/su to the Sc are REMOVED.

On the Sc board there is a small white 2 pin connector SC50. Short those 2 pins together, an alligator clip can just get in there or maybe an old IDE hard drive jumper may fit.

turn the Tv on and see if 7 blink. if it does then there's something on the Sc bad, if no blinks then by rights the TV should work with the SD/Su connected again and the 4 bolts in place.

With the sd/su there is a small ribbon that connects the 2 boards, make sure that's in place

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

At long last, here are my readings:

original SC board:
SC2 connector pins: 67.3K
TP82: 3.55K
C561: 5.61K

replacement SC board:
SC2 connector pins: 395K
TP82: 4.1K
C561: 5.6K

original SU board:
pin 2: no reading
pin 4: 221K
pin 8: no reading

replacement SU board:
pin 2: no reading
pin 4: 220K
pin 8: no reading

original SD board:
pin 1: no reading
pin 2: 219K
pin 6: 16.28Meg

replacement SD board:
pin 1: no reading
pin 2: 220K
pin 6: 16.17Meg

Thanks--

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Got it, thanks.

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Sorry, I meant on the SC board. I should have been specific. The holes for the bolts look different on it, but I guess it's the same answer. Thanks.

almost, any point the bolts mount that has metal contact will do except where the buffers mount which is floating gnd not chassis.

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Sorry, I meant on the SC board. I should have been specific. The holes for the bolts look different on it, but I guess it's the same answer. Thanks.

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

How do I spot the ground pads? I was hoping they'd be labeled, but no.

Thanks.

for the buffers it's where the large bolts came out of, can't miss the metal plate. pretty sure if you read what i've posted i've stated this .

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

How do I spot the ground pads? I was hoping they'd be labeled, but no.

Thanks.

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

I've got a lot of information to sift through here, so I may not post again soon, but I will report back. Thanks again to tw2005!

Sure, yes it may seem a lot but I'm sure we'll get this on track again and narrow it down. This way we'll be sure .

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

I've got a lot of information to sift through here, so I may not post again soon, but I will report back. Thanks again to tw2005!

[tw2005]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

yep, and i'm logging out of breakfast for work. LOL

[JoeyB]

Re: Panasonic TC-P54S2 plasma TV--won't turn on, originally 10 blinks, now 7 blinks

Thanks a lot for the responses, and especially for the troubleshooting guides. I'm just logging in quickly from work now, and will look more closely later.

Thanks again!