14 blinks TC-P50ST30

[northwestdad]

Re: 14 blinks TC-P50ST30

Thank you. I won't get a chance to work on the unit for a couple days and will post any new finds at that time.

[northwestdad]

Re: 14 blinks TC-P50ST30

Quick question that I hope someone can answer. I just saw someone posting a Craigslist ad for a TC-P50ST50 with a broken screen that I could get for around $50 or less and also a seperate ad for a TC-P42ST30 with a broken screen. Any idea if the SC board from either of these would be compatible, or are they totally unique to each upgrade/screen size? Trying to get out of spending $120 to get a circuit board that may or may not be the culprit.

[tw2005]

Re: 14 blinks TC-P50ST30

Quick question that I hope someone can answer. I just saw someone posting a Craigslist ad for a TC-P50ST50 with a broken screen that I could get for around $50 or less and also a seperate ad for a TC-P42ST30 with a broken screen. Any idea if the SC board from either of these would be compatible, or are they totally unique to each upgrade/screen size? Trying to get out of spending $120 to get a circuit board that may or may not be the culprit.

unique, 42 no, 50 series unlikely

You already tested short cct across SC2 pins = dead SC board so that's one board that needs replacing regardless.


yours
http://www.shopjimmy.com/media/catal...c1phuu-top.jpg

42
http://www.shopjimmy.com/media/catal...txnsn1pkuu.jpg

50
http://www.shopjimmy.com/media/catal...C1RFUU-TOP.jpg

[northwestdad]

Re: 14 blinks TC-P50ST30

SC2 is shorted then and is most likely the fault. Try disconnecting SC2 and SC20 ribbon.

THEN power up, should be 8 blinks. If it does then fairly confident only the SC but buffers should be checked also.

because i don't know the set well enough this may or may not work , disconnect sc2, ss11, p35 and 3 white ribbons at the A board and powerup.

hopefully turns on but some of these have the signals routed different so may not

TV could be locked out but with these new tvs I only know what i've read and so far either locked solid led or the 14 blink has been the SC shorted so the advice I've given has worked out but as always there can be an exception.

I'm sure we'll work it out eventually. You've tried 2 boards with 14 blinks so that's a good sign it's not the A, the clicking board just confuses things a little but I suspect it was dud.

I was able to run home real quick and run these tests before the game tonight (Go Blazers!!)

Disconnected SC2 and SC20. Powered up and 8 blinks automatically.

Disconnected SC2, P35, SS11, and A board ribbon cables. Powered up and LED light came on steady...no blinking. Nothing else happened. Was able to power off by using the remote.

When I get a chance I'll try using the Technical Service Manual to really troubleshoot the SC board. I notice they sell repair kit's for around US$30. The components are pretty large and I'm wondering if it's worth trying to replace them or just pay the cost of getting a new(er) entire board.

[tw2005]

Re: 14 blinks TC-P50ST30

I was able to run home real quick and run these tests before the game tonight (Go Blazers!!)

Disconnected SC2 and SC20. Powered up and 8 blinks automatically.

Disconnected SC2, P35, SS11, and A board ribbon cables. Powered up and LED light came on steady...no blinking. Nothing else happened. Was able to power off by using the remote.

When I get a chance I'll try using the Technical Service Manual to really troubleshoot the SC board. I notice they sell repair kit's for around US$30. The components are pretty large and I'm wondering if it's worth trying to replace them or just pay the cost of getting a new(er) entire board.

That confirms your issue is SC board. PSU and A are now confirmed ok as far as generating no SOS .

There's a few posts with guys replacing just those shorted IGBTs with success.

You'll need a soldering iron of reasonable wattage to get enough heat into the metal tab since these are surface mounted and use leaded solder and flux pen to assist with the solder flowing.

I would try self repair but it's like having a bet if you lose it will cost more in the end. so you know it will cost between $30-160 in total assuming the buffers are ok.

Not like you have many choices.

1. replace TV
2. replace entire SC
3. Attempt repair
4. pay a technian

2 & 3 are the cheapest options. You're getting free diagnostics so at worst $160 is not too bad compared to $300-$400 .

Good practice to check the buffer boards too before installing a good sc.

[tw2005]

Re: 14 blinks TC-P50ST30

looks like you got your wish.


Wizards 103

Trail Blazers 116

[tw2005]

Re: 14 blinks TC-P50ST30

get some quality pre-fluxed solder wick to clean the pads up too, makes for a cleaner job.

[northwestdad]

Re: 14 blinks TC-P50ST30

thanks. I do have a soldering iron, but it's pretty generic. I think I'll just pay for a new SC board and be done with it. maybe later experiment on the bad board to see how difficult it is for me to get them off of it.

I'll be sure to post an update once I have installed the new SC board.

[tw2005]

Re: 14 blinks TC-P50ST30

Sure, so when you fix the other you'll have one for next time. I'm thinking 80watt iron would do it

With the buffer boards if you have a meter measure these points.

SU board at connector SU41 , each of these pins 2,6,8 with respect to the gnd plate on buffer.

likewise, pin 6,2,1 SD42 to gnd plate on buffer.

disconnect the little white ribbon in between, disconnectd from the sc board also.

should be ok but to be sure.

I'll need the values

[northwestdad]

Re: 14 blinks TC-P50ST30

OK...The price of the SC is really high, so before buying it I went over the service manual one more time in fine detail and followed the troubleshooting work flow step by step, and it pointed to the power supply as being a likely culprit. I found a P board for $35 (which is around 25% the cost of the SC board), so I figured I'd give it a shot just to make sure. Of course it did no good. So why the heck would the official Panasonic service guide recommend replacing the A board first, and then the P board, with no mention of the SC board when referring to a 14 blink code?

[tw2005]

Re: 14 blinks TC-P50ST30

There's a few whys like why would you after all the work we did? The whole point of isolating the boards and getting it to fire up and stay on was to prove the PSU and A board were ok, otherwise it would have faulted the same.

Like any guide it's just that but all that info is written for the techs not joe public.

Having a short on the PSU can cause false detctions or things to trigger that are not necessarily the true fault.

That's why you need to prove the fault as well.

[northwestdad]

Re: 14 blinks TC-P50ST30

Trying to save a buck, trying to prove I wasn't an idiot and could comprehend a troubleshooting guide. Failed miserably at both.

Please don't assume that I don't trust your diagnosis...that's not it at all. It's just the SC boards are so damn expensive and the power board was so cheap. Everything else I was seeing online pointed to the A or P board, and I had already tried replacing the A board. I figured for piece of mind I would just give it a shot and if it worked great and if not I wasn't out a whole lot of money. I can send it back anyways for a refund minus re-stocking fee and shipping...chalk it up to a learning expense. I'm also the type of person who just learns better by doing and asking questions, like why does every 14 blink issue on the internet direct one to investigate the A board and/or P board? Even ShopJimmy.com has a YouTube video of the same TV specifically troubleshooting the 14 blink error code. What I should have asked you is how you knew the SC board was the issue after disconnecting the cables and checking for LED blink sequence? Why those specific cables? What areas are not getting power or signals and how that effects the whole system when disconnected?

So now I'll be scouring the internet trying to find an SC board selling for a reasonable price...I'm not going to attempt to repair it, unless the new board actually fixes the problem and then I might be willing to experiment.

[tw2005]

Re: 14 blinks TC-P50ST30

I give SJ 5/10 for that video. Watch it again and have the 14 blink flowchart opened.

Verbatim out of that, you could have made a better job of the video yourself.

I like the ending when you're thanked for watching the "10 blink" video at the end.

How do I know? SC board failure is very common ,shorting the PSU plus there's already several confirmed repairs here with SC failure and either solid LED or 14 blink.

[nwflight]

Re: 14 blinks TC-P50ST30

Keep at it, sounds familiar. I bought a multimeter then soldering system but the fix was a new sc card for 60$ from shop jimmy. Will send old one no charge if it will help. The help from this forum is what really fixed my Panasonic. Thanks again.

[tw2005]

Re: 14 blinks TC-P50ST30

.. What I should have asked you is how you knew the SC board was the issue after disconnecting the cables and checking for LED blink sequence? Why those specific cables? What areas are not getting power or signals and how that effects the whole system when disconnected? ...

The 14 blink is detected/triggered on the A-board.
... from previous experience shorted SC can trigger a number of blink codes
... this generation appears to have a pattern of blowing SC boards
... having only the A and P boards hooked up means only the P board is interacting with the A for SOS blinks.

... since the guides suggest either A or P are the cause a true 14 blink would therefor remain.

... a shorted PSU can cause false triggers, generally it's the Sc that does this.

...as soon as Sc2 was disconnected and the 14 blinks went, that proved it was Sc at that point.

... the second part of isolation and having the TV powerup and stay on was for your benefit and to categorically prove it was not A or P.

This very thread started by NWFLIGHT was a solid LED & 14 blink , diagnosed as a SC failure with a replacement SC restoring the TV.

Interesting note, 14 blink in the manual is IR LED SOS which is on the A-board. They don't even mention that in that guide.

[northwestdad]

Re: 14 blinks TC-P50ST30

The 14 blink is detected/triggered on the A-board.
... from previous experience shorted SC can trigger a number of blink codes
... this generation appears to have a pattern of blowing SC boards
... having only the A and P boards hooked up means only the P board is interacting with the A for SOS blinks.

... since the guides suggest either A or P are the cause a true 14 blink would therefor remain.

... a shorted PSU can cause false triggers, generally it's the Sc that does this.

...as soon as Sc2 was disconnected and the 14 blinks went, that proved it was Sc at that point.

... the second part of isolation and having the TV powerup and stay on was for your benefit and to categorically prove it was not A or P.

This very thread started by NWFLIGHT was a solid LED & 14 blink , diagnosed as a SC failure with a replacement SC restoring the TV.

Interesting note, 14 blink in the manual is IR LED SOS which is on the A-board. They don't even mention that in that guide.

Again...your insight and knowledge is greatly appreciated. The SC boards for this model are very scarce..70% of sites I visited were out of stock, and the ones who had them instock were asking up to $180...a couple were even at $400. What the heck? I found a company that was out of stock but offered a repair service, including a 20% off online coupon which brought the total cost of repair to around $45. They also guarantee their work for 6 months so that is the direction I'm going. I don't have the skill or tools to attempt a repair, and couldn't purchase the parts and equipment needed for less then this amount. I'll be sending the board out this weekend and should hopefully get it back within 7-10 days.

Any hints or suggestions regarding removing the SC board from the other two (SN & SD I think)? Looks like a delicate procedure.

[stretchstudebaker]

Re: 14 blinks TC-P50ST30

You might want to install screws with lock washers on SC and SS pcb's Make sure length is same as originals, and do not over tighten.

[northwestdad]

Re: 14 blinks TC-P50ST30

Finally an update. I ordered a repair of the sc board from moduslink.com. it ended up costing around $60 including shipping. They had to order an additional part so took over a month for the repair to be done and the board shipped back to me. I received it would it today, hooked it all back up, and....drum roll please...it worked! Beautiful picture and sound. Everything looked great. So as im going through setting up the channels and the WiFi, there's a small "pop" and screen goes out. Son of a bitch are you kidding me? All this waiting and I get maybe 5 min out of my new tv and the f-ing 14 blink code rears its ugly head again.

[tw2005]

Re: 14 blinks TC-P50ST30

Finally an update. I ordered a repair of the sc board from moduslink.com. it ended up costing around $60 including shipping. They had to order an additional part so took over a month for the repair to be done and the board shipped back to me. I received it would it today, hooked it all back up, and....drum roll please...it worked! Beautiful picture and sound. Everything looked great. So as im going through setting up the channels and the WiFi, there's a small "pop" and screen goes out. Son of a bitch are you kidding me? All this waiting and I get maybe 5 min out of my new tv and the f-ing 14 blink code rears its ugly head again.

I would contact modus and throw it at them, I would expect they'd say send the board back plus also your buffer boards for testing in case they are blowing the SC

[scpat97]

Re: 14 blinks TC-P50ST30

Northwestdad - Sorry for your issues as I'm having the same problem you are,, exactly.. Just wondering if you had any luck following up with moduslink.com as I'm having a hard time finding the SC board as well.. WIll probably give it a shot with repair kit they are selling if all else fails

tw2005 - see all of your feedback and everything has worked for but I can't seem to get any reading on multimeter from pins to ground to check the SD and SU boards.. Does that prove there isn't a short?

With the buffer boards if you have a meter measure these points.

SU board at connector SU41 , each of these pins 2,6,8 with respect to the gnd plate on buffer.

likewise, pin 6,2,1 SD42 to gnd plate on buffer.

disconnect the little white ribbon in between, disconnectd from the sc board also.

should be ok but to be sure.