Master thread for Panasonic plasma not turning on - Page 57

I feel like I've looked through this whole thread and I see all sorts of situations with blinking lights, but today my TC-P50C1 just stopped working while it was on. No flashing lights. No nothing. I've unplugged from the power bar, plugged it straight into the wall, plugged it into a different outlet, let it sit unplugged for several hours, nothing.

Any ideas?

I'd check the fuses on your power supply board. If it isn't turning on at all, blown fuses would make the most sense. However, just replacing them won't solve your problem, check postings for blown fuses for various causes that would pop the fuses.

Posting my repair for the edification of the group... a lot of this isn't new information, but I wanted to summarize in hopes that it will help someone else.

I have a 13th Generation Panasonic Plasma TV, model TC-P50G20 Mfg Date: Nov-2010

A few nights ago, while watching something, the set just shut down and the red power led started blinking. 10 blinks...

OK, at this point, I know nothing, so I turned to the Web for information, of which there is plenty.

I found that if I unplugged the set and plugged it back in I could hear relay clicks:

Plug in -- two relay clicks almost immediately
pause ~15 seconds
two more relay clicks
(This is a normal pattern so far for a working set as well)

Hit the power switch -- two relay clicks almost immediately
short pause 1-3 seconds
two more relay clicks, (power off)
4 blink pattern on red power led

If I hit the power switch during the initial 15 second delay during the initial pre-powerup I would get the 10 blink pattern again.

The AVS Forum, showed up in a lot of my searches, but there are SO many postings about all the different models of Panasonic that it was a little confusing, because each generation of set ends up having slightly different codes and diagnostic trees.

This thread on another forum http://www.badcaps.net/forum/showthread.php?t=20915&page=4 (posting #63) got me real close to my answer that my SC board was the issue. In it, Tom from Leeds, UK said:

I ordered an SC board, the part number for which you can find in the Pansonic Service Manual for the TC-P50G20 on page 96. Search for this PDF: panasonic_tc-p50g20_tc-p50g25_chassis_gpf13du.pdf The part number is: TXNSC1LPUU (CIRCUIT BOARD SC)

While waiting for my part to arrive, I still had some angst that I didn't have all the information and kept searching. I eventually found the "2010 Plasma TV Technical Guide" (link below) which is a slide deck for service technicians from Panasonic. These "Technical Guilds" are easy to find for older 9th, 10th generation sets, but I had more trouble finding this one. On Slide 76, there is a troubleshooting tree that pretty much confirmed what Tom from Leeds said above.

The replacement SC board arrived, and was super easy to replace, but I made sure the TV had been powered off for a few hours to make sure there was no High Voltage waiting for me. Once replaced, the TV powered up just fine. Total down time was 3 days. ( I paid for 2nd day shipping)

Troubleshooting Technical Guide:
http://tsn.pstc.panasonic.com/PASS/olt/files/Plasma/Gen13/2010_FHD_Plasma_TV.pdf

Service Manual
http://www.tgohome.com/ServiceManuals/Panasonic/Panasonic_TC-P50G20_TC-P50G25_chassis_GPF13DU_[SM].pdf


Thanks go out to those who have posted before me to lay the breadcrumbs that lead to my solution.

Hopefully this summary will help other Gen 13, 2010 owners find the documentation they need to troubleshoot and repair their own sets. What I learned in my research was certainly worth the $230 (the minimum on-site service chage without parts) that it would have cost me to have our local, overworked, TV repair guy would have charged me. From what I've heard, it could have taken more than a week for him get the job done.

I have a DEC 2004 Panny TH42PD25 and the other day I went to turn it on, and the power light came on and stayed solid. After 10 seconds I heard the click sequence, but the screen stayed black. When turning it off same thing, power light goes out, then 10 seconds later click sequence to power it down.

It this thing dead? This was a great TV, no burn in, no problems up to this point...it has server me well?

Anyone have any ideas?

Did you ever fix your Panasonic tv 7 blink problem?can you tell me what board fixed it? Thanks

One page back i posted a very similar "no screen" issue to the one thedataman reports above here. Turn it on, 2 clicks, nothing. Power down, same deal. But I do have sound and can change the volume etc. Are there any ideas on the cause or a potential DIY fix? Or is the set beyond help?

Well Square Trade is already taking care of my warranty claim I placed. They assigned a tech and that tech has already called me to inform me that they have ordered the parts (including the SC baord) to repair the TV. The SC board is on back order apparently so I'll have to wait a few weeks.

Well, I guess I should add my story to the list. Here are the specs:

Panasonic Plasma TV: TC-42PX24
We bought it in June of 2012 from Costco, and it's been a great set until it died two weeks ago. I was getting the 10 red blinks. AMEX had given us an extended warranty, but I had to bring it to a tech for an assessment. $69 later, I am told it's the SS board that has shorted (Part number TXNSS1LFUU).

They wanted about $400 total for the repair. While waiting to hear from AMEX, I decided to Google the part. For $400, we were going to dispose of the TV and buy a new one. Turns out I could get the part for $30 and found a video to show how to replace.

So I took the TV apart and pulled the part. Turns out the part is out of stock, but I find a compatible part (at least according to a couple of sites) and order THAT board. It's almost identical outside of how the two ribbon cables connect. All goes back in well. Put her back together and power her up. Now I get SEVEN red blinks!

Crap! Googled that and found a video that talked me through unhooking the SC (SU and SD) board? The question mark is mine as I don't know if I have the right terminology. Looking at the back of the TV, it's the board on the left.

But anyway, unhooked it, powered it up, and now I get 6 blinking red lights, which supposedly means THAT board is bad. Found it online (part #TNPA5066AC) for $30, so I've ordered a replacement. It's on the way! We'll see if it works. But if I have ended up fixing this for $60 and a few hours of my time, then I am happy. I'd rather fix the TV and get a few more years of life out of it versus recycling it.

If it doesn't fix it, I am out $60, and we end up getting a new TV. I'll let you know what happens, but I hope I am on the right path. There aren't THAT many boards left in the back. Wish me luck!

Actually I just left it unplugged for about 2 hours, then plugged it back in and now it's working fine. Go figure.

Didn't work for me...tried plugging it in again a few minutes ago, and got the same blinks as before. *sigh* Guess you were lucky

We'll see if the second $30 board fixes it. If so, yeah! If not...I'm only $60 poorer and a good bit wiser.

Woo hoo! Got the new board today, installed it over lunch, and the TV is working again. All fixed for abut $60! Thanks for the tips and help from the forum!

I have a Panasonic th-46pz85u that has the same exact problems as the tv in this video. Started about two weeks ago, 3 quick clicks and 10 flashing red light and it finally died for good yesterday. How hard is it to solder these little parts in place? I have zero experience with soldering, should I do the easier thing and just replace the power board instead? Thanks for any advice.

edit: or better yet, would it be even cheaper to take my power board to a tv repair shop and just have them replace those parts for me?
Edited by BillSpez - 2/22/13 at 1:38pm

Did you price the board on a site like ShopJimmy.com or see if someone has it on ebay. I was honestly astounded at how little some of these parts cost. The TV repair guy quoted me $200 for one board in my Panasonic and then said it was out of stock. Thanks to Shop Jimmy I found a suitable substitute for $30. Had to get one other board that I found on ebay for $30 (it was $60 from ShopJimmy). Bother were substitutes for the original parts, but once I put them both in, all was well.

For me, I'd definitely replace the board rather than try to solder. My hands just aren't that steady. I now need to get to the local electronics recycling center to drop the two bad boards off.

Good luck with whatever route you choose.

Thanks for the reply. Just like that video, I used the refrigerant on the chip and my tv works fine. But goes right back to 10 flashing light once I shut it off, so I'm fairly sure those same two chips need replacing and I hopefully will be ok.

I've been finding the board for around $130. But the two chips that were replaced in the video cost $8 each. So I was just thinking about buying the chips and taking them along with my power board to a local repair shop and just asking them to replace them. Not sure if they will.

I've also found service available online for around $65 to ship out the power board and they will fix it and return it.

These are the two options I'm thinking about right now.

How much would a new TV cost? At $130, you're...what...1/2 to 1/3 the cost of a new set? But $65 is a better deal. I think with those kind of small solders, I'd send out the board for repair. I guess it wouldn't hurt to spend $16 and give it a try, and THEN ship it off for $65 if you're not successful (assuming you don't damage the board to the point it can't be repaired).

It does feel nice to fix an item on your own and save it from the landfill, doesn't it?

I have a Panasonic TH-42PZ77U (older model from 2008 or so) and I have already removed the SC board once, got it repaired and got the TV back up and running. That was in 2012 sometime. Yesterday I got the same problem (7 blinks). However, this time, I am quite confident that I can repair the board itself. I have a feeling that it may just be a $0.99 capacitor. Has anyone tried this or does anyone know where I might be able to find info about how to test the components on the TNPA4250AB (SC board, aka Y-Sustain board)?

Your model appears to be one that Panasonic has a secret extended warranty to replace the SC board and upgrade the firmware. Others have called Panasonic with success.

If you try to repair it yourself, look for shorted FETs (Q6441 to Q6446, Q6648, Q6649 & Q6651 to Q6654). Then upgrade the firmware.
Edited by tomwil - 2/27/13 at 6:12am

As tomwil said, Panasonic may do this for you. See my post #1034 in this thread for my experience. Regardless of whether you contact them or do it yourself, you should ensure that you have the updated firmware to help avoid this issue in the future. Good luck.

In my case replacing the chip wasn't necessary, but those suspect surface mount capacitors are tiny and I found it quite difficult to solder. I already had a lot of the soldering gear (and experience) I needed to replace the caps but honestly it was not much fun. If I could have got those replacement boards as cheap as people are saying I would have just replaced the boards.

I have the exact same issue with my panasonic tc-p50s30. Straight red LED, no blinks, but if I hold the power button then it will blink 14 times. I'm thinking about fixing it myself, but unsure how to really diagnose which board is messed up. Anyone got any advice, or should I just be in the market for a new TV (bought this one used, so no warranty )

When the TV powers up, does the screen brighten up slightly?

Hi, I`m hoping someone can give me a bit of direction here. I've been reading the forum for a couple of days, and nobody seems to have quite the same problem as I do. A 1 blink code on my 2009 12th Gen Panasonic Plasma TC-P42G15.

I power the TV through a wall switch that turns on a power bar. It started out that it would sometimes not turn on when I turned on the switch, but turning it on with the front TV power switch worked fine. Over time, it would take more and more attempts with the front switch to get it to turn on. That's when I started googling and found this forum, but '1 blink' problems don't seem to be very common. 2 days ago, it would not start up at all, which is when I started removing the back and looking for service manuals.

Info on the G15 seems scarce, (seems like not many were sold), I did find the service manual for the TC-P42G10 here: http://elektrotanya.com/panasonic_gpf12du_chassis_tc-p42g10_plasma_tv_sm.pdf/download.html
with full schematics.
(When I bought the TV, the only thing different between the G10 and G15 seemed to be that the G15 was thinner, and was THX certified. Looking at them, it just looks like the suffix on the A-Board is different)

I also found the 12th Gen Technical guide for TC-P42S1/X1 here: http://elektrotanya.com/panasonic_tc-p42x1_tc-p50x1_tc-p42s1_tc-p46s1_tc-p50s1_2009-plasma_hd_fhd_tv_technical_guide.pdf/download.html
which looks very much like my TV with a different A board again. (But all the block diagrams look accurate, including pinouts). It is more high-level than the service manual.

So: In the G10 Service manual, for the 1 Blink code it says "Unknown SOS or Status SOS". In the 12th Gen technical guide it says: "Panel Status" or "STB 5V Sense Time out".

Currently, I'm thinking an A-Board problem, but they're very rare, and before I try to source one, I'd like to make sure that it's not something else, or something easily fixable.

So, currently my TV is face down on my dining room table, back exposed, and I have a borrowed multi-meter, but am a little hesitant in poking around it willy-nilly. (I'm a computer programmer, not an EE, but am competent to hold a multimeter on 2 pins, if you tell me which points and whether I should be checking AC or DC). When it comes to any board replacement or soldering, I'm fine, but high-voltage freaks me out (keep remembering horror stories from electronics teachers about high-voltages in TVs...)

Can anybody please give me some direction? Thanks!


tl;dr: Can anybody help out with a 1 blink code on a 2009 12th Gen Panasonic Plasma TC-P42G15?

Look at page 26 of that 12th Gen technical guide. Basically you need to verify that the STB (Standby) 5V is reaching the A-board. When the TV is plugged in, voltage check connector P7, pin 5 and connector P25, pin 9 on the P-board for 5V. If either pin is missing the 5V, the P-board is probably defective.

If you have 5V, then check or reseat the cables between the P-board and the A-board and be sure the 5V is reaching the A-board. if 5V is present, then the A-board is probably defective.

Not that I can noticeably tell. I can hear the pop of it coming on, but the screen doesn't seem to brighten. I'll give it another try tonight in the pitch dark and see for sure, but I'm going with no for now. I'm in it to win it with this TV. I'll be repairing it if I can (I've got the repair manual from another thread on here somewhere). I'm just hoping it doesn't cost me a ton, seeing as I got it originally for less than $500.

Thanks a lot for the help Tomwil!

Results: I held ground on a screw on the A-board, and positive to P7 pin 5. When my girlfriend plugged it in, the TV started for the first time in days. Strange coincidence. I unplugged (still reading 5V, capacitors still charged?), and plugged it back in. For the first time ever, no relay click, and no green LEDS on the SS or SC boards. Very odd. Unplugging and replugging still causes no relay clicks.

But then, as I sit down to type this, I hear the TV relay click off....and then I plug it back in and get a relay click. No TV start, but I can hear components getting powered on the SS & SC boards. But now, as opposed to all the other times, the green lights on the SC & SS board light up for a couple of seconds, then dim out (they stayed on as long as the TV was plugged in before).

Unplugging and plugging back in gets nothing until the relay clicks off when unplugged.

Oh, except now, when unplugged, until the relay clicks off, I get the 1 blink code...never happened before while unplugged....

Seems like if it wasn't a power issue before, it sure is one now....

Anybody have any thoughts?

If the power LED continues to blink even after the TV is unplugged, press and hold the power switch on the TV for a few seconds until the LED turns off. This apparently discharges the capacitors and places your TV in the unplugged mode, ready for the next test procedure.

Ok - So i've tried to find my particular problem and can't, so here it goes.

2010 TC-P50S2. A couple of months ago it started not turning on consistently. After I'd unplug and plug it back in a few times it would eventually turn on and I have no problems as long as it is on.

Problem progresses slowly: I *might* get it to turn on after several iterations of:

• turn on
• click
• (pause)
• click
• "endless" number of blinks (ok i've counted up to 55, but I see no reason to believe that fits any Panasonic code sheet)
• Unplug, replug
• turn on
• click
• (pause)
• click
• "endless" blinks
• etc

Every once in a while it will turn on and we just left the TV on for several days with Roku bouncing around on the screen. Then my mom came for a visit and turned the TV off. Now I can't get it back on at all.

I've taken the back off and inspected (as best I can as an inquisitive novice) and see no visible problems with any fuses or anything else.

So as a last resor I have called Geek Squad out for a repair. But if this is something I can fix I'd rather cancel that $$ fiasco.

I did find this power board on Ebay - maybe it's worth a shot? http://www.ebay.com/itm/New-NPX805MS1-Power-Supply-Board-Panasonic-Viera-TC-P50U2-50-Plasma-TV-/290874036963?pt=US_TV_Boards_Parts_Components&hash=item43b97192e3

Thoughts?
Edited by Nathaniel Lee - 3/8/13 at 8:41pm

The blinks could be "1 blink" repeatedly. If so, according to this Panasonic document, the A-board is defective.

If you do have Geek Squad repair your set, please let us know what they find out.

I have a TH-50PZ80U, that started to blink 2 times , then 2 times, then 10 blinks. I am confused on what board I need to replace. I have read this whole forum , most say replace the A board, and some say to replace the Power Board. Any help would be appreciated.

thanks ahead

Most 2 and 10 blink problems can be resolved beginning with this post.