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post #2071 of 2075 Old 08-24-2014, 09:33 PM
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Quote:
Originally Posted by TW2005 View Post
I have no idea really but it's not the first time i've heard of intermittent 1 blink.
After my last post, it worked fine for a few days and then stopped working again with the 1 blink issue. I'm going to try and work this week on fixing it.
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post #2072 of 2075 Old 08-25-2014, 01:39 AM
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Red face Fix works fine thank you richard uk

Quote:
Originally Posted by svkowalski View Post
i too had the 10-blink problem with my panasonic th-42px80u, but i found the cause and have a workaround. Here's what i found:

I ran into the problem 4 hours after installing the set. I called plasma concierge, & they dispatched a tech to replace the board. 3 days later, i had the problem again, so i took my set back to sears for an exchange.

When i ran into the problem on my new set, i figured something outside the tv might be causing the problem. I have a home theater pc plugged in via dvi-hdmi cable. I discovered that if i unplugged the cable & held the power button in for about 10 seconds, i could reset the tv (this way i didn't lose all my configuration settings). Then, after turning on the tv, i could plug in the dvi-hdmi cable & everything was fine.

Eventually, i found that i could always reproduce the problem in the following sequence:
1. Turn off tv
2. Turn on htpc
3. Turn on tv

if i turn on the tv first, then the pc, no problem. If i turn on the tv with the cable unplugged, then plugged it in, again no problem. After researching ground loop & other possible causes, i could not find any combination of cabling that would prevent the problem, until i discovered i could plug the pc into the front hdmi port of the tv & everything works fine.

So i've been working with panasonic to figure out why the rear hdmi ports are susceptible to this problem, but the front port is not. Since this solved my 10-blink problem (so far!), i'm keeping the tv. Don't yet have a resolution from panasonic...

Hope this helps those who may have a similar situation. I'll post an update once i hear back from panasonic about this.
excellant advise thank you from richard uk fixed.
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post #2073 of 2075 Old 08-27-2014, 08:13 AM
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Okay, I'm back. This is my last attempt at trying to fix my Panasonic. I've posted here before with questions trying to get my TC-P55ST50 fixed and got so frustrated that I shelved the project for a few months. Having a backup tv has really hindered progress on this thing.

To those who know more than I do and are gracious enough to give advice in this thread (ahem... TW2005), here is a brief summary of the problem.

I initially diagnosed the problem as an SS board problem with the 6 blink error code using the 2012 Panasonic troubleshooting guide I found online. (Side note: this guide states that it specifically applies to the TC-P50ST50 and the TC-P50UT50 modles, but I assume that the blink codes for the 50" and 55" inch models are the same).

I replaced the SS only to get a new blink code of 8. Diagnosed the problem to be a bad SC and verified that the existing board had severe burns/brown patches all over the PCB. Several components also appeared to be shorted out. So I replaced the SC and SS yesterday.

Now I (presumably) have a working SC and a working SS board. I powered on the TV and got 8 blink again. Following the troubleshooting guide, I removed the connector from the SS to the A board and powered on again. TV turned on and remained on with black screen. Turned TV off and checked for continuity between pins 1 and 2 of connector SS52. This checked out ok so I then checked for continuity between pins 1 and 2 of SS54, SS55, and SS57 and these also looked ok.

At this point, the guide suggests replacing the SS2 board but I wasn't convinced. Having a fair amount of confidence that my new SS board is not the problem, I decided to focus on the SS2. Looking at the schematics from the Chassis guide, the SS2 board is very simple. Each of the 3 resistors were not shorted (meter showed 117kOhms each, but can't verify the actual resistance without removing the resistors). I also performed a diode check on each diode. I forgot to test diode D16362 but I doubt that there is a problem there as a visual check of the entire board showed no evidence of problems.

SO. Now I'm concerned that it may be a problem with the panel or the connection/connections from the SS/SS2 board to the panel sustain electrodes.

One last thing that I observed from the troubleshooting guide. For 8 blink errors, the guide states that the circuits monitored are the sustain drive circuit and the connection between the SS board and the panel. Conditions that could trigger this shutdown include: abnormality of the sustain drive circuit, open or loose connection between SS/SS2 boards and FPCs from the panel (SS52, SS54, SS55, SS57), Open or loose connection between connectors C10/C20 or C26/C36, or wrong diagnostic by the A board.

That's a lot of possibilities and I feel like I've eliminated most of them. I don't think the A board is a problem since the TV turns on fine when I disconnect the SS board. Also, the connections on the C boards appear fine.

Does anyone know if there is a way that I can verify that the problem is with the panel? Or have any other advice on circuits/boards to check out? Should I still try to replace the SS2 board? If it's the panel, I'll finally be able to send this TV into oblivion and get a new one but until I know for sure that it isn't a less serious and fixable problem, I can't let it go.

Thanks.
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post #2074 of 2075 Old 08-27-2014, 08:59 AM
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Hi, Welcome to this Forum Site Here u can find lots of members Related to ur problem ,
I suggested u for this question you have to ask to the experts , i dont know about this problem
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post #2075 of 2075 Old 08-30-2014, 11:17 AM
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Hi guys,

I bought my Panasonic TCP50U50 in July of 2012. In October of 2013 it failed on me with 8 blinking lights, I had it fixed by a repair shop for about $230. It worked without problem until yesterday (August of 2014) when it failed on me again with 8 blinking lights.

I am kind of torn on the situation, I realize that the problem is very simple and cheap to fix for someone with the skills and know-how. It would be a shame to get rid of it. However, I am not handy enough to do a DIY fix. I don't want to put out the money for a professional repair job again if it going to consistently fail on a yearly basis and the repair is only going to buy me another 10-14 months.

I guess the best avenue is call up Panasonic and tell my story? They did say they would compensate me for SOME of the repair costs last time around (the TV had just gone out of warranty), they never told me how much. I never got around to following up with them after the repair because I was just happy my TV was working again.

This time I expect I will get same routine, they will direct me to the nearest certified repair shop and tell me the TV is out of warranty. Hopefully if I state my case enough they may offer me a decent amount of compensation?

Last edited by cf92; 08-30-2014 at 11:20 AM.
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