Panasonic Viera 65" 7 blinking lights

[Hoosier2014]

I'm really not sure where to start, however from what I can gather there a many other people with similar issues. The model number of this enormous Plasma TV is TC-P65S2. A friend of mine had this in his garage waiting on the landfill. He mentioned the 7 blinking light issue being a huge headache for Panasonic, so I decided to try and fix. The fix has become more of an obsession and hobby.

I replaced the SC board, turned on the TV, and got a picture with horizontal bars. I knew this was the ribbon connectors on the SU and SD, so I turned the unit off and reset the ribbons. Unfortunately, when I turned the power on, I got the 7 blinking lights. Terrible!

What I really need is help isolating where the shorts are in the circuit. What caused the second SC board to go bad? If these boards continue to go bad, I'd think that it would be the same location on the board that shorts.

If there is someone reading this willing to take the time and help me, I'd very much appreciate it (and my wife too as she gets mad watching me stare at all the boards on the back panel). I have a new SU/SD board ordered already, but will not attempt connecting them until I isolate the problem. I have the service manual and two troubleshooting guides if needed.

Thanks in advance,

John

[tom66]

Re: Panasonic Viera 65" 7 blinking lights

When you tested the new board, did you have all the screws installed in it?

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Unfortunately, I did not test prior to putting the screws in. I mounted all 3 boards including the new SC at the same time. I was not smart enough to do any prelim testing. I did notice that some of the screws (the washers) were cupped (or not completely in circumferential contact with the board. Anything I can do with the SC board I removed that may help troubleshoot?

Sincerely appreciate the help Tom.

[tom66]

Re: Panasonic Viera 65" 7 blinking lights

A lot of Panasonic plasmas can suffer damage to the SC board if the screws are not installed. So your new board could have been damaged because of this. Sometimes it is also advisable to change the screw type although I am not sure if this applies for this model, tw2005 may chime in with info on this.

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

I had the screws installed when I turned the tv on. Like I said, the TV candle life with no blinking lights. It was only when I shut off the TV and then turn it back on a couple minutes later that I got the seven blinking light code.

[Hoosier2014]

Re: Panasonic Viera TC-P65S2 7 blinking lights error

I guess what I am looking for help troubleshooting this issue. I can't sink a whole lot more money into this, however my curiosity as to why 2 SC boards have failed has my attention. Panasonic obviously had a problem with these boards and even though the amount of possible problems with them is staggering, there must be certain parts of the board I can point my attention to. I appreciate any help anyone can give me.

[tw2005]

Re: Panasonic Viera 65" 7 blinking lights

I think first step is to see if you can establish if the SC is cactus or not and go from there.

So generally the first step would be to completely isolate the Sd/Su boards from the Sc and then on the SC there will be a 2 pin white connector marked Sc50, jumper those pins together and turn the TV on.

If it starts with no error blinks and the green led on the SS and Sc are lit indicating they are running then the Sc has passed.

from there it's a matter of resistance checking the buffer boards or check if there are shorts between the gnd plates and the outputs at the ribbons connectors.

Sounds like the Sc was ok but bad buffers , but if so chance the Sc may be dead now due to those.

Could also get a meter and see if any of the heatsink mounted transistors (Q locations) are showing short between the pins.

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Thanks for your help. I do not have the SC50 jumper. Should I buy this online or can I make something similar? Lastly, we are talking about the heatsink transistors on SC Board correct? I noticed on the refurb SC board that some of these transistor's looked new with different markings on them. I will check for a short as well.

The LED on the SS does light up by the way.

Thank again.

[tw2005]

Re: Panasonic Viera 65" 7 blinking lights

Thanks for your help. I do not have the SC50 jumper. Should I buy this online or can I make something similar? Lastly, we are talking about the heatsink transistors on SC Board correct? I noticed on the refurb SC board that some of these transistor's looked new with different markings on them. I will check for a short as well.

The LED on the SS does light up by the way.

Thank again.

I've already looked at the board for a 65S2 at SJ and it has a SC50 connector. all you need is something to short those pins, a small alligator clip can usually be carefully placed to short the pins. Small white connector will be near bottom left corner of the board as it sits inthe TV

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

I will check this when I get home. If I can fix this TV, you and Tom are geniuses.

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

I am confused as to how the alligator clip needs to be placed. Are we talking about one clip? Can the clip be in contact with the plastic housing?

Thanks,

John

[Hombre]

Re: Panasonic Viera 65" 7 blinking lights

One aligator clip, just to short those pins inside that white connector. You can put a HDD jumper in there also, point is to short them.

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Frustrating. 7 blinking lights. I'm sure I had the alligator pin covering both pins. I re-ran test several times. Well, assuming 7 blinking lights, where to next?

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

One last thing guys. Most of you guys who help out obviously could build these things yourselves. My question is if there is an outfit who is very reliable whom I could UPS the board to have repaired. Hell, I'd even send the SU board for them to check as well. Also who are reasonably priced.

Do any of you guys repair boards?

John

[tw2005]

Re: Panasonic Viera 65" 7 blinking lights

One last thing guys. Most of you guys who help out obviously could build these things yourselves. My question is if there is an outfit who is very reliable whom I could UPS the board to have repaired. Hell, I'd even send the SU board for them to check as well. Also who are reasonably priced.

Do any of you guys repair boards?

John

Read good feedback for this place.

http://www.moduslinkptstvboards.com/TXNSC1MAUU/

get an order in by July 4 35% off, should be about $65

http://moduslinkptstvboards.com/current-discounts/

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Thank you very much for the link. I'll send the SC board in for repair and purchase the new on sale.

However, can you guys give me your best guess as to what caused the "previously new" sc board to work until I shut the tv off and back on? Would that make the problem one of the buffer boards? Why put in another new one if the last one worked for a brief time, then failed?

John

[tw2005]

Re: Panasonic Viera 65" 7 blinking lights

Thank you very much for the link. I'll send the SC board in for repair and purchase the new on sale.

However, can you guys give me your best guess as to what caused the "previously new" sc board to work until I shut the tv off and back on? Would that make the problem one of the buffer boards? Why put in another new one if the last one worked for a brief time, then failed?

John

hard to say but best practice to check Sd/SU boards before installing any ne w Sc because there is a chance the buffers have shorted and will kill the new SC.

You may also had the ribbons so badly aligned that it shorted it also?

I've killed a Scyself not checking. first time it went SOS7, checked all connectors, 2nd time, it went pop. Buffers were shorted, may have got away with it the first time.

So maybe something was already damaged and 2nd time it popped?

You can always confirm the Sc is good doing the isolation and Sc50 jumper.

The buffers you need to check there are no shorts between the gnd plates and the output pins.

I usually measure resistance on Vfo, Vscn_F and 5v_F.

The S2 and G20/G25 Tvs are very similar. Your SC if you have a look at the TNPA5081 I repaired, pretty much same design larger board and would have additional transistors.

May get some info out of this as a guide. They used the same buffer boards between the S2 and G series with heatsinks added.

https://www.badcaps.net/forum/attach...6&d=1394006853

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Awesome!! Thanks, if it wasn't 2:30am here, I'd get out of bed and do some work. Very cool, that people are willing to help other people try and fix stuff. We spend to much money just dumping crap in the trash when they break.

I'll let you know my results and hopefully you can help me from that point!!!

Thank you!

[Hoosier2014]

Re: Panasonic Viera 65" 7 blinking lights

Quick question, probably not a quick answer. On the main power board, there are what looks like to two small light bulbs. Any idea what these are? They sure don't light up when I turn the TV on. Thanks.

[tw2005]

Re: Panasonic Viera 65" 7 blinking lights

Quick question, probably not a quick answer. On the main power board, there are what looks like to two small light bulbs. Any idea what these are? They sure don't light up when I turn the TV on. Thanks.

Not lights, surge supressors, you don't have a PSU issue.