Yet Another TC-P55GT30 7 Blinking Light Error

[Elevatorguy4]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Thanks so much for the help Moreno83. I replaced the SC board after work today and the TV is back up running again. I forgot to get the updated screws from the place I bought the board so I will get them when I return my core. By the way, 5 of the 7 factory screws on the original SC board were very loose.

[JeffJ]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Thanks so much for the help Moreno83. I replaced the SC board after work today and the TV is back up running again. I forgot to get the updated screws from the place I bought the board so I will get them when I return my core. By the way, 5 of the 7 factory screws on the original SC board were very loose.

I would decline to run the tv at all until you get the screws with lock washers on, also be sure to resolder the ground pads on the back of the screw holes.

I get absolutely excited every time i get one of these tv sets as they are a Very VERY well built unit with the repairs and the picture quality is amazing. I have 4 years and counting on a set of the exact same model i repaired, And i just got a 50 inch of the same model for free with the same issues and i cannot wait to fix it and put it in my bedroom, replacing a modern LED lcd tv.

[Elevatorguy4]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Thanks JeffJ. The set is running now. No getting it back from the kids once they saw it turn on. As far as the ground pads on the back of the screw holes, I used a board that was rebuilt by a local shop that specializes in audio/video components but I am not sure if they added any material to the ground pads or not. They were very familiar with the 7 blink code and stock all 3 of the related boards. I agree the picture quality is amazing. The only sets I remember looking slightly nicer, but not a better value, at the time I was shopping for this one were the Pioneer plasmas. Those Kuro sets were incredible and probably remained the holy grail until the OLED sets became relatively mainstream a couple of years ago.

[JeffJ]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Thanks JeffJ. The set is running now. No getting it back from the kids once they saw it turn on. As far as the ground pads on the back of the screw holes, I used a board that was rebuilt by a local shop that specializes in audio/video components but I am not sure if they added any material to the ground pads or not. They were very familiar with the 7 blink code and stock all 3 of the related boards. I agree the picture quality is amazing. The only sets I remember looking slightly nicer, but not a better value, at the time I was shopping for this one were the Pioneer plasmas. Those Kuro sets were incredible and probably remained the holy grail until the OLED sets became relatively mainstream a couple of years ago.

The only reason i would decline to run it is because the SC board seems to resonate at a pretty high frequency, and it may end up depending on how many hours you put on it until the new screws witch lock washers come (or you go to a hardware store and purchase lock washers to install). The screws may back out enough to start blackening the solder ground pads on the back of the board on the screw holes again, as they do as it starts to ark a bit.

[Elevatorguy4]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

I should have them either tomorrow or Wednesday. As far as how I tested the buffer boards, either that way works or I got lucky. I do see more logic in the way you described though, as you're checking each line of output for a short.

[Moreno83]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Good job that you fixed it with a new board. The lock washer screws is just to be extra sure the board "won't" fail in the future. The panel is designed to play a minimum of 100.000 hours so if your happy with the tv make sure you get some extra parts as a mainboard before they disappear.

Anyways the normal screws will work also. Just make sure the ground pads on the back of the board are resoldered. They are probably black because of the arching.
Just tighten the original or lock washer screws on ALL boards. The SS board and C boards on the bottom will be loose also. I don't get it why they didn't tighten them from the beginning causing these problems.

I got a few repairs done with the original screws and these tv's are still running for a few years. Watch out with the lock washer screws. Some of panasonic lock washer screws will destroy the screw holes.

Enjoy your tv!!

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

I'm new here just searching for some ideas. Been struggling with a 50 Panasonic myself and a faulty SC board. Swapped out parts with parts kit worked for 2 hrs the 2 loud pops and it went dead. Obvious resistor at R60 gone but no clue of value to replace. Also HD a transistor come loose from the board.

[Moreno83]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Then you probably used fake parts. Wat resistor blew? Resistor on the leftist of the big capacitors?

Please take some pictures.

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Then you probably used fake parts. Wat resistor blew? Resistor on the leftist of the big capacitors?

Please take some pictures.

R601 is the one I know blew. Q402 also up in smoke.

[Moreno83]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Yes those resistors and diode ( and probably more ) blow because of fake/bad parts. What's that part? ID20AK? Never heard of it.......

Where did you buy the kit??

[Moreno83]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

FGB20N60 is the part --> 600V, 20A, 2.2V, TO-247

30F131 is the original --> 360V 200A / TO-220

Im not that good in reading those data sheets but thats a big difference. I don't think its a suitable replacement part for your board.

[petehall347]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

FGB20N60 is the part --> 600V, 20A, 2.2V, TO-247

30F131 is the original --> 360V 200A / TO-220

Im not that good in reading those data sheets but thats a big difference. I don't think its a suitable replacement part for your board.

t0-220 wouldn't fit there ..
neither would a TO-247
more likely a TO-263
had a quick look at data sheets and was confusing ... igbt versus mosfets ... ..
just get genuine original parts .they are available .

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Anyone know about the resistor at R601. Where do u like to buy oem parts?

[JeffJ]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Anyone know about the resistor at R601. Where do u like to buy oem parts?

You're in the states, use shopjimmy.com they ship repair kits and are reputable and vouched for by hundreds here.

You might be looking at a new sc board tho that could have blow a ton of stuff.

Where did you get that kit from though link us, so others know not to trust it.

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

I bought the parts from Amazon and they were supplied by ShopJimmy

[JeffJ]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

I bought the parts from Amazon and they were supplied by ShopJimmy

You must have ordered the wrong kit then, that IGBT is not part of the kit for this model.

What link did you buy? post it.

I cannot find any listings at all on Amazon by ShopJimmy for repair kits.

Edit: I found them, didnt show in their listings when i browsed their shop

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

https://www.amazon.com/gp/aw/d/B00KT...?ie=UTF8&psc=1

[JeffJ]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

https://www.amazon.com/gp/aw/d/B00KT...?ie=UTF8&psc=1

That is indeed the correct kit, that part that you replaced however, is not for the board, also i dont recall this kit suggesting to replace D604, i could be wrong tho.

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

I'll list the parts I swapped per kit instructions as soon as I'm home. Thanks for the help so far

[Pomeroy]

Re: Yet Another TC-P55GT30 7 Blinking Light Error

Q421 Q442 Q423 Q403 Q402 Q401 D401 are the ones I swapped out. There was a resistor beside each one except D401 that was changed out