Re: Panasonic PF50G20S blinking 13 times
Thanks for the suggestions! I unfortunately won't be at his place for the next month or so but I also had the feeling that it could be something warming up too much, then a safety kicking in (hence having to unplug for a while for things to start working again).
Baking the A board was on the list of possible ideas (reballing an IC is probably above my competences even if I'm very good with a soldering iron). Possibly also, re-ironing most of the solder joints around it.
More generally speaking, is there any systematic...
CoinCoin88
Member
Last Activity: 07-03-2023, 03:45 AM
Joined: 11-28-2014
Location: Paris
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Panasonic PF50G20S blinking 13 times
Hello there,
Google led me again to badcaps when trying to troubleshoot a dying Plasma that is sitting at my uncle's roughly 550 km from where I am. It's an old G20 from 2010 or so, that isn't being actively used so you can consider the panel "not too sollicitated".
Symptoms: TV starts, works for 5-10 minutes, then screen turns black and safety kicks in and spits a 13-blink code with the red LED. Once this code kicks in, the TV will not display any image anymore. Unplug it for a few minutes, plug it again, it'll work then fail a few minutes later.
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
indeed, SC2. I did not have the ref in my mind and had to guess
Obviously no short is not a guarantee that everything is fixed, but it's a good start...Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Hi,
I did not test Q531 the way you described (I just did mine as tw2005 suggested). You can always check on the one you'll get with th repair kit if it reads shorted between the legs you describe. If it doesn't, assume the one on your board is fried. If it does, well, it's just like yours on the board, so it's probably normal.
A good indicator of correct repair is that there is no short anymore between both input pins (SC20)Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
There were no screws in the kit (but I knew that prior to buying it). I did not have any washers at disposal but I'll probably add some soon. What i did is add some threadlock before mounting all screws back. I'll probably add washers in a near future and put some threadlock again.
Anyway, it's working, at a fairly low cost, and I've also got the new board I found at a good price, waiting in a drawer. So I'm prepared for (nearly) anything :-)...Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
A little update: I've received the repair kit from the UK. I replaced all 6 blow MOSFETs and 1 diode (DAF30A) which showed a significant difference in Vdrop with the new one.
I tested all combinations of legs for the 2 small SMD components (Q5xx and IC701), they were similar between previous and new ones, so i decided to give it a go. The TV works like a charm!
Thansk for your help, especially tw2005 ;-)Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Well, the fix is not "so" rigorous... I have no clue as to where to find a retailer that will fix it (I live in France), but I've seen some offers on eBay for "repair services".
However if you're steady and have a proper soldering iron + multimeter, you could at least diagnose where the error is coming from. Most likely SC, but you could at the very least check that.
Read my previous post and other interventions here, you'll find plenty of information to get started.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Hi,
If you go through the last 4 pages, I think you'll get all the information you're looking for.
First step would be to open the TV (~30 screws on the back pannel) and inspect the SC board, located on the left side (rear-facing the TV), along with SU and SD board (left side, along the edges).
Remove the SC board by disconnecting the 3 clips (left) and the ribbon flex cable (right) and unscrew it. You're looking for (tiny) burn marks on the other side of the board, around the screws that attached...Last edited by CoinCoin88; 12-08-2014, 04:48 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Thanks for clarifying. Anyway, kit purchased from UK seller, will see how it goes when I get it, hopefully by next week.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
I've tested everything again from drain to gate and drain to source, as you suggested. Before that I had absolutely no clue of how a MOSFET (ar any transistor, actually) worked. Going through some datasheets help me understand that (and why to test from 2 to 1 and 3). The 6 shorted igbts are short from gate to both source and drain (tested in diode mode, cotinuous beep for 1-2, 2-3, 1-3), so they're really dead short. I'll replace them asap.
Q531 seems fine (tested yesterday as you suggested), and IC724...Last edited by CoinCoin88; 11-30-2014, 08:31 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
By max value I meant it showed 1 when set to 2Mohms. So it's more than 2M at least. I'll measure the way you described later today. I'll buy a lot and get started with it when I receive it....Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
unfortunately the one i have here stops at 2Mohms... I might get a hand on a better one at my friend's shop though.
edit: tested with 2M setting, it's stucl at max value. So I don't know if it's 3 Mohms, but it's more than 2, which is a good start
edit: for the 178m05 I was measuring the same way as igbts. This probably makes no sense anyway so I'll live this one aside for now. I'll grab a repair set off eBay, this seems like an affordable option. best case scenario I end up with a repaired board that works...Last edited by CoinCoin88; 11-29-2014, 11:46 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
That I know. When I mount a board back in my TV (either a new one or this one hopefully fixed) I plan to add some metallic washers to the screws and loctite to secure them.
Here are my measurements so far. In red are what I believe is shorted. I'm actually sure 30F131 and RJp30H2A are dead short (that make for 6 igbts).
As for the diodes, I'm gonna test the way tw2005 just told me and report back!
(Red: supposedly dead / blue: supposedly OK)
edit: testing from leg...Last edited by CoinCoin88; 11-29-2014, 11:01 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
I've managed to disconnect all pins of shorted MOSFET. Added a bit more solder to it and they went away smoothly.
Diodes still appear shorted although I'm not sure what they should read. Good thing is after disconnecting all 6 shorted mosfets (3 30F131 and 3 RJP30h2a) sc2 shows 150+ kOhms, so it's not shorted anymore. I've soldered cms components long ago, a bit hard but I pulled through, so I'm probably going to buy a repair kit and see how it goes. Anyway, without that the board is fried so...!
I've also...Last edited by CoinCoin88; 11-29-2014, 09:07 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
As for lifting both legs, I've been trying for the past hour. Not sure why but solder at pin 3 never melts whereas there's no problem for the first one.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Tnpa5335agLeave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Well i'venlifted one pin for each shorted igbt and i stil see sc2 shorted. This doesn't soundtrack so good...Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Yep I'll use a blade to life them slightly and see if sc2 is still shorted. I'll check in the 2011 guide if there's a way to test the buffers. First things first, let's see after lifting the shorted igbt legs if sc2 is still shorted.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Ok so basically I'm heading in the right direction, at least for now. I'll try to lift the pins of these shorted igbt, and see it it fixes the short in sc2. If it does, I'll just replace them and proved afterwards with isolation tests. Coil your confirm that it's the right approach ?
Thanks for your help, I've read a couple posts on this board and you always seem to come up with valuable intel!!
Edit: to test the buffers, should I refer to this post ([url]https://www.badcaps.net/forum/showpost.php?p=394570&postcount=15[/url])...Last edited by CoinCoin88; 11-29-2014, 02:45 AM.Leave a comment:
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Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted
Hi guys,
Newcomer here. Domed by the infamous 7 blinks last Tuesday while watching Star Wars. No need to say I was pissed. As a good friend of mine is into video business (more like furnishing complete sets for TV or cinema). I asked him for help. While his tech was at it I rapidly found about the sc (and possible su/sd) defects. Today he told me exactly the same thing, and that he was trying to find a good deal because the complete sc board is around 200 euros. Bummer... (It's a p50gt30).
I took the...Leave a comment:
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