Panasonic TC-P50S30 7 Blink

[n3lka]

I just picked up a TC-P50S30 that had 7 blinks. After reading all the threads out here, I was able to get the screen on after disconnecting the SU and SD cards and jumpering SC50 on the SC board.

I tried the SU and SD one at a time, but still got the 7 blinks. Does this mean the SC board is maybe ok, and the problem is the SU/SD set?

Thanks,
Brian

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

generally speaking if the TV turns on with Sc50 jumped and no blinks and the onboard LEDs are lit on the SC then it's a pass.

When you tried SU/SD on their own was Sc50 jumped? If not SOS7 will trigger with either of those disconnected.

I personally would rather resistance check those than risk using the SC50 jump and having a bad buffer board blow the SC which can happen. Not sure if this series is immune to a buffer blowing the SC but on a 2010 I shorted out a SC attempting to run it with shorted buffers.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Thanks for the reply as always.

I don't see any onboard led's on this SC, physically. No major shorts on the buffers that I could find with my trusty old fluke 77. But the test with the both su and sd, sc50 was jumped. When I tested su and sd one at a time connected to the sc, sc50 was jumped. I'll pop out the sc board and double check it again though just to be sure. I'm wondering why both boards would be bad, maybe a few bad assorted chips.

Everyone's out of stock of the su and sd, and on ebay there's just an su I believe. I did see a guy selling a whole set, sc, su and sd, but for like $180. This one can sit against the wall until I find cheaper parts.

I still can't get over how panasonic doesn't offer extended warranty for this model. I heard a lot of bad stories associate with this model. Although the panasonic picture is outstanding when they do work.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

So when you say got the screen on with SC50, what exactly did you see with the buffers removed?

If the TV was on and SC50 was jumped and it passed/running you would have seen a green LED shining D583 on the SC board. I can see it in the photo. It is located below the 2 blue polyester caps near the white optocoupler.

The SS board LED too would have been lit, D254 located also below the 2 blue polyester caps near the white optocoupler on a TNPA5357AM SS board.

You may be waiting a quite some time for cheap boards given their demand.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Ok, I got the led's on both boards green.

What happens with the su and sd out of circiut is the front panel led, stays solid red, and the HV stays on instead of dropping out, and as I mentioned above, I have the green led's on the sc and ss board.

As far as the wait, I picked this set up for $50. So I can gets a few more set out the door to pay for parts..

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

try this and post up the results.

On the SD,SD42 measure the following resistance with respect to the gnd plates on the board. This is with them disconnected from the SC.

Pin 6 VF_5V
Pin 1 VFO
Pin 2 Vscn_f

On SU41

Pin 2 VF_5V
Pin 8 VFO
Pin 6 Vscn_f

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Not to sound stupid, but were you referring to the HV plates? I can't see any common on the two boards. There's some commons from the sc going in on sd46. But it seem slike a bad common for the sc and su.

However, I measured from the points you gave me to the HV plates, the readings are (in ohms)

sd42

pin 6 1.2M
pin 1 5.6M
pin 2 10.5m

su41 (looks to be a culprit)
pin 2 9.6
pin 8 55
pin 6 1.89M

From the gnd that goes in on sd46, all pins are open.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

Not to sound stupid, but were you referring to the HV plates? I can't see any common on the two boards. There's some commons from the sc going in on sd46. But it seem slike a bad common for the sc and su.

However, I measured from the points you gave me to the HV plates, the readings are (in ohms)

sd42

pin 6 1.2M
pin 1 5.6M
pin 2 10.5m

su41 (looks to be a culprit)
pin 2 9.6
pin 8 55
pin 6 1.89M

From the gnd that goes in on sd46, all pins are open.

yeah, so the grounding plates where the screws go.

don't understand what you're saying about SD46, 9.6 ohms on the 5V is definitely bad so too 55ohms on Vscn_f.

Ironically 1.89M is what I expect on Vfo or at least on a 2010 FHD buffer that's what mine are.

As for the SD, the results are quite high? This can depend on the polarity of the leads.

Could you try that one again in both polarities and also disconnect the ribbon between the 2 boards just in case it affects anything.

These are typical results for my buffer and I expect these will be very similar for these. Do me a favour and keep the name tag in the results, I don't remember pin numbers well.

VFO 2.2M

VSCN-F (TPSC1) 221K

5V_F 5.7M

your results

Pin 6 VF_5V 1.2M
Pin 1 VFO 5.6M
Pin 2 Vscn_f 10.5M

No low ohms so that's a good start.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Getting eronious high readings either polarity, probably due to a cap charging up.

SD46 has a couple of connection going to chassis ground through the SC, it's the second connector on the SD. The SC isn't connected as you said for all these tests.

The readings on SU41 were a bit low.

Do these cables pull out after unlatching the lock. I popped up the latch and the cable are still in there pretty good, I didn't want to pull too hard. Maybe I'll wait for the replacement to show on how those cables come out. I pulled other ribbons out on other models, especially samsungs, but never a panasonic.

I managed to find a set of boards on craigslist from a guy with a busted panel. I just hope the boards didn't get damaged when the display broke. $35 for the set including shipping. I paid via paypal, hopefully the guys honest, since it wasn't a local deal, but with paypal, if they don't show, I can get my money back. I used searchtempest.com to search craigslist, it pulls results from all over.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

Do the same resistance check before install. A cracked/shorted panel can kill the buffers if it was on when it cracked. i have purchased a set from a 3D Vt20 model, the Sc was ok but the Sd was shorted, Su ok so there's a chance of getting bad buffers. Don't install blindly, you want to make sure you preserve the SC as they asre even harder to get and costly.

With mine 12 months ago you could bet a SC easily and $50-70. Now almost impossible to get or $150 upwards. I managed to work out how to repair those and have a couple spare to cover me with my TV.

If you're referring to the panel ribbons. yes they wedge in a bit. They will pop out but I use 2 fingers either side and gently pull back straight, maybe a little wiggle but I guess you want to control it in such a way so that when they do break free, your wrist does not go flying backwards and tearing the ribbon. Lift latch fully.

Putting back in, reverse, they slide in easy then just a little bit further they'll wedge in. Usually there are markers to judge they are in and straight.

Most of us have had to have a couple of goes judging by other posts but it's a feel thing. First time I did one of these it took a couple of goes, but now I can get it first time.

If you do need to reseat, do it with the TV off! A few have made the mistake doing it with panel on and you will blow both the buffer and good chance the Sc as well.

I was having a look at the P0GT30 buffers, I reckon they would work too and only thing I can see are the heatsinks that make this different. None on yours. this is similar to the S20 & G20 models which my is an equivalent, the heatsinks are on the G20. Can't gve you 100% promise but that is what my eyes and gut are telling me.

If you get high boths ways, it might still be ok for that buffer, but the low one , I'd say is gone.

Might also be worthwhile just checking the 5V reg on the Sc that feeds VF5v to these. IC724, next to the SC46, SMD IC. I've had one of these bad with a buffer set with shorted 5v at the buffer.

GND-pin3 should be around 2.6K. also check pin 1-3 is not shorted. I've also had one where the first test was ok but later found 1-3 was short so no longer a 5V reg and allowing the 15V to go through. 15V in on 1 and 5V out on 3

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Thanks, I'll give it a go. I'll make sure to check the sc board and the newer su/sd boards. The guy has the sc board as well. Maybe I should've bought the whole set. If the two boards show up and work, I'll ask him for the sc board price.

I was thinking of adding my own heatsinks to it, using the chipset heatsinks and tape for pc's. I'm wondering if that's why they fail as often, having no real heat dissipation.

I may wind up keeping this tv, I always wanted a "smart" tv. Although my 47" insignia lcd has a nice picture.

I'll post results when the new boards show up, and as always, thanks for your help.

Off the subject, do you know anyone who has a TNPX25JIGS for a TH-42PX25. Having the 480 issue. If not, I'm going to spring for a replacement DG board, and hopefully the replacement has the newer firmware.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

Thanks, I'll give it a go. I'll make sure to check the sc board and the newer su/sd boards. The guy has the sc board as well. Maybe I should've bought the whole set. If the two boards show up and work, I'll ask him for the sc board price.

I was thinking of adding my own heatsinks to it, using the chipset heatsinks and tape for pc's. I'm wondering if that's why they fail as often, having no real heat dissipation.

I may wind up keeping this tv, I always wanted a "smart" tv. Although my 47" insignia lcd has a nice picture.

I'll post results when the new boards show up, and as always, thanks for your help.

Off the subject, do you know anyone who has a TNPX25JIGS for a TH-42PX25. Having the 480 issue. If not, I'm going to spring for a replacement DG board, and hopefully the replacement has the newer firmware.

No, too old for me. Only started a couple of years ago tinkering with these as a hobby. now i have nothing to fix because I'm in a remote locality and rarely see anything to salvage.

Not sure if heatsinks are a big issue but most electronic devices last longer if run cooler. usually it's the Sc that quits first so if you are keeping it and you can get the other reasonable I'd buy it. I took the opportunity to get in and keep some spares for mine because it was just a matter of time before they ran out.

anyone can replace a board and throw it out, at some point though cores run out and component level is the only option which is about where my board is at.

I sold all the stuff I fixed but kept the good stuff (Panasonics) started out with 2007/8 HD then when I landed my 14 month old 2010 for a $100 and then fixed for another $100 I sent the older ones on their way.

Unfortunate that although the Panas are good, they seem to have a lot of Sc issues from 2010 on but i think they all do except a panasonic panel seems to last very well with nil maldischarge as they age where i really don't like the old samsungs and Lg I thought were worse.

I'm very biased towards the panasonic, but alas no more plasma from them now.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

Sorry, I thought the suffix jig was unusual, did not realise it was a service jig. It looks like something that could be made if you can get more info. Do you know which EEPROM is being written to?

Is it a chip that could be removed and order a replacement from panasonic although it would not surprise me if no longer available.

Since this is a known issue I wonder if panasonic would provide this update free via a service agent?

just some ideas .

I assume you have this doc since you are asking about the jig.

Also i'm reading that TNPEEPJIGS and TXNPX25JIGS are subs but probably also no longer available.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

I saw you replied in the other thread, I'll pick up the 480 issue there. Maybe others can benefit....I hijacked my own thread lol.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

I checked the regulator, a first I was like whoa! I was using chassis ground instead of the HV. After using the hv as a common, I got 5 volts from it, so that looks good.

Yah, I like the component level repair stuff myself, but if I can find parts cheap enough, I'll do the swap out. My problem is at least with a lot of these smd chips, I need to get a better setup for working on them, like a cheap hot air station. I have a heat gun for reflows, but that's about it. All my other stuff is a standard station and solder sucker and wick.

If the replacement su and sd work out, I will get the sc form the same guy. Even if I don't keep this panny, I can keep it as a spare for another repair later on down the line.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

I checked the regulator, a first I was like whoa! I was using chassis ground instead of the HV. After using the hv as a common, I got 5 volts from it, so that looks good.

Yah, I like the component level repair stuff myself, but if I can find parts cheap enough, I'll do the swap out. My problem is at least with a lot of these smd chips, I need to get a better setup for working on them, like a cheap hot air station. I have a heat gun for reflows, but that's about it. All my other stuff is a standard station and solder sucker and wick.

If the replacement su and sd work out, I will get the sc form the same guy. Even if I don't keep this panny, I can keep it as a spare for another repair later on down the line.

I did total repair on mine with 2 soldering irons, it was a challenge.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

Got the new SU/SD boards, no go. I'm wondering if the SC is bad too. The guy I bought them from said the donor had a broken display. I'm wondering if it took out the chip. Although, it looks like the same exact chip was bad.

I didn't check before putting them in, I'm also wondering if the display is shot causing shorts to the su/sd. The display isn't cracked, but it looks like I'm getting shorts between the hv and the output pins on su1 and some on su2.

I got them dirt cheap, so no guarantee against doa...oh well.

[tw2005]

Re: Panasonic TC-P50S30 7 Blink

Cracked screen with TV on, good chance it shorts the buffers. I always love the from working TV, broken screen lines in ebay. tested etc

I got some boards from a VT20, cracked screen. I knew the risk. Was not surprised or disappointed when I found the SD shot.

[n3lka]

Re: Panasonic TC-P50S30 7 Blink

At this point, I may just part it out. With parts hard to find and expensive on this one, I may just sell the main and power supply boards. Or jut list it for the $50 I bought it for for a parts donor on Craigslist, with the history included.