Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

[Shinju]

Hey friends,

I snagged one of these units super cheap, it appears to be in pretty good condition other then the stand has a small chunk of plastic broken off.

Anyway when I powered on the unit the red LED was solid then started to blink 3 times pause, blinked 3 more times so on and so on.

This error code points to the A board (main board) being the fault.

Now my question is, The only place that I can find the main board is ModusLink PST and they want 198.00 for it, being that they have a 35% off sale till after the 4th it brings it down to 125.00.

I have not taken the back off and I probably will not have time till I get back on Sunday, I don't know the exact model number of the mainboard but there only appears to be one for this unit and that's what makes it so hard to come by according to Moduslink.

I just want to know before I pull the trigger on this, with a 3 red fault Panny could there be other issues that would case the main board to fault? I did not see any cracked on the screen proper or on the edges and corners.

My budget on fixing these units usually is around 50-60 a little more depending but this is a huge risk for something I know nothing about its history.


I know this is a decent unit and probably worth fixing but I have yet to dive into a Panasonic.

Thanks in advance and sorry for the shooting in the dark questions!

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

try disconnecting A31,A32,A33,SC2,SS11,P35 and turn on. See if it still SOS3. Let the power bleed off before you reconnect SC2,ss11 and P35 so nothing gets a spike.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

try disconnecting A31,A32,A33,SC2,SS11,P35 and turn on. See if it still SOS3. Let the power bleed off before you reconnect SC2,ss11 and P35 so nothing gets a spike.

I will do that when I get back from our weekend getaway, I went ahead and ordered the board anyway since it was 35% off and if the panel ends up being toast I know I can sell the mainboard as they are highly sought after being that its the ONLY main board for this panel no substitutes at all.. or return it for 20% restocking fee if needed.

Thanks!

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

So I got the new mainboard in today, and. Hooked it up and I got 3 blinks with a quick Bzzzz from the ps.

Then I disconnected all the things above and when I powered the unit on I got a solid red LED.

So something else must be bad, what do I do next?

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

If I plug everything back in minus SC2 and a33 I get 6 blinks.

Everything attached minus SS11 I get a Bzzzz from the ps and a 5 blink.

Everything all connected I get a bzzzz and a 3 blink.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

/bump

Here is a photo of the area on the PS were the Bzzz comes from.

I have a video but having issues uploading it to the tube.

Basicly it goes like this, plug the cord in, relay click, turn the power on via the button another rely click a Bzzzz for 1.5 seconds then another click and then SOS 3 with all boards attached.

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

I'm thinking shorted SC board? So with all those things disconnected, was the TV running? does this have fans, were they running? Did you by chance measure vsus etc and confirm if the TV was running or not?

Maybe check out the Sc for shorted IGBTs or check resistance on the SC2 Vsus rail also 15V and 5v lines on the SC also.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

With all those things disconnected the tv (red light) was solid, I don't recall the fans coming on at all. I can easily go back down and disconnect and try again.

The ps buzzing is strange.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

Everything disconnected and turned in the fans come on a second after the power button is pressed. Solid red LED.

Power supply doesn't buzz in this state at all.

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

Everything disconnected and turned in the fans come on a second after the power button is pressed. Solid red LED.

Power supply doesn't buzz in this state at all.

If the fans are on then the TV is running. That confirms that whatever is going on it's not he PSU or A board. If you probed the PSU in that state you should be able to confirm all the voltages are good.

You only get buzzing with the SC so I think it's shorting the PSU. SC board failure in G10/15 is fairly common. 3 & 5 blinks are triggered on the A board so the issue is external to the A board since you got no blinks, shorted SC boards can cause a number of other SOS to trip.

looking at the picture, T201 produces vsus, i assume that is where you're talking? Check SC2 for short cct.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

With everything disconnected, p2 is seeing 181-185p11 is seeing a steady 191

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

4 on p11 is reading 15.7v

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

With everything disconnected, p2 is seeing 181-185p11 is seeing a steady 191

Strange 181 on P2, 191 on p11. Both are vsus so should be identical.

P2 and p11 are tied together, maybe dirty connection.

I think this will be bad Sc board, should be able to find somehing shorted on that like the IGBTs.Would not hurt to check out the SD/SU buffers too before replacing the sc if it's bad.

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

Do you have the 2009 Troubleshooting guide? you mentioned SOS5 at once point, if you look at that it talks about chirping noises from the PSU and first step is checking shorted SS11 or Sc2. SInce the 5 blink was with SS11 disconnected, that makes it certain it's not the SS, leaves SC as first checkpoint of short at Sc2.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

So everything connected and a disconnected SC2 I get SOS 7 no power supply buzz.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

With all plugs/cables connected, turn on, relay click, PS buzz, click and SOS 3.

[tw2005]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

With all plugs/cables connected, turn on, relay click, PS buzz, click and SOS 3.

Well i've told you what to check, SC2 must be shorted.

[johnboy1313]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

Check for continuity between the two pins on SC2

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

Well i've told you what to check, SC2 must be shorted.

You did and I am very appreciative of your help my friend. I was just going back and reverse engineering my connections to see if I was in fact getting the same errors going backwards as I was going forwards.


I am still pretty green to all these repairs I am not a professional just a guy rescuing panels heading to the landfill who sometimes adds a little money to his pocket in the process. I have actually donated a couple of the smaller ones back to the thrift shops I have gotten them from anonymously.


So being that the SC board is pretty much the culprit it looks like shop jimmy sells a kit or they did as it says no longer available/out of stock.

http://www.shopjimmy.com/panasonic-t...repair-kit.htm

I don't actually regret buying the mainboard, I got it for 65.00 off the 198 from Moduslink if I do finally get this pig powered up and running I will put the old MB back in and make sure it works and probably sell it to someone else who needs one as these boards are pretty hard to get.

[Shinju]

Re: Panasonic TC-P50G15 3 Red Blinks (need the quick and dirty) details inside!

More photo's.