Panasonic TC-P50G25 10 blinking light failure.

[ecdm98]

TV is just over 3 years old. Was going to bed and turned off TV using the power button on the TV and it made an unusual noise. Did not try to turn on tv till the morning and it gave the 10 bliking lights. I have gone through the technical guide for this series and have checked for the shorts.

P11 - pin 1 - 1.4 kohms
p11 - pin 4 - 13 kohms
p35 - pin 1 - 20 kohms

I also followed the flow chart to diagnose 10 blink failure which after checking for shorts says to disconnect SC20 and powered up tv and I still had 10 blinking lights which suggest to replace A board.

Does this seem like the proper conclusion or am I missing anything?

Thanks,
Eric.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

TV is just over 3 years old. Was going to bed and turned off TV using the power button on the TV and it made an unusual noise. Did not try to turn on tv till the morning and it gave the 10 bliking lights. I have gone through the technical guide for this series and have checked for the shorts.

P11 - pin 1 - 1.4 kohms
p11 - pin 4 - 13 kohms
p35 - pin 1 - 20 kohms

I also followed the flow chart to diagnose 10 blink failure which after checking for shorts says to disconnect SC20 and powered up tv and I still had 10 blinking lights which suggest to replace A board.

Does this seem like the proper conclusion or am I missing anything?

Thanks,
Eric.

No, there's another Panasonic TC-P50G25 10 blink thread yesterday you can have a look at it.

before you race off and get an A-board I would disconnect SC2 and measure the resistance across those pins at SC2.

P11 pin 1 is Vsus and should be much greater than 1.4k, I get 1 Mohms on my Tv.

disconnect SC2 and redo the resistance check with p11 connected to SS11.

You could also check the transistors on the SC mounted on the heatsinks for short. Q661 is one that normally goes bang along with others.

Bad SC is a common failure and can cause SOS 4 & 10.

[Noobomatic]

Re: Panasonic TC-P50G25 10 blinking light failure.

ive got a panasonic viera i picked up for cheap & repaird even cheaper, had the 10 light blinking blah blah , its the 15v rail fault i belive (dont quote me) theres a little chip on the board for the 15v rail i cant remember off hand but you remove a 1uf smd cap and then the tv should fire up again http://i1179.photobucket.com/albums/...IMG_3251-2.jpg thats a picture of what you may be looking for if you own a plasma, get some freeze spray ( i used butane) crazy i know but i blew away the flamable gas anyway that worked for me to remove the tiney capacitor and tv worked fine there is 2 of them on the power supply board, posting pics of your boards would help alot more.

[tom66]

Re: Panasonic TC-P50G25 10 blinking light failure.

Completely different TV.... I've done a few of those and they are easily fixed but unfortunately it's not so easy on these sets.

[ecdm98]

Re: Panasonic TC-P50G25 10 blinking light failure.

I really appreciate the help and have to make a correction from my first post were i mixed up the numbers.

p11-pin1-(Vsus) - 200kohms+
p11-pin4-(P15V) - 1.4kohms
p35-pin1-(Vda) - 250kohms

I also disconnected SC2 and measured across those pins and got 28kohms and then with SC2 disconnected.
p11-pin1-(Vsus) - 400kohms
p11-pin4-(P15V) - 1.4kohms

I didn't have time to measure the transistors yet.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

I really appreciate the help and have to make a correction from my first post were i mixed up the numbers.

p11-pin1-(Vsus) - 200kohms+
p11-pin4-(P15V) - 1.4kohms
p35-pin1-(Vda) - 250kohms

I also disconnected SC2 and measured across those pins and got 28kohms and then with SC2 disconnected.
p11-pin1-(Vsus) - 400kohms
p11-pin4-(P15V) - 1.4kohms

I didn't have time to measure the transistors yet.

To eliminate PSU & A board

try disconnecting the 3 white ribbons at the A board, disconnect P2,P11, p35 and power up.

Should turn on and stay on and then you can probe the voltages

Confirmed normal results are:

stay on for about 30seconds, after which it shuts down and gives me 4 blinks.

Read this if not already.

https://www.badcaps.net/forum/showthread.php?t=36183

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

To eliminate PSU & A board

try disconnecting the 3 white ribbons at the A board, disconnect P2,P11, p35 and power up.

Should turn on and stay on and then you can probe the voltages

Confirmed normal results are:

stay on for about 30seconds, after which it shuts down and gives me 4 blinks.

Read this if not already.

https://www.badcaps.net/forum/showthread.php?t=36183

SC2 gives 300K - 2M, 28k is too low

[NJRoadfan]

Re: Panasonic TC-P50G25 10 blinking light failure.

Bumping this thread,

I have a TC-P50G25 (US model) here with the 10 blinks code on power on.

Using the diagnostics PDF found here, I determined the TV has a short in the P15V line (reads 15-20ohms on my meter). Following the P15V flow chart, removing the SC20 ribbon cable resolves the short (meter jumps into the k ohm range), which Panasonic indicates is a failure of the SC board.

Testing Vsus reveals no shorts, and testing across the SC2 connector reveals no shorts as well.

Does this definitely point to the SC board as being bad? I'm looking for some confirmation before I send the board out to be repaired as this doesn't look like the same common failure these boards tend to suffer from.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

Bumping this thread,

I have a TC-P50G25 (US model) here with the 10 blinks code on power on.

Using the diagnostics PDF found here, I determined the TV has a short in the P15V line (reads 15-20ohms on my meter). Following the P15V flow chart, removing the SC20 ribbon cable resolves the short (meter jumps into the k ohm range), which Panasonic indicates is a failure of the SC board.

Testing Vsus reveals no shorts, and testing across the SC2 connector reveals no shorts as well.

Does this definitely point to the SC board as being bad? I'm looking for some confirmation before I send the board out to be repaired as this doesn't look like the same common failure these boards tend to suffer from.

Ok, so you know how to use a meter. On the SC board, locate Q661, smallest heatsink 2 transistors mounted, check the RJP63F3a IGBT and see if it's shorted usually all 3 pins.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

Alternate to the above, TV off, disconnect, Sc2,SS11, P35, remove the 3 white flat ribbons on the A board. turn the Tv on as normal, if it strats up normally and no blink codes, A and PSU are good, Vsus at P2 could be checked (200v) and any other voltages, if the optical jack on the A board is lit red, that would mean it's running too. Only leave it on long enough to check, 30 secs or less. don't do what someone else did and leave it running , it will eventually fail and go 4 blink. manual says no more than 30 secs.
there will be no display, some expect to see something.

Don't reconnect any power cable especially p35 for 5 mins or zap and could spike panel which would be very bad and terminal

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

Shorted 15V line at Sc20 will be a failed FET driver IC, IC521

What resistance did you get at SC2?

[NJRoadfan]

Re: Panasonic TC-P50G25 10 blinking light failure.

Shorted 15V line at Sc20 will be a failed FET driver IC, IC521

What resistance did you get at SC2?

I'll double check tonight, but I recall it was pretty high, in the mega ohm range. I have the SC board pulled out of the set already, so testing Q661 shouldn't be a problem either.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

I'll double check tonight, but I recall it was pretty high, in the mega ohm range. I have the SC board pulled out of the set already, so testing Q661 shouldn't be a problem either.

Ok , well I guess I won't hang around waiting, it's 1241am here, I'll check where you're at when I get up

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

That can happen, if it went low enough you'd have 4 blinks, have read with people at 10 then 4 maybe if the board keeps getting powered it may short it more. self repair is not impossible but I think you have rev Ap which is a little cheaper at modus but they should be the same cost.

Actually looks like it's AF rev. Either will work in this set

[NJRoadfan]

Re: Panasonic TC-P50G25 10 blinking light failure.

The set definitely has the AF board. Anyone here use modus to rebuild their board? I haven't come across any reviews of this company's services.

[NJRoadfan]

Re: Panasonic TC-P50G25 10 blinking light failure.

Resistance on SC2 tests 1.5-2 mega ohms.

Q661 tests as follows
E-G = short
C-G = open
E-C = short

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

The set definitely has the AF board. Anyone here use modus to rebuild their board? I haven't come across any reviews of this company's services.

Quite a few have and most reports are good. I think I've read of one return on a different SC board that came back still faulty. Some take the time to report it here.

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

Resistance on SC2 tests 1.5-2 mega ohms.

Q661 tests as follows
E-G = short
C-G = open
E-C = short

So obviously we're talking dead short cct. Usually it goes dead short on all 3 legs but if it's dead shorts, yep it's a goner

Other victims are DG402RP,DG502LW,30F125,45G128.

Did you try the other test and have it turn on with no 10 blink?

If you have not read and interested, over 200 posts of TNPA5081 repair

https://www.badcaps.net/forum/showthread.php?t=26322

[NJRoadfan]

Re: Panasonic TC-P50G25 10 blinking light failure.

I haven't tried the other test yet, but its a bit late here now to rip apart the TV again. As for repairing it myself, I really don't have the patience, plus my surface mount soldering skills are umm.... a bit lacking. I'm also afraid of pulling traces on this PCB, it feels like its going to break by just picking it up!

[tw2005]

Re: Panasonic TC-P50G25 10 blinking light failure.

I haven't tried the other test yet, but its a bit late here now to rip apart the TV again. As for repairing it myself, I really don't have the patience, plus my surface mount soldering skills are umm.... a bit lacking. I'm also afraid of pulling traces on this PCB, it feels like its going to break by just picking it up!

Fair enough. Yeah I'd like you to try that test and check out some of those other parts to be sure but if it was a dead short 0 ohms on Q661 it's the SC.

If you checked the P15V at the P board and it was short and cleared with Sc20, that would be good enough for me.

I forget if you have but resistance test the Sd/Su boards before you fit a working SC board, they can fail and I've had one with shorted SC/SD/SU all together.