Panasonic TC-P54VT25 _1 Blinking Code

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Nice! So replace D board and you've got two very nice TVs!

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

Hoooooooooo Jesus, God Damn It, OOOOOO les F**k S**t..........You guys.....


After swapping the D-Board from the 50VT20 into the 54VT25, guess waht

The 54Vt25 powered on the first tme, then off

Powered on the second time

Off-On

Powered on the third

Off-On

Powered on the fourth time

God Damn damn, may somebody bless y'all

I'm one god damn happy guy seriously

Now i'm a put the D-board back in the 50VT20

See y'all in a couple of minute

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

I'm 20 years old now. I started repairing TVs when I was 17, saw the first one (42" LG LCD) at the local tip, £20 later it was mine, easy fix (4 capacitors), got me hooked!

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

Hey guys,

Thanks for the information, i can say I know you two a little bit better and understand why you people know so much about electronic. Tom, it's funny how to talk about university, because i just give a shot at Electrical engineering, i went through a session, only one, and realize it wasn't really helpful by that time and decided to do something else.

Tw, we're interested in the same for some, '' je suis une personne qui va toujours au fond des choses et qui essaie de trouver la source du problème au lieu de s'en débarraser '' , which mean, i'm the kind of person who try to find the source of the problem and not only just try to eliminate the problem without knowing what is was.

I also studied electronics in college, here in Quebec, you go to high school, then you can obtain a technical degre in college or you may go university. I'm the one who has prefered to go to college and get a technical degre in audiovisual electronics. I just try the university this last session ( falls 2013 ) and it wasn't what i though i would be, so i drop out. by the way i'm 31 years old, i guess Tom is like 27-28 and Tw hard to guess, maybe, son't want to insult if i say it right, but around mid 40 near 50 maybe, am i right ?

I may try to find a job at a repair shop right now, i don't know why but i like junkying this stuffs. So right now i've unplug the D-board from th 50VT20 and i'm about to plug it the 54VT25 so in 20 minutes i'll give y'all the result.

See y'a back in 20 for the results. Pleasure guys.

[tw2005]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Hmm, a balmy 3°C in Leeds now, and I think that's cold.

It should work, aside from my mention of panel picture issues - but no concern if you just want to see if you can eliminate 1 blink code.

I think the fault may well be lead free solder on one of those large BGAs. The same cause as Xbox 360 "red ring of death" / PS3 "yellow light of death" and also a problem in some Panasonic gear. Shockingly common in all electronics, in fact.

I'm suspicious too and would try to prove it either way, hardware or firmware.

If this was my TV, I'd swap the D-boards and see if the the 1 blink disappeared.

If it did, I'd swap IC9001,IC9304 across to the 50" board and see if it was still ok.

If it was then that would confirm the hardware was bad on the original board.

If the fault carried across, bad flash IC but combined cost of both chips are showing for under $20USD so I'd get both to be safe.

But it's not mine and I have not played with a 3D or that D board so a fair amount of untried theory.

[tw2005]

Re: Panasonic TC-P54VT25 _1 Blinking Code

'' I think the fault may well be lead free solder on one of those large BGAs ''


I was discussing about heat and proximity of electric baseboards with the guy at the repair shop. In fact, the TV is on a TV stand and approximmitly at 1 feet of the electric baseboard. Curiously, i said to him, the problem begin when the winter came and the baseboard started heating behind the TV, 1 feet behind and 1 1/2 at height of the TV stand, so hot air is blowing IN the TV and coming out on top where the fans blow out air. I've inspected the space behind the TV and, well, -30 celcius outhere and cold temperature since decembre, the heat produce by the baseboard is HOT. Coincidence, but that lead free solder mention
made me think about that conversation and the heat produce by the baseboard.


I'll test the swap tonight and give y'all the result, right now i'll enjoy a movie i think.

By the way, what you guys do for living, Tom you look like a student and tw, '' celui qu'on appelle un solide bisouneux el'gros '', i don't know how to say this in english, the guy who's always '' junkying '' electronics.

Electronics Tech by trade who is bored silly with his job because we don't repair anything and occassionally board swap. embarrased to classify myself as a tech because I believe a true tech should be able to component level repair.

Electronics was my hobby over 30 years ago, got into the trade 20years too late regrettably.

yes i have a lot of electronic junk from tinkering. I will have a go fixing almost anything, electrical/mechanical.

Got hooked on plasmas when a colleague failed to fix his Panasonic which I got running the first night home.

Had a bunch of bad SC boards I component level repaired for the FHD series of the same TVs you talk about.

1 A board conversion I already mentioned.

They kept me occupied and challenged.

I enjoy reading this forum, try my best to help, share my experiences and promote alternate points of view. Not afraid to be wrong or sometimes goof up.

What i enjoy the most is when we get a successful fix especially if we get it at component level and have somone replace an obscure fuse on an A board for a fix as an example when the manuals and guides simply tell you to replace boards.

Resources are finite, sooner or later boards runout and why component repair is important.

I won't be replacing my TVs until I can no longer repair them or obtain parts.

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

I'm a student but I also have a job at an electronics engineering company over the summer. I'm only in university for the qualifications, really.

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

'' I think the fault may well be lead free solder on one of those large BGAs ''


I was discussing about heat and proximity of electric baseboards with the guy at the repair shop. In fact, the TV is on a TV stand and approximmitly at 1 feet of the electric baseboard. Curiously, i said to him, the problem begin when the winter came and the baseboard started heating behind the TV, 1 feet behind and 1 1/2 at height of the TV stand, so hot air is blowing IN the TV and coming out on top where the fans blow out air. I've inspected the space behind the TV and, well, -30 celcius outhere and cold temperature since decembre, the heat produce by the baseboard is HOT. Coincidence, but that lead free solder mention
made me think about that conversation and the heat produce by the baseboard.


I'll test the swap tonight and give y'all the result, right now i'll enjoy a movie i think.

By the way, what you guys do for living, Tom you look like a student and tw, '' celui qu'on appelle un solide bisouneux el'gros '', i don't know how to say this in english, the guy who's always '' junkying '' electronics.

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Hmm, a balmy 3°C in Leeds now, and I think that's cold.

It should work, aside from my mention of panel picture issues - but no concern if you just want to see if you can eliminate 1 blink code.

I think the fault may well be lead free solder on one of those large BGAs. The same cause as Xbox 360 "red ring of death" / PS3 "yellow light of death" and also a problem in some Panasonic gear. Shockingly common in all electronics, in fact.

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

Yeah, you right, hope i won't damage anything this time. So if the chip seem to cause memory bugs, again, if i understood correctly, i can swap 50VT20 D board in the 54VT25 and back in the 50VT20 WITHOUT any hardware issue right ?

If this is the case that's what i'm gonna do in the next hour, need a coffee.

So sometimes the chip would load the memory correctly and sometimes not, so chip is like a bad PC memory failling apart, or a USB memory ending is process.

God Damn it's -30 Degres Celcius outhere, we're frozing.

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

The data is on the D board, so swapping the D board shouldn't cause any one board to be reprogrammed to fit the other A board.

The thinking seems to be 1 blink might be related to memory if it were permanent, but intermittent issues like yours are more likely related to the actual hardware.

Knowledge comes from experience, and not being afraid to break things.... I remember when tw2005 was fixing SC boards he blew up quite a few parts before getting it just right... I did the same with my first few PSU repairs. It's all good fun, but you have to persevere.

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

God damn, finally fell asleep on the cough after a couples of hours straight looking for problems.

Can you tell me how you guys know all these stuffs about electronic, god i'm fascinated by people's knowledge and rspect for those experienced tech like y'all, we need more of them.


Back to the topic, so if i understand correctly, i can swap these 2 D-board in and out between 54VT25 and 50VT20 without any problem or damage. I'm not quit sure i've understand the memory thing explain by tw2005. Is a new memory will be loaded in D board 50VT20 once i've installed it in the 54VT25, that can cause de SOS1. If so, will it be corrupt or something and when I put it back in the 50VT20 will everything will be ok ?

Hope you understand this one clearly with my second language english, i'm french by the way.

Again thanks guys, still don't know where the hell you get all this stuff about electronic, respect guys, really enjoy those conversation, may god hel me find the problem on this beautiful 54VT25.

[tw2005]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Don't see any of this under the D-Board on the VT25.

When i'm finished with this/that TV, I may wanna put it in the garbage afterall. Can't seem to find the problem god damn it. But if the TV still works, the problem must be somewhere.

What I see is exactly what I expected, 2 chips that store data.

One is even marked with the firmware version loaded. TVRR491.

That's the panel data and will be different.

If you opened the service manual and find, ic9304 & ic9001 you could get from the parts list the part number which is the firmware loaded to each.

Then you could download the service manual for free from tosee if both are different.

you should then find that in the 50VT20

IC9001 TVRR477S
IC9304 TVRR490S

In the 54VT25

IC9001 TVRR478S

IC9304 TVRR491S ( you can see 491 stamped on the chip in the photo)

Swapping both those will change the D-board to suit each model.

If the fault is caused by one of those memory chips it will transfer across to the new board.

This i proved when i did my A board conversion and discovered a bad IC9304 was producing SOS1 in my instance.

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

IC304 looks like SPI flash - probably has the panel S/W on it. Doesn't look too hard to transport from one board to another. IC001 is an eeprom probably for panel hour count among others, used to adjust drive patterns as panel ages.

[Frank3y3]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Don't see any of this under the D-Board on the VT25.

When i'm finished with this/that TV, I may wanna put it in the garbage afterall. Can't seem to find the problem god damn it. But if the TV still works, the problem must be somewhere.

[tw2005]

Re: Panasonic TC-P54VT25 _1 Blinking Code

That being said I cannot see any EEPROM on that D board. Could be that it gets configuration from the A board? Or perhaps it's baked into that Panasonic microcontroller on the right.

There's 2 sides to every coin. IC9304 is on the underside

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

If that were dead, the panel would have a line/bar on it in that position or would never turn on. I have never heard of intermittent panel.

[Frank3y3]

Panasonic TC-P54VT25 _1 Blinking Code

Here is what the guy at the repair shop show me, and told me the panel was short and the chip on the ribbon cable was dead. In order to replace the ribbon cable to change the chip eh needed to replace the panel itself because the ribbon cable is between the rear metallic and the screen ?

Here's the pics. Just under the screwdriver and a close up at the ribbon cable, the chip is out of focus a little bit. Am I seeing the right thing, is the little grey/black rectangle in the middle the chip ?

What you think ?

God Damn, you guys posts reply while i'm writing stuff, i'm all excited, can wait to solve the problem or to put it the garbage.

Multimiter, in which picture, i've named them all, can you tell me in which one ?

Ok, i will test the D board I guess.

[tom66]

Re: Panasonic TC-P54VT25 _1 Blinking Code

That being said I cannot see any EEPROM on that D board. Could be that it gets configuration from the A board? Or perhaps it's baked into that Panasonic microcontroller on the right.

[tw2005]

Re: Panasonic TC-P54VT25 _1 Blinking Code

Numbers on the chips and the boards are the same. Can it be programmed differently in this case or it's really the same for the 50 and the 54 ?

How can I post a Video ? Do I post a link for youtube ?

I tried to explain that earlier. The difference will be the data loaded onto the EEPROMs or settings depending on the size of the TV. If you're purely comparing the boards visually they will appear identical. Sometimes they put a label on the EEPROMS identifying the firmware loaded but not normally.

I've experimented with this on the A board for the TV I had SOS 1. I got a board from new Zealand 50" for 42" Australian model. Same Board series, different revision. I swapped the eeproms from mine to the new board it then became a 42" Australian board.

Visually identical chip for chip.