Panasonic TH-42PX25 480 issue

[n3lka]

Hello, I picked up a cheap TH-42PX25. The picture looks fine with a 720 or better signal. I checked this on an antenna input.

It looks to be the same on the composite as well, although I couldn't check the 480 against the 720 signal on the composite because my cable box here in the shop isn't HD.

If there is a name for this problem, what is it, so I can add it to my knowledge base, as well as anyone else who hasn't seen it before.

Thanks,
Brian

[n3lka]

Re: Panasonic TH-42PX25 480 issue

Ok, so I got into the service mode and I see that it's set for 1080i, and all other options are grayed out. I di have the service manual, but so far nothing how to get into that mode, and does this mean that this set can only do either 1080, 720, or 480 and not auto switch? seems weird.

[n3lka]

Re: Panasonic TH-42PX25 480 issue

Ok, found a thread in the AVS forums. http://www.avsforum.com/t/534816/hel...3rd-off-screen.

A guy had the same issue I did. He had panasonic service come out and upgrade software. So being the post is 9 years old, does anyone know where to get firmware updates for the panasonics, and how to do them?

[n3lka]

Re: Panasonic TH-42PX25 480 issue

Ok, so some more digging. I found the files and instructions needed.



If you browse the ftp site, you will find what you need.

I tried to do the upgrade, but the tv is telling me the card is not supported. I believe it's because the card I'm using is a 2gb card, and the panny cannot probably support it. So I just ordered a 128mb sd card on ebay. I have to wait for that to show.

So the tv will sit up against the wall until the card shows up.

[n3lka]

Re: Panasonic TH-42PX25 480 issue

Ok, so the sd card didn't work, at all. I did find a thread in the avs forums about using a programming jig to reprogram the tv. Does anyone out here have one that I could rent or borrow?

[n3lka]

Re: Panasonic TH-42PX25 480 issue

Anyone have this jig in this service bulletin?

[tw2005]

Re: Panasonic TH-42PX25 480 issue

EDIT: I thought I had this figured but not 100% sure. Also i'm reading that TNPEEPJIGS and TXNPX25JIGS are subs but probably also no longer available.


The JIG goes to PA23 which goes to DG8 via PA8. I'm looking at


STB5V
SRQ
GND
SCL1
SDA1
SCL2
SDA2

That what we need to trace from DG8 and see which EEPROM it may be flashing. Needs fresh eyes on it , see if you or anyone else can nut it out.
where I may fall down on this is SDA2 which looks like it goes to M38047M6-C15FP CONVERT MICOM which may also be programmable and what is being flashed in which case this idea goes out the window.

This could be something TOM66 may be able to figure.

It does say corrupted EEPROM data so If I was having a half guess, IC002 is the one I expect is being reloaded but IC002 is listed $9-12,
IC002, C3EBJC000037

are fitted to 37 - 50 inch PDP. there are some LCD and CRT models showing too.


IF (BIG IF) still able to be purchased, replacing SOIC 8pin is real easy and should give you the same result as re-writing the EEPROM.

SEARS shows IC002 as NLA but Encompass and partsstore say special order?

maybe consider that path if the DG is expensive/difficult to get and you're confident that reflash is all you need.

[n3lka]

Re: Panasonic TH-42PX25 480 issue

There was a long thread in avsforums about the issue and borrowing a jig from one of the posters out there. However, he hasn't been on since August. The jig looks easy enough to make, but the eeprom with the new software on it would be needed as well.

I did hear in one thread that you could download the file px25.exe, which I've found, and flash it. I do have an sd card that I ordered, but the front sd card reader is still having issues reading that card as well.

I was going to try the sd card in the rear service slot and try following the instructions in the service bulletin, just to see if it would work.

there are a couple of DG boards for about $45, I asked the vendors if they were pulled from systems that are after the serial # mentioned in the bulletin, or if the systems were updated. I'm hoping that the problem is over 8 years old and a lot of these cards were updated.

Picked this set for $25, great picture on 720, I mean great, no sparkles, anything. For a ten year old plasma, that's pretty good. I may be giving this set to my brother for his new house. It's realllly heavy though lol.

[tw2005]

Re: Panasonic TH-42PX25 480 issue

I guess the SD is in FAT format? If this could be done via the SD I wonder why Panasonic went to all the trouble of manufacturing a specialised jig?

Post 251 is not promising. Annoying that he mentions having trouble getting the SD to work, gets somone to fix that but no clue to how.



http://www.avsforum.com/t/534816/hel...off-screen/240

You've probably read it since your at the end of the posts.

[n3lka]

Re: Panasonic TH-42PX25 480 issue

It didn't work, would've been too easy lol. I'm going to order the new board and see what happens. If it doesn't work, I'll send it back for a restocking fee. I'm hoping that the replacement board has been flashed or is from a later serial #.