Panasonic PT-47WX42 Convergence Issues

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Did you label the 2 connectors i put a square around? When i replaced the convergence chips on a 50" toshiba i forgot to label them. When i first turned on the tv it was bad blurry and you couldn't adjust it at all. I had the connectors that i put a square around in the wrong locations. It looks like the 2 connectors are about the same number of pins and within a reasonable distance they could get switched.

One has a cable... the other plug has a different pin count. In addition, everything but the 3 convergence cables had their locations sharpied onto the plugs.

I checked the 4 PITA connectors as well, at least on the main board side. I haven't checked the other side... that board looks like a PITA to remove and is a last resort.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

No luck on the config mode... I can't get it to enter the mode. I wish there was a way to get to the menu w/o fuddling with the remote...

[f67bird]

Re: Panasonic PT-47WX42 Convergence Issues

Sounds like you need to go ahead and get the original Panasonic remote control for this tv.
You know that you will fix this, and will want the correct remote control to use it with...right?

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Sounds like you need to go ahead and get the original Panasonic remote control for this tv.
You know that you will fix this, and will want the correct remote control to use it with...right?

Assuming the entire A board isn't hosed, yes.

Shame it had no remote... I did get a lot nice cables with it though (many made by Monster cable)... they came in late, AFTER I ordered fresh cables from monoprice

The remote I tried btw was a Harmony 628... however, it seems the remore layout is somewhat oddball with this tv, so even that may not have been exact enough.

Edit: Found a genuine one for $14 shipped... Hopefully it comes in next week.

[tom66]

Re: Panasonic PT-47WX42 Convergence Issues

Sell the monster cables for profit, it's not like there's any difference between them and cheap cables like from Monoprice.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Sell the monster cables for profit, it's not like there's any difference between them and cheap cables like from Monoprice.

I would but they are dirty and gooped up (from the packign tape used to bundle them).

Not sure if as used cables they have any value anyway... one is a 5ft (ish) THX component cable, the other is 10ftish Audio cable. IITC there is a monster S-video cable as well.

There also were a couple Composite cables in the bag (one was proview or some brand like that) and a S-video cable for a Playstation.

[f67bird]

Re: Panasonic PT-47WX42 Convergence Issues

Assuming the entire A board isn't hosed, yes.

From your description of the repair so far, you didn't do anything that could have hosed it... so it's not hosed.
Knowing that you can get what you are working on fixed is a big part of the
battle.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

The remote came in today.

Good news: I was able access service mode.

Bad news: changing the conversion settings there did nothing.

I rechecked my soldeing and cleaned it up. Just to be safe, I resoldered all 4 bridge connectors (on both ends, I swore the D board had cracked solder joints). Still, no change.

A side note- the conversion chips did get a little "not cold" after being on a while. Not warm, but maybe not as cold as the rest of the basement.

I'm running out of ideas... I'd love to fix it but it's looking more and more like a piece of junk good for nothing but parts. POS. Anybody have any more advice?

[ben7]

Re: Panasonic PT-47WX42 Convergence Issues

The remote came in today.

Good news: I was able access service mode.

Bad news: changing the conversion settings there did nothing.

I rechecked my soldeing and cleaned it up. Just to be safe, I resoldered all 4 bridge connectors (on both ends, I swore the D board had cracked solder joints). Still, no change.

A side note- the conversion chips did get a little "not cold" after being on a while. Not warm, but maybe not as cold as the rest of the basement.

I'm running out of ideas... I'd love to fix it but it's looking more and more like a piece of junk good for nothing but parts. POS. Anybody have any more advice?

In your FIRST post, you said that the green is off, almost like the tube is not positioned correctly. Do the other colors (red, and blue) align properly?

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

In your FIRST post, you said that the green is off, almost like the tube is not positioned correctly. Do the other colors (red, and blue) align properly?

They did then, but they don't now. Before, they were all bowed but red and blue responded to convergence inputs. Now, the image is still bowed (even moreso) and they don't respond to anything.

If I thought I could get another A-board for cheap... even just to see if that makes a difference. However, I'd imagine they go for $$$, more than the TV is probably worth (or I have in budget).

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Anybody?

All I can think of is to try to solder in the old chips... and I'm out of desoldering braid, so I can't do that.

My only other wonder is if there are internal layers to this board... the chip leads have solder tinning past where the solder pad is. the topside of the board has no traces for the chips... so maybe there are internal traces I need to get solder to?

[tom66]

Re: Panasonic PT-47WX42 Convergence Issues

It's probably a two layer board if it's just got AV components on it (low level stuff.) But, if it's got larger processors, 4 would typical, sometimes 6... but the cost of a 6 layer board of that size isn't cheap. (A rough estimate would be about £5 in high quantities.)

TV's like these are really hard to physically break (unlike LCD or plasma, which are easy victims of wii controllers or kid's toys) so spare parts will be quite rare.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

hmm.... found a fault. pin 4 of A12 is supossed to be directly connected to R7050... and the resistance is around 2k. Uh oh! The fault is is in the branch between R7001 and R7050. I'm soldering in a jumper wire between the legs to see if that does anything.

edit- no change. f***!

[ben7]

Re: Panasonic PT-47WX42 Convergence Issues

hmm.... found a fault. pin 4 of A12 is supossed to be directly connected to R7050... and the resistance is around 2k. Uh oh! The fault is is in the branch between R7001 and R7050. I'm soldering in a jumper wire between the legs to see if that does anything.

edit- no change. f***!

Did you check the resistors R7001 and R7050?

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Did you check the resistors R7001 and R7050?

yes, they were both ones I replaced.

[ben7]

Re: Panasonic PT-47WX42 Convergence Issues

yes, they were both ones I replaced.

Ah, sorry.

( short memory span )

Have you looked over the circuitboards on the necks of the crts' yet?

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Ah, sorry.

( short memory span )

Have you looked over the circuitboards on the necks of the crts' yet?

No. I didn't think they would be suspect since I haven't worked on those.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Hate to do this, but bump.

[ratdude747]

Re: Panasonic PT-47WX42 Convergence Issues

Reviving because I tried for-sure OEM sanyo chips ($40 for the pair)... no dice.

I'm out of ideas... I've tried 3 sets of replacement chips, replaced all the convergence resistors, you name it. I've tried to scope the analog bord but due to the lack of a decent scope (all I have is a 1963 Heathkit 1012, very primative), I got nowhere... so unless somebody has any ideas (the service manual has nothing other than "replace the board"), I'll try to sell/give it away for parts (the 3 CRT's are good). It's wasting space and I'm sick of looking at my epic fail...