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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
GE 46GW945 Rear Projection TV problems! Convergence?

 

 


bbcardwiz
New User

Oct 6, 2005, 9:13 PM

Post #1 of 10 (5525 views)
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GE 46GW945 Rear Projection TV problems! Convergence? Can't Post

Hi all, I've found a lot of great info on this site in regards to fixing projection TVs and I need some help with mine if anyone has a minute.

1) I've learned that often times the STK "chip" (IC right?) goes bad on a board and needs replaced and swapping that can oftentimes fix a lot of convergence issues. On my TV, that chip specifically is the STK730-130. I've already ordered one from an online supplier for about $5.00. I plan on swapping it out myself once I get it, so I'm hoping that is the answer to my problems.

2) Let's describe the problem. I've got some serious color "shifting" going on. I can see very intense colored "shadows" behind certain objects of red and blue colors. This led me to believe it was a convergence issue. I went into the service menu and adjusted EVERYTHING to no avail. I made the picture better, but the image still pretty much stinks. Also, the familiar and seemingly typical "pincushion" effect mentioned by others when they have convergence problems is on my screen and even adjusting the geometry parameters in the service menu does nothing to help this....

3) So, I'm going to swap out the STK chip as mentioned in item #1 and I will cross my fingers that that will do the trick.

4) Here's my other problem. Let's say the STK chip doesn't fix it...then I've heard to replace the whole digital convergence board itself. I can order the whole convergence board online somewhere I'm sure... I think it's around $115. Is that an option I should consider going forward? However, on this model TV, the STK chip is not located on the convergence board, it's on a smaller board ABOVE the convergence board. The schematic calls this board the power conversion board I think....Anyway, my schematic does not list ANY part number for this board (or any other boards for that matter). I want to potentially buy an entire new "power conversion" board if my STK swap does not fix the unit b4 buying the convergence board. However, to do so, I need the part number and I don't have that because my schematic doesn't say so. Is this part # for this board something that would be listed in the service manual? Can someone tell me the part number or better yet another NAME for this board that the parts suppliers would be calling it? Is the board I want synonymous with the "Integrated Circuit Board" name I've been seeing on some parts sites like tritronics for my model TV? In other words, I specifically know what part I think I need to replace, my problem is I just don't have a part number.

5) I've tried calling GE...no help. They forwarded me to Thomson who handles all their TV parts, and they said they can't help me either as all their parts are distributed via other parties like Global Inc. Global inc was no help either....

So maybe someone can help me here with some advice or some part numbers?

Thanks!



probuilt
User

Oct 6, 2005, 9:58 PM

Post #2 of 10 (5512 views)
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Re: [bbcardwiz] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

Sounds pretty typical to me. I'm currently at the same juncture as you right now, I'm waiting for my stk's to arrive in the mail. I've noticed on my Mitsubishi, that there is a part number right on the board it self. Maybe yours is etched in (soldered or in green pcb). Also mine has stickers on the inside panels labeling each board alphabetically (A board, B board etc) and the layout of them. There are also stickers showing where the fuses are on each board, that might be one other thing you might want to check.

I like posting pictures with my posts to better let people help me, i suggest the same for you if you can. Also, you might have better luck with responses if you posted this in the correct forum. (projection tv forum). You might be able to have a moderator move it for you.



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Just ask "Mel" he did it too. Learn from the Pro's


bbcardwiz
New User

Oct 7, 2005, 7:26 PM

Post #3 of 10 (5501 views)
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Re: [probuilt] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

thanks probuilt.

I just got my chip in the mail today, I'll be soldering it on the board shortly. I'll let you know how I make out. Hopefully your problem is fixed by replacing the STK chips as well.

As for moving the topic to the projection TV forum, I was under the impression that this forum was fine as it is titled TV Repair Forum.

I thought the projection TV forum was for simply discussing projection TVs not projection TV repair, if you catch my drift.

If a moderator is reading this and wants to move my topic to that forum, I really don't mind.

If my STK chip is replaced and I'm having the same issue, then I'm not sure what to do at that point. I could try replacing entire boards. I am armed with a voltmeter. Maybe I should try checking the voltage across certain fuses/resistors, to try and pinpoint the exact board/place where the problems are happening.

By the way, what is the pincushion circuit that certain people in TV land are referencing? Is this synonymous with the same board that the STK chip is on?

And I still wish I knew what the part number/name is for board that has my STK on it....probuilt, I do have a number etched on the board itself, but that number doesn't match any number i've seen on the parts suppliers websites unfortunately. Also, though the board does have a barcode on it and some other numbers. Those numbers don't match any part #s on suppliers websites either, but maybe those two numbers will lead me in the right direction. I think I'm screwed because most of the parts suppliers list RCA part numbers, but my TV is a GE with different numbers. I need some sort of cross reference between the RCA numbers and the GE numbers I think.

If anyone can shed anymore light on this one, that would be great.

Thanks!


mikemaiertv
Enthusiast


Oct 7, 2005, 11:08 PM

Post #4 of 10 (5494 views)
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Re: [bbcardwiz] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

Well the little board with the stk730 on it is the power supply for the convergance, it's part # 242675 supersede by 250686
Mike Owens Owner Competition TV Spokane WA.


bbcardwiz
New User

Oct 7, 2005, 11:28 PM

Post #5 of 10 (5492 views)
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Re: [mikemaiertv] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

thanks for the info mike.

i just replaced the STK730-130 on the little power board for the convergence and no luck...same issues...pincushion screen...heavy on the green...when i up the red and blue...looks horrible....

now what? start troubleshooting the convergence board itself? how do i go about that?

or should i just drop $115 and get a whole new convergence board?

Thanks!


criffle
New User

Mar 25, 2007, 5:29 AM

Post #6 of 10 (4770 views)
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Re: [bbcardwiz] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

Any Luck? I just inherited the same tv with the same convergence issue.


rrobor
Veteran

Mar 26, 2007, 1:42 PM

Post #7 of 10 (4751 views)
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Re: [criffle] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

He would not have had luck, he reads its an STK fault finds one and changes it, He had by the sound of things flat tubes or dirty oil or perhaps convergence so why fix a working power supply. And yes to the date police, I saw when the last post was posted Im not answering that.


bbcardwiz
New User

Mar 28, 2007, 2:35 AM

Post #8 of 10 (4733 views)
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Re: [criffle] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

Hi. An update on this TV...i replaced the STK, didn't work. I replaced the convergence board, didn't work. I replaced the small power supply board...THAT didn't work. And, after that, I gave up. I ended up scrapping the TV, removing the guns and guts and circuit boards within the TV and sold all that to somebody floating around these boards actually. Your best bet is to probably do the same and move on. Save up for a newer TV and avoid all the hassles of this old TV. I even spent $75 for thomson tv service to come out to the house, just to tell me they will refuse service to my tv. what a joke those guys were! i almost felt like reporting them to the better business bureau, but in the end didn't.
anyway, good luck with your tv....
one thing i did find was that the empty tv frame does serve as a good puppet show housing for my kids!


rrobor
Veteran

Mar 28, 2007, 6:34 AM

Post #9 of 10 (4728 views)
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Re: [bbcardwiz] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

This should serve as a classic example of the troubles am amateur can get in to and the errors he can make. He reads fix reports and reads about STKs. An STK is only a power function device fitted into sort of IC case they can be power, sound , convergence and other functions Im sure Ive missed. He changes the supply yet the supply was functional so drops cash on that, Next he gets the convergence board and its not that, To me it sounded like a tube issue, probably dirty oil and the picture was a low smeared mess. Now our friend calls out the manufacturer and complains they did nothing and charged call out. Chances here are the tech that looked at it and probably condemned it because of what and how the other work was done. Where he is I dont know the law, here I leave a TV that has to be safe. I have chopped off home fitted earphone sockets and been threatened with all sorts on a live chassis unit. So learn from this tale of woe, this is a classic, the money he spent trying to save a pro job would be far more than if he had a pro fix it in the first place and its likely he would have had a TV., not a puppet show.


bbcardwiz
New User

Mar 29, 2007, 2:16 AM

Post #10 of 10 (4721 views)
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Re: [rrobor] GE 46GW945 Rear Projection TV problems! Convergence? [In reply to] Can't Post

rrobor,
I appreciate the comments you are trying to make. you are trying to save other people from my experience. kudos to you. however I have to defend myself somewhat.
1) I not only acted on advice from this thread but other tv forums as well. While I was flying in the dark so to speak, I did have advice from so called experts on this forum and others. Am I a pro? Heck no. My attempts to fix the TV were easy, non time intensive, and were targeted at common things that typically can break. Again, I agree I was pinning the tail on the donkey with a full blindfold on, I simply didn't "hit the tail" this time. Had I fixed the TV it would have been out of pure luck, and I was ok with that.
2) As for my total expenses, the TV was free, it was a giveaway, I spent about $300 in my own cash to fix it and ended up not fixing it. I sold the guns, circuit boards and everything else in the TV for $250, so I really was only out $50 - a price well worth the effort in my book, even though it turned out not working in the end.
3) As for the tech that came out and looked at the TV, he acted like a jerk. Not because he wouldn't fix my TV, but because he actually was one. He simply looked at the TV, and with a pompous and crass voice said it was old, looked at the screen/signal with the power on and said that it would be a waste of his time to fix the TV for me and then handed me an invoice for $75 all in less than 3 minutes. He said any number of issues could be wrong with it and that it would take him 4-6 hours simply to diagnose the problem and then potentially fix it - and he even said that he "couldn't be certain" that he could fix it. So, my point is taking it to the "pro's" isn't always the best advice to give. And it isn't like the company I called was Mom and Pop's We Fix-it TV service. I called a major service provider in the city I live in, Columbus, Ohio. My thinking is that the guy looked at the TV, wanted to make a quick $75 off of me because there's probably a cost risk to taking in the TV and spending lots of time, effort, parts, labor, etc on it with the possibility of not even fixing it. I just thought it was ludicrous to pay a guy $75 to look at my TV for less than 3 minutes only to say he won't work on it....when, over the phone when I scheduled the visit, they could have asked me 10-15 simple questions about the TV and at least gave me a "heads up" that the tech may not be able to do anything for me - which they didn't do.
Don't be so quick to judge a situation based upon what you've heard so far. While I didn't get the TV fixed by myself, I called the cavalry, and they came shootin blanks and basically hung me out to dry. In hindsight, Mom and Pop's We Fix It TV Service might have been my best bet. I might have gotten better service from a smaller company. Is it me or has customer service across this great land of ours, let alone the world, gone by the wayside?

 
 
 


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