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post #1 of 13 Old 10-04-08, 04:44 PM
fritztwo
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jvc convergence fix

I have read one of your post about fixing the convergence and I order a stk392-110 and sodered in the ne one and now the tv light comes on but no picture or sound. I checked the resistors and they were all correct but 2 of them. The 2 that were off were marked R863 (150 ohm) and R873 (220 ohm), I tooked them back out and they were the correct ohm but when I put them back in both of them dropped to 89.8 ohm, if I did one at a time they were correct until I put the other in. Can some one help me with this.
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post #2 of 13 Old 10-04-08, 04:59 PM
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Re: jvc convergence fix

1/150 + 1/220 = 1/89

The resistors are in parallel.

I suggest that you read all of the first 10 posts in the convergence thread. It explains that the -110 should be upgraded, that the resistors should be checked out of circuit, and that it is critical to purchase the parts from a reliable distributor, among much other important information.

If you want specific help, post the model number of the set and specifics about the symptom, diagnostic procedures, and other relevant information about the precise state of the set.

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post #3 of 13 Old 10-05-08, 12:26 AM
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Re: jvc convergence fix

I have a JVC av56wp74 and the the first problem was the red convergence would not line up horizontally so I replaced it with a new stk392-110 I should have upgraded to the stk394-160 but thought I should use original parts and when I put it back in tv I didn't have a picture at all. I had a friend that gave me an extra remote awhile back so I call him to see where the tv was and I went and picked it up because it was a JVC av48wp74 so I check the resistor and the readings were the same as mine but I tried that board in my tv it made a clicking noise but no picture. Then I took out some of the resistors out of the48wp74 board and did check the resistors while they were out and were correct but that was when I put them in and they dropped to 89ohm. I did read your other post and I think I put to much compound on the back of stk392-110 and don't have a good ground, could that be it.
post #4 of 13 Old 10-05-08, 09:33 AM
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Re: jvc convergence fix

The chips do not get ground from the heat sinks. The reason not to put too much heat sink compound is that it acts like an insulator if there is too much.

If the set worked before, it should work after you put it back together unless you missed a connection or botched the job somehow. You need to be sure that you did not miss something.

It is usually a good assumption to use original parts. Did you buy them from an authorized JVC parts distributor under the JVC part number? If not, and if you did not buy them from one of the handful of reliable distributors of Sanyo STKs, you may have received some bad parts.

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post #5 of 13 Old 10-11-08, 04:55 PM
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Re: jvc convergence fix

Thanks for your help, we got my jvc av-56wp74 going like you said if it worked when I took it apart it should work when I put it back together, so just took everything out that I changed and redid it and it started working.
My next question is I tryed the board in the jvc av-48wp74 and it would not let the blue go to the right far enough to align, but it did let me move it left or right and up and down, and the red worked right. Can you help
post #6 of 13 Old 10-11-08, 05:11 PM
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Re: jvc convergence fix

Probably a bad output IC and/or open resistor. Read the convergence thread carefully, particularly the first 10 posts.

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post #7 of 13 Old 02-22-11, 03:14 PM
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Re: jvc convergence fix

I am having the same problem, but someone threw my notes away or lost them. can someone tell me the resistor chart. and the two capacitor uf ratings. there are two capacitors that the label has melted. they just metal. no info on them. i am guessing that maybe a 35 volt 220 uf will be ok. but i dont want to take a chance with my new 392-120 ic's
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post #8 of 13 Old 10-04-12, 12:50 PM
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Re: jvc convergence fix

I know this thread is a little old but I have replace the 110's with 150's and I have also read the how to on it as well. checked the resistors and the first one 1.5 ohm 1 watt metal film resistor was out. so I went to my local tv repair shop and picked one up.

the screen turns on and everything works and now all i have to do is set the convergence rightttt?

Unfortunatly whn I go the the convergence menu I cannot go any further and it will not let me go into the auto or manual convergence. There is also a reset button which when I press it the screen goes black but only the green projector light is on.
p.s. have org remote.

any ideas??

thanks
stefan
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post #9 of 13 Old 10-04-12, 07:47 PM
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Re: jvc convergence fix

I am not really clear on what the problem is. When you say you go to the convergence menu and cannot go any further, what does this mean? Is the green only lit at this point? Do you have the service manual?

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post #10 of 13 Old 10-04-12, 11:01 PM
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Re: jvc convergence fix

that is exactly the problem. when I try to select manual or auto convergence it does NOT go any further. it just sits there for about 10 seconds and then i am able to try and select up and down again. is there some type of secret "secret" to get to the menu. I tried the buttons "ok" and I also tried the vol+ to select it and neither take me anywhere. I am hoping its something stupid.

thanks,
Stefan
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