Question about JVC AV-48WP30 48" Rear Projection Television

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Convergence always needs tweaking

The convergence on my JVC AV-48WP30 always needs adjusting. After powering on and waiting 5 min or so, I will adjust it the best that I can. All 9 positions can be adjusted, mostly. The Red gun in position 9 is a bit rotated clockwise so never gets totally to white in that position. After powered on for a while I see the color separation and have to adjust it again. This happens every 30 - 60 minutes. The TV is almost 5 years old. I have electronics training but would rather not do any soldering. What might the problem be and is there anything that I can do to lessen the amount of adjustments that are needed. Thanks.

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  • John Leonard Jun 28, 2007

    Thanks Mike for the solution. I may try to do the replacement. Could you send whatever info I might need to complete the replacement? Which IC and the acutal proceedure? Thanks again.

    John

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This sounds to me as if you have a defective convergence output IC, whose gain is now sensitive to heat. As the IC gets warm, the gain changes and you see the colors separate. If you do not want to do any soldering then have the IC replaced by someone with experience in convergence circuits.

Posted on Jun 28, 2007

  • Mike Longo
    Mike Longo Jun 29, 2007

    Remove the back of the set and look for 2 large black IC's on a large heat sink. The IC's are probably STK392-110, and if you are going to replace one then you might as well go ahead and replace both, but use the improved STK392-150 IC's. With the set unplugged, unsolder the IC's, unscrew them and remove them and clean off the old heat sink compound from the heat sink. Apply fresh heat sink compound to the new IC's, screw them in place and solder the pins. You should then do the convergence alignment and your picture should be fine.

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1 Answer

I CANT ADJUST THE RED VERTICAL LINES ON MY JVC REAR PROJECTION TV. i HAVE DONE CONVERGENCE AND MANUALLY ADJUSTED THE RED LINES HORIZONTALLY, BUT NO LUCK WHAT CONTROLS TO USE VERTICALLY


If it will not adjust up or down or left and right the convergence chips need to be replaced.

See attached photos of board that is in your set:


10_16_2011_2_52_30_am.jpg10_16_2011_2_52_47_am.jpg


This can be a do it yourself repair and the parts do not cost a fortune.

Can I help?

SD TECH

Oct 16, 2011 | JVC AV-48WP30 48" Rear Projection...

1 Answer

HAD MY CONVERGENCE ADJUSTED BY REPLACING SOME PARTS. I NEED JUST ONE OF THE CROSSES ADJUSTED IN THE RIGHT UPPER CORNER OF THE NINE CROSSES


Ur tv still have convergence problems,if u can't reajust manually crosses or auto convergence.U must have 2 not just 1 STK convergence ICS to be replaced,all the resistors must test by the Ohm mulitimeter to the right resistance of the resistor's and replace them as require.

Jul 01, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

The blue crosses are too far right of center to adjust


you will need to install a convergence repair kit. You can get the convergence repair kit for your model at www.tvrepairworld.com which also contains the CD with step by step instructions for the repair.

Mar 28, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Convergence problem wiht jvc av 48wp30


Bad chips...There are a ton of cheap fakes out there....Or bad resistor...

Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:
ee1ca68.jpg

You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Sep 29, 2008 | JVC AV-48WP30 48" Rear Projection...

2 Answers

Green Tube Convergence Issue


Greetings abflex,

You definately came to the right place! Here is a link right here on FixYa with the directions on how to correct this problem.

http://www.fixya.com/support/p186391-jvc_av_48wp30_48_in_rear_projection/manual-17247/page-52

I hope this helps!

Thank you,

Dorothy
Go Ahead. Use Us.

Jun 25, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

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Your convergence I.C's ( integrated circuits ) Have failed. Replace Both I.C's with Stk392-150's. The unit is equipped with 110's. These are large IC's pn the convergence board located near the front of the unit. You need soldering/desoldering experience to do this job. I would recommend seeking professional assistance.

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4 Answers

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it looks like theres a wave in the top of my screen on my jvc av-48wp30 not sure but i think it has something to do with the bulbs because the projection mirror wasfine and all wires seemed to be hooked up properly.. can you help? tell me where i can find the bulbs to replace them?

May 13, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Remote LOST - need info on what button to press...JVC AV-48WP30


There might be some features that the universal remotes aren't able to do. To perform the convergence alignment you should have the original remote.
Do you have the user manual or service manual?
The service manual will explain this process better.

Apr 10, 2008 | JVC AV-48WP30 48" Rear Projection...

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