Question about Apex Digital GB4308 43" Rear Projection EDTV-Ready Television

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Convergence IC's replaced, still won't converge

Okay, so I had the normal problem where my convergence was off and I couldn't adjust all of the lines but I could save what I had done. So I replaced the IC's. However this hasn't fixed my problem. I still can't move the lifes sideways when in red but can move the up and down lines. What in the world is going on? Is it possible to have another bad IC even though it was brand new? And is there a way to tell which one on the board is controlling the red lines? Could it be something other than the IC's?

your help is appreciated.

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  • Frank Gant
    Frank Gant Mar 02, 2008

    I have now tested the resistors and found one to be out of range. Should be 2.2 ohms and it's reading .796. So well out of range for it. Bet that's my problem. Now I just need to find these darn resistors.

  • Frank Gant
    Frank Gant Mar 29, 2008

    Okay, I had it all working. Moved it into the house from the garage where I was working on it and now I can no longer adjust the convergence at all. What the heck is going on. lol

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I had a similar problem. Purchased a rptv second hand. Got it home convergence was off (was OK prior to moving it). Turns out it was a dry solder joint. Check underneath the conv pcb.

Posted on Apr 29, 2008

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3 Answers

Colored lines at top and bottom when tv comes on and seeing double vision in different colors at all times


If your tv is not a DLP the problem is in the convergence, try to adjust it using your original remote control go to the setting menu then to the convergence section. Adjust the red and blue convergence. you should move the red and the blue in up, down and left, right if this color does not move far enough your convergence IC is already defective. Replacing this convergence IC will solve the problem. In locating this convergence IC you should remove the back cover of your unit but be sure to unplug it before doing this. This convergence IC is attached to a large aluminum plate, it is the heat sink, and it has a marking of stk- ### followed by numbers. You can try to pull it out using a soldering iron and soldering pump but be careful you may damage the board and cause much problem to your unit. Or you can contact a technician to do it for you and save you from stress good day and best regards.

Aug 28, 2011 | RCA Projection Televisions

1 Answer

JVC AV-48WP30 convergence drifting after IC replacement


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony,Samsung, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith, and others. You can get a convergenece repair kit wiith instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms
  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted or warped
  • No Audio/Video - makes a chirping sound.
Problem #2

Another common problem is dull or washed out video.
Your TV may have one or more of the following symptoms....
  • Dull looking picture
  • White looking picture
  • Halos around objects
  • Red/Orange looking picture

You can see some more examples and find a fix here
bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Mar 16, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

My set is 10 yrs old. In the upper left and lower


Try adjusting the convergence. If it won't move see below- red IC in particular
This sounds like convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$400 Be sure to vote/rate me if this helped Thanks!
See link for more detail
http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html

Oct 18, 2009 | Sony KP-43HT20 43" Rear Projection...

1 Answer

Convergance problem


Hi, I`m assuming your going into the menu and trying to adjust convergence and the lines won`t align? If so the convergence IC`s have failed and that circuit will need to be checked to see which parts have failed and then replace them, probably time to call in a tv tech for that one, video-tek

Jun 09, 2009 | Samsung HCN436W 43" Rear Projection...

1 Answer

The Screen looks 3D & Colors don't line up on my big screen????


If the convergence is off more than 1/2 inch or so you can't adjust. you have a failure of hardware. most likely the output IC. This set has 2 outputs for convergence. Each output contains 3 circuits, Six circuits altogether 2 red ,2 blue and 2 green. The normal customer adjustment will only alow adjustment of blue and red. They should be converged onto the green. There is a much more complex adjustment in the service mode for Geometry and convergence. These adjustments are only needed when you replace a failed componnent like the output ic. These ICs have been upgraded several times since the production of this set. The latest and most powerfull version is STK394-160. If feel up to it I suggest changing both outputs and the corresponding output resistors. Then do a complete geometry and convergence alignment.

Apr 16, 2009 | Hitachi 50UX57B 50" Rear Projection...

1 Answer

Problem with Samsung TV


SAMSUNG Convergence Problem


It looks like blue convergence. Look at menu, select convergence and see if blue top is bent down on convergence adjust screen. Probably won’t adjust.

Some Samsungs have convergence IC’s on a separate convergence board in the back of the TV. Others have the IC’s mounted on the main deflection board. Either way the board has to be removed to get at the dud IC’s and associated burnt resistors.

You remove the appropriate board, determine if any resistors are burnt or damaged, replace any burnt or out of tolerance resistors, replace 1 or 2 IC's and re-install the board.

Now you have to adjust it to look like new.

If the unit has not been misadjusted and everything is OK now, running the auto focus may put the picture back to it’s previous stunning quality, as it was before IC failed.

If after self or autofocus it is still misadjusted noticeably, try the customer convergence adjustments. Operators’ manuals are available on web through searching.

If convergence can not be adjusted properly, you messed up chip install or resistors may be wrong value or open; or it needs major adjustment.

If you live around Calgary, Alberta try me instead:

http://calgaryconvergencerepair.weebly.com/convergence-explanation.html


Or try to the find the repairperson part of this website (on the Homepage) and search postal code. Maybe you will be lucky and someone from your area is listed for Projection TV repair.

Most rookies doing this job will cause damage and not be successful. They will pay double for someone to fix their mess or end up scrapping the TV. It is not a simple task. It is more difficult than batteries on a remote.

Good Luck

easyab

Jun 06, 2008 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Toshiba 65H81 convergence issue


Does the blue and red crosses move at all ... eather vertically or horizontally. if they move at all then it may not be the chips.. could be a resistor. if the crosses dont move then it probally the ic. these chips run about 7 to 45 dollars apeace depending on type. at our shop we charge around 125 to put in.

Jan 15, 2008 | Toshiba 65H81 65" Rear Projection...

2 Answers

Sony HDTV Convergence Issue


No, You will not solve the problem with only changing the convergence IC, associated resisters may also be required.
Beside of that, after spending time to get parts and replace the ICs, you need to make and adjustment the color lines (about 14 lines)
This adjustment without experience will take you about 3 to 4 times and 4 hours each to get thing right (if you areskillfull, most of people failed this adjustment).. The total time spend for this problem would take you full 24 working hours.
I successfully adjusted one set of my big TV (95%, need more more round)), on another set one I failed.

Nov 30, 2007 | Projection Televisions

2 Answers

Convergence


Do not adjust any knobs as instucted in the previous thread if you TV have a convergence problem. Doing so will only make things worse. The blog does however show you how to fix other common problems with these sets.

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.

Nov 26, 2007 | Hitachi 60UX57B 60" Rear Projection...

3 Answers

Samsung 52" rear Projection TV Convergence Problem


Replace both STK392-040 convergence IC's with OEM or better
quality = I use Panasonic with great success. They are soldered
in and requires at least PCB removal or perhaps entire chassis.
Please post response if you need more help...................T

Sep 03, 2007 | Projection Televisions

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