Question about Apex Digital GB51HD09 51" Rear Projection Television

3 Answers

Picture out of convergence

I have a Apex GB51HD09 2002 and it is having a picture problem looks good in the center but outside edge looks like a fish bowl I have tried convergence but it did not work also I haved changed out the IC's and still the same problem can anyone give me more ideas to look for thanks.

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  • s10car Mar 18, 2008

    What other thing do you think I should change because I took out the board and check all the resistors they ohm out ok but when I go to adjust convergence the cross hair do not move at all and it gets to a point that the word max comes out that means it think it is moving but it is not I can not swap colors like adjust the red but no blue I know the green is set you can not mess with it. Thanks for the reply please let me know what I should look for thanks.

  • s10car Mar 18, 2008

    Troylove here are some pics of the screen I got maybe this can help you find out for me what is wrong with it help me fix it thanks

  • s10car Mar 19, 2008

    Troylove11 I have replaced the IC's with the following number that I got from Alfa eletronics here in area STK 392-020 is the one it had and they told me STK 392-040 is the replacement for that crossover and still have the same problem now I have check all resistors that go to that IC's they check out ok in value but they thanks again for the fast reply



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I had a similar problem, that was solved by re-soldering the ICs on the main board at the base of the TV. There are two ICs that are attached to two large heat sinks and one had a open connection to the main board. If you gently tap on each heat sink while observing the picture you will find the open circuit.

Posted on Nov 17, 2008


I just wanted to let everyone know that I went ahead and called Focsa TV repair and he came out and helped me fix it so it was a bad cap and a inline fuse on the power supply he fix in less then ten mintues thanks again for the help.

Posted on Mar 21, 2008

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There are other things that has to be changed

Posted on Mar 18, 2008

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  • Lashawn Robinson Mar 18, 2008

    Now are you able to do a multiconvergence instead of the center alignments? Meaning do you have the screen which shows many crosses that you can go to the corners and sides? This control should be below the Red and Blue adjustments. It could be called Red Multiconverg and same for Blue Multi.

  • Lashawn Robinson Mar 19, 2008

    Ok, now my question is what happens when you are in then 1,3,7,9 area? Does it converge in these area? It do not have to be in a straight line from one side to the other only all colors have to lign up in there area. Is this happening?

  • Lashawn Robinson Mar 19, 2008

    If every point lines up with no problem then you have to remember to save before leaving. Also it looks from the pic that there is a bow in the top bottom and sides. This can be cause by low ohm resistor not being replaced. Did you use the same IC' or did you go up in value?


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1 Answer

There is a bow in the picture top and bottom of screen

The tv have a problems known as a convergence problems,it is dead.Tv have colors R,G,B lines mis alignments,have shadows pictures or 3D picture look alike?Yes the tv convergence board have dead 2 STK convergence ICS and some or all of it resistors too.These parts,must be replace on the tv convergence board to solved the tv convergence picture problems.The shop will cost u like $300-350 for parts and labors.

Jun 09, 2011 | Apex Digital GB4308 43" Rear Projection...

1 Answer

The picture projects the image with concave lines on the edges. I'll explain further: somehow the picture is distorted in a way that bends the four edges of the picture in a curved-concave manner so that...

Projection sets have two very common problems.

The first common problem is convergence

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. This is called convergence.

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,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

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

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya

Nov 26, 2009 | Mitsubishi VS-55705 55" Rear Projection...

1 Answer

Turned TV on and screen has a concave look to it.

change the convergence chips or lack of voltage in the chips get advice from tech never your home

May 04, 2009 | Mitsubishi VS-50705 50" Rear Projection...

1 Answer

Apex GB4308 43" tv have to set convergence each time I turn it on

Replace your STK ICs and look for Bad capacitor by vertical IC 100uf 35v.

Jan 14, 2009 | Apex Digital GB4308 43" Rear Projection...

1 Answer


Pin-Cushion distortion. Its PIN amp section circuit should be checked. Contact any experienced service technician. This is not a user repairable fault.
Please visit these sites to get some details./

Mar 02, 2018 | Mitsubishi VS-6043 60" Rear Projection...

1 Answer

Can't adjust convergence and fishbowl effect to picture

Chances are the 4.7 ohm 1/2 watt resistors are open and the s.5 amp picos in line with the resistors may be open as well.

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1 Answer

Picture Problem!! and its not convergence (Double vision except for middle of screen)

Could be pin correction circuit or your picture tubes could be worn out . Sometimes when the crt's get weak the edges seem not as clear as the center of the screen . Give model number if you think the pin correction may be your problem but, the tv is pretty old and avg. life for them is 12 to 15 years when the picture tubes start to degrade . Good luck

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Yellowing screen off-center - not a convergence issue

You might want to try the optic lens adjustment screw on the side of each crt. Mark them before moving.

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7 Answers

My projection tv picture is messed up

I'm not to sure what exactly is wrong with your tv, but I do know that it is NOT the convergence board. I have the same problem with the same model and was told to replace the board. I waisted $85 bucks. The only other thing that I can figure is it must be the STK's inside the TV. If you fix yours please repost and let me know so i can fix mine.

Mar 09, 2007 | Apex Digital GB4308 43" Rear Projection...

1 Answer

Convergence and picture problems

This TV probably uses two convergence IC Packs that will need to be replaced and be re-converged. There may also be a resistor or two that may need replacing as well. The projection tubes should last another 3 years or so.

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