Question about Apex Digital GB5108 51" Rear Projection EDTV-Ready Television

7 Answers

Apex GB5108 Convergence and screen issues

I came across an Apex GB5208 TV last week that someone was going to throw away. Now I hate it when something goes to the dum[ that can be fixed so I figured I'd give it a shot. The TV powers on and once it warms up the screen comes up but I can't get the colors to align properly. I've downloaded the service manuals and went through the S mode settings, but although the screen changed it didn't align any of the colors as I had hoped. Below is a link to a picture of the screen. I figured to see is to understand better. I'm a good electronics tech, but I'm new to projection screens. Any help or ideas are appreciated.

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  • Jeremy Buseman Dec 07, 2006

    That's a GB5108, typo I apologize.

  • Jeremy Buseman Jan 04, 2007

    I've read about that one and it's the convergence memory board. That would be the circuit board behind the convergence ICs that has a silver casing around it.

  • Jeremy Buseman Jan 04, 2007

    I've read about that one. It's the convergence memory board. The one behind the convergence ICs that has a silver casing around it.

  • Anonymous Jan 07, 2008

    tryinng to set convergence

  • Anonymous Mar 11, 2008

    color convergence problem

  • mikeatx Aug 01, 2008

    Same problem here, now have 2 bad convergence boards, one much worse than the other. I've reflowed the both with no luck. Any idea where to buy replacements? Is it usually just the socket mounted IC, or other problems on the board?

  • queenkha27 Apr 08, 2009

    I have apex digital GB4308 rear projection that just won't come on. Can someone help?

  • jboutlaw70 May 08, 2009

    I, like the rest of you am having an issue wih the convergence on my APEX rear projection tv. I have reset all of the convergence lines manually with no luck, then tried the factory settings option and that works until you turn the tv off and return to watch it later with screwed up lines again. Now the remote has gone out and a universal remote will not work in different functions, so I have a new remote that I have found on ebay....on its way. Anyone that can provide info would be forever thankful.



7 Answers


Posted on Oct 05, 2008


Vertical housing has to be re-alined.......see a teck.

Posted on Nov 06, 2007


I'm also seeing the same problem however in the manual it states by "pressing the P lock the cursor turns to white".  This did not happen & while you can move the colored cursor to where ever you want, you can move the color.
The only way around this might be to physically move the color crt of red & blue as green is what to tweak by.
Of course, minor movements will be obvious & it's difficult to get to the clamps on the crts.

Posted on Oct 30, 2007

On the converge screen there is a store option. Have you tried that?

Posted on Feb 13, 2007

On the converge screen there is a store option. Have you tried that?

Posted on Feb 13, 2007

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I'm having a similar problem with the same model. did u try going to the menu with 'convergence' on it? by going to that u can manually adjust the red/blue lines. my problem is after doing this, when i turn the set off/on the picture is messed up again. any ideas about that? ian

Posted on Jan 04, 2007

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I am having the exact same problem.   Have been throught the convergence, the s mode, etc, and cannot get it to line up.  Can you please post if you have figured out the solution. Thank you

Posted on Oct 24, 2007

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Related Questions:

1 Answer

Picture is going to like a 3D effect

try resoldering the convergence ICs often the pins on the ICs can develope a solder issue.

Feb 10, 2013 | Apex Digital GB5108 51" Rear Projection...

1 Answer

My apex gb5108 convergence lines wont line up.I'm watching 3d

possibly the convergance ics have failed or convergance module
soldercon or both not a very costly repair

Aug 25, 2009 | Apex Digital GB5108 51" Rear Projection...

2 Answers

Apex 51' gb5108

Just click below for convergence repair kit;

Double images and colors are blurry .Blue,red and yellow wave coming up from the bottom of the screen on the lower left and fuzzy images this is a symptom is for busted convergence IC,you must replaced this IC in order that will works better again.STK 392-xxx ICs and it's associated resistor,this resistor automatically change value,can caused truoble even though you change the ICs.If you bring this to a service center they cost you $600 to $700,but if you buy the repair kit you can save more,don't wory it is very easy because there is intallation guide including in the repair kit. Feel free to ask whatever the result... click the link for sample picture guide step by step installation;

Hope this may help;


Oct 10, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

Convergence IC's

Lines going across is a little vague but there is always the problem with the electrolytics (caps) around the vertical, be sure and get the one on the power supply too. Just change all you can find(usually 4-5). Thre are 2 convergence ic's if you didn't change them both, resolder the other one.
Then check the value on R519 for me.

Apr 09, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

51 big screen apex tv, convergence or verticle IC?

If the lines are thin and close together running horizontally, it may be the vertical driver, but that usually takes out the resistor and sometimes the diode in the B+ for the vert. Also you must replace the caps that caused the problem in the first place.

Feb 05, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

Apex gb5108

Your Convergence is off. Go through the menue to the CONVERGENCE and follow the on screen instructions.

Start with the RED gun and align each cross point starting with the upper left corner.

You will be pulling the red to match the green.

If the television shuts down during this process, it will reset the convergence and you can try again.

After you get the red gun perfectly aligned with the green, start with the blue.

follow the on screen directs and don't forget to store.

Use the remote for these adjustments.

I hope that this helps..

Jan 06, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

Apex convergence

Try resoldering the convergence chips.

Nov 08, 2007 | Apex Digital GB5108 51" Rear Projection...

3 Answers

Convergence and wavey picture problem

Actually you have 3 problems. The two that you listed and the third which is: Apex does not support their units. Ask anyone who has tried to get any service. Your problem sounds like a bad digital convergence box. I fix this problem several times a week but on name brand sets. Cost is usually less than $100 for the part. Some problems with Apex equipment can be fixed if the part is a common off the shelf part. That is not the case with your problem. Apex equipment is cheap for a reason. All posts that I have read say that they do not last long and you can't get parts. That has also been my experience as a technician. We don't even accept Apex units for repair anymore. Next time spend the extra money to buy a name brand unit and it will more than likely be repairable.

Jun 01, 2006 | Apex Digital GB5108 51" Rear Projection...

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