Apex Digital GB4308 43" Rear Projection EDTV-Ready Television Logo

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

10 Answers

Blue screen with random horizontal lines

Hello! I'm taking a quick look at my grandpa's television and apparently a blue screen with random lines is the only thing showing. I cannot bring up the menu or anything (volume, etc...). I was wondering if anyone might have encountered this before. I contacted Apex just in case this might be a common occurence with this model and they just give me the standard 'reset the unit and if it doesn't work, take it to a shop'. I opened up the unit (and took precautions not to kill myself) and checked the electrical components (faulty caps, etc..) everything 'seems' alright but I'm not sure. Any feedback will be greatly appreciated! Craig

Posted by Craig Mcninch on

  • 2 more comments 
  • Craig Mcninch Apr 24, 2006

    uh oh!

    thanks!

    Craig

  • Craig Mcninch Jul 20, 2006

    Well, replaced a 16V 3300 uf capacitor that was bulging and all the fueses looked okay, but still no luck. Any recommendations?

  • Craig Mcninch Jul 20, 2006

    found this but I don't have access to this service...
    http://www.euras.com/repair_tips_1/Apex/...

    Thanks!

  • Anonymous Sep 23, 2008

    Blue screen with random horizontal lines problem

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10 Answers

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OK to help assist everyone having the BLUE HUE and CURVED LINES Issue on their Rear Projection HDTV no matter their model. Here are the steps to take. The first thing to check is the FOCUS BLOCK or G2 Focus Transformer or CRX F-Pack. I have replaced mine, however it didn't resolve the issue. I am onto the next item the CRT Board for Blue (Which is the board under one of the three color lamps inside your tv) Please see photo below (if photo is not large enough below go to link to review notes as well) If the CRT Board is not it, then the next step will be the Signal Board which is a larger board in the back. In a week I will have a picture of both.

INSTRUCTIONS:

  1. Remove the outside cover
  2. Remove the wood plank/panel
  3. In the front is the G2 Focus Block/Transformer, while set is on turn the top 3 knobs till the screen goes black/dark grey.
  4. adjusting the colors till you receive the desired or normal color/picture.
  5. Once you have received the proper color/picture tap the side of the Focus Block.
  6. IF The colors go out of wack again and the blue comes back strong then this "CAN BE" the Focus Block.
  7. NOTE: IF the color stays stable, then you problem is resolved and you do not need to replace it.

Replace the G2 Focus Block aka Focus Transformer, if Hitachi it's called a CRX F-Pack. This item will cost about $50. Not expensive. You will likely need a soldiering iron. DO TURN OFF & UNPLUG THE TV WHEN INSERTING ANY METAL OBJECTS INTO THE TV!!

FOLLOW THE PHOTOS/DIAGRAM in link below for assistance in the above instructions. I will post my next process since it was not my Focus Block that was an issue.

ONE SOLID PHOTO Go to URL CLICK HERE, click on that image to enlarge. Hope this helps you all out!

Posted on Apr 15, 2008

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Anonymous

My tv is doing the same thing and i think i need a blue tube but i want to know how much its going to cost me

Posted on Mar 01, 2008

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Anonymous

The set I just fixed had poor connections on a disc shaped part near the top.

Posted on Oct 02, 2007

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Hey, I'm working on the same model right now. I talked to a tech at PTS, and he had me send in the 'Main Board' (left side board from the rear of tv with tuner & AV in/out jack board attached) and send in the smaller boards attached to it as well. Cost was $48.95 + s/h. Got the board back, had same problem, but there were components replaced. Next, I replaced the 3300uf cap (C863) on main board you referred to, which is the power supply source for part of that board just repaired. ALSO, there is a diode that could be shorted (VD866) and a small fusible resistor that can open in that circuit (RF851). I replaced these, got my picture & sound back, but the set turns itself off & on every 7 seconds. Still troubleshooting this problem now, and any help would be greatly appreciated. Hope this helps you! Toddtech

Posted on Jul 17, 2007

Anonymous

INPUT NOT WORKING

Posted on Jun 07, 2007

Anonymous

May also be a shorted blue crt (picture tube)

Posted on May 02, 2007

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Not really a solution but I have purchased a broken T.V. in hopes of getting it fixed. This is the only place on the internet where I can find anything about htis. 1. when you plug the set up it comes on automatically. 2. No volume control from the set (havent tried remote) 3. No menu 4. When set come s on there are criss cross like lines (blue) all over the screen. I have pulle out the power supply board and I see the swollen 3300 uF cap but it doesent seem to be bad. I have found that you can order the Power supply COMPLETE from www.bestbuy.com for 69$. It seems really worth it to me if thats what will fix it other than that I am not sure what to do.. I see that the review about the 3300 uF was voted for but im nots ure where teh pico fuse is and was just thinking on getting the whole power supply board just to be safe.. thoughts? and did you get this T.V. working once again?

Posted on Aug 22, 2006

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Replace 3300 uf 35 volt? capacitor on power supply as well as pico fuse associated with that supply voltage

Posted on May 04, 2006

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Sorry for the bad news but it sounds like a shorted picture tube!!!

Posted on Apr 23, 2006

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From the description of your problem it sounds like you are describing a bright blue screen with retrace lines. If that is not the case let me know as the answer will be different. If this sounds like what you have, first I would look into the red and green tubes to see if they are on (lighting up). Also look at the heaters on all three for a red glow. If all heaters are on but no output from the red or green, pick either color, note the position of the screen drive control, and then turn it up until you reach max or have output. If you get nothing return the screen drive to the original setting. If you have an o-scope and know how to use it check the input and output signal of the driver for the blue crt. If the signal is correct in and off scale out check all resistors on the crt board. One is probably open. If the signal is off scale in to the driver back up to the video IC on the mainboard and look at the signal. If it is bad you probably have a bad IC. To resolve this problem you will need a service manual. Go to this address http://www.servicemanual.net where you can download it for $16.00 US. You're going to need it to solve this. Good luck and keep safety in mind.

Posted on Jul 20, 2006

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