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

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Blue screen , horizental retrace line , no picture , audio ok

I have this problem with apex . i have only blue screen with audio but no picture, there are also retrace line on the horizental , i change all the caps on the power supply and on the main boards but no help, i suspect problem with the audio vedio sealed board, on the left side board, if any body know what is the problem please help , Thanks

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Re: Blue screen , horizental retrace line , no picture , audio ok - Apex Digital GB5108 51" Rear Projection EDTV-Ready...

Try replacing the STK- chips

Posted on Mar 20, 2008

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Blue wave across top, opened up, cleaned mirror and lenses, blew out dust in lower portion.

not a clear description... could be a blue retrace line(problem with blue picture tube) or blue convergence(defective convergence IC)

Oct 29, 2010 | Hitachi 43UWX10B 43" Rear Projection...

3 Answers

Z3 projector.3 years old. Blue tinge in one corner of projected picture. Grainy picture on dark scenes.

There may be some problem with your picture tube else try this that looks like retrace lines. Anyway, you should try to adjust screen pot not focus pot. Make sure you are turning blue screen pot (there are 3 focus pots and 3 screen pots) and do it slowly. If you turn it too much, it will affect your grayscale

Jun 23, 2008 | Projection Televisions

1 Answer

I have a KP-51HW40. Everything works fine but the screen stays blue. What could the problem be?

if blue picture tube is blooming with retrace lines? it's because it developed internal short. you might try to turn down screen on blue picture tube. always mark with fingernail polish so you can return to starting position. J.D.W.

Jun 24, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Too much yellow does not adjust with normal drop screen adjustments. can i adjust the light beams.on my philips 50"

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 1. Turn the green screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
2. Turn the red screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
3. Turn the blue screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
4. If the screen still appears too bright after proper G-2 adjustment, you need to adjust the sub-bright adjustment in the service menu
control down until screen cut-off. (Service data Range is usually 21 to 25 in the Service menu, for Sony sets you first go to category "MCP2", & then adjustment item 01( "SBRT")= subright.
For electrical the focus, put on the screen a clear picture of your choice thru an input of the TV set from a DVD, then pause the playback of the DVD Look into each color and rock that color focus control back and forth (turn the control one way then the other way slowing down as the picture goes into the best focus. till the picture looks sharp do each color till they all look in focus. NOTE: it is best to look into each color tube to achieve the best electrical focus. For optical focus please follow the manual lens adjustment in the sets service manual
By Larry Dillon

Aug 27, 2009 | Philips 50P8341 50" Rear Projection...

1 Answer

Blank screen audio ok. Picture tube has a line only going up and down

adjust voltage G2 Screen. thats why have retrace line. resolder also CRT board.

May 31, 2009 | Proscan PS50700 50" Rear Projection...

1 Answer

Lines on the screen

Are they thin, white lines running east to west? If so, they are called retrace lines and indicate that the screen settings for the picture tubes is set too high or there may be a mal-function of the CRT driver circuitry. Try adjusting the screen controls which are located behind the front grill of the TV behind an access panel. Once you remove the grill and access panel, you'll see a small control assembly the has two sets of controls. Three for adjusting the red, green, and blue focus, the other, the red, blue, and green screen controls. To adjust correctly, put the TV on an unused input(dark, blank picture) and adjust until there are no visable retrace lines or color in the image.


Feb 14, 2009 | Panasonic PT-51HX41 51" Rear Projection...

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Sony KP65WS500 5 blinks

1st set Brightness and Contrast settings to 50% at tv menu.
You need to cover 2 CRTs with any thing like thick paper while adjusting 3rd CRT.
For example, lets adjust Red CRT G2 volts, Select audio-video input 1 and cover green and blue lens with paper note-book and rotate Screen control up to level where you see retrace lines on projection screen, now decrease screen volts (G2) so retrace lines disappear and projection screen should be blank.
Now do same process with green and blue adjustment while other lenses should be covered.
Im not sure I conveyed it to you properly or not because English is not my 1st language.
Thank you.

Sep 23, 2008 | Projection Televisions

1 Answer

Apex gb5108

'I to am getting only wavy blue lines, no sound, doesn't even show channel indicators. TV was off for 4 days, came home turned it on and ten minutes later this screen appeared, it wont even show the menu screen, different channels or video inputs no sound either.

Jun 21, 2008 | Apex Digital GB5108 51" Rear Projection...

2 Answers

Blue Screen

Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.

Aug 20, 2007 | Sony KP-46WT500 46" Rear Projection...

1 Answer

No picture/vertical lines on screen

it's called retrace lines ,your screens are set to high or focus block assy which has the screen adjustments on it also is faulty

Apr 17, 2007 | Sony KP-53S65 53" Rear Projection...

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