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
Sam

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Try replacing the STK- chips

Posted on Mar 20, 2008

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6ya6ya
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Posted on Jan 02, 2017

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White Raster with thin lines; Sound Ok.


White raster with retrace lines: No picture, Sound OK
(picture tube based telivisions.)

It is a common fault to occur in most of the CRT based telvisions, regardless of which brand it is. There will be sound OK, and a bright screen with thin white horizontal lines across; at about an inch space, all over the screen area. This fault may occur along with colur shades also, like blue screen with white retrace line, red screen with white retrace lines, green screen with white retrace lines. Let us take the first case. A white raster with white thin retrace line acorss the screen. These are call vertcial retrace lines technically. To make it mor understand, we have to go to some picture tube electrode details. There are three colour cathodes for a colour picture tube, Red, Blue and Green. Two girds are there called Focus and Screen. Focus grid is supplied with focus voltage which in turn determine the cocus of picture, and screen grid is supplied with screen volrage which determine the emission of the picture tube; in short. There is a final anode to all the picture tubes, which supplied with Extra High Tension voltage, can be located at the top side of the picture tube, to which the EHT voltage from LOT is connected with the help of rubber ****** and clip. Without these three voltages, EHT, Screen and Fcous, no raster will be produced. Therefore in our case, there is a raster, so, horizontal output section including Line Output Transformer [LOT] is functioning well, and as far as sound is there, tuner and video IF section are working well. In fact, all other section except, video output section is working properly.
There are three cathode points on the base card, marked as Bk, Rk and Gk. Check the voltages of these three cathodes. In our case, it will be very low or approximately equal to zero. When cathode voltages goes low, emission of the CRT increases, is the reason. There must be a voltage between 120 and 135VDC at these points. Find out the reason for this voltage drop is the next step. The video drive voltages in most TVs comes from LOT windings, after rectification and filtering. There will be one reisitor of low value, say one Ohms or so, will be connected series with this winding, in between diode and winding. Check the voltage at the cathode of this rectifier diode first. If found low replace the diode and the smoothin capcitor. The smoothing capacitor will be between 33 and 47MFD 250VDC rating. Replace both of them. If there is volatge, say 200VDC or so, check whether this voltage comes to the CRT base board or not, If not, check the conducting wire, serial resistors; if used for open. There is no chance of transistor shortage at this time as the raster we see is white. If raser we see have a specific colour predominent, that is green, blue or red, check the revalent video out transistors and replace it. It is best to replace all the three video output transisors at the same time with same batch and number.

on Apr 18, 2011 | Televison & Video

1 Answer

Lcd tv goes blue screen


Blue Screen usually means you have no video source, but also it can be a bad cable, bad signal, or week signal. I will try to hook it up to a dvd and test it on another source. However the screen should be all blue aand not blue lines, if you can email me a photo of the screen I will be able to properly address it.
Tony Mitri
goldtekfl@hotmail.com

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/tony_a41fa0b801734e2f

Feb 15, 2014 | APEX Digital Inc. Apex Digital 32" 720p...

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

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.

michtech

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

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...

1 Answer

Apex 32" TV - Blue Screen & Channels keeping running/changing


blue screen indicares that there is a problem in blue cathode circuit. please check 1 blue video output supply. 2 blue video ckt defective 3 signal from chroma ic to blue cathode missing. 4 loose connector 5 crt base loose. 6 chroma ic defective. I think sound will be ok .

Sep 22, 2007 | Apex Digital PF3230 32" TV

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...

1 Answer

Lost audio & video


You say that you lost audio and video but the screen is blue. That indicates that the majority of the circuits are working OK. To display anything on the screen the high voltage and drive circuits would be working ok. Try an input other than cable (the tuner input) and see what happens. If your unit works through those inputs then you have a bad tuner or matrix IC. If that doesn't give you any results then you probably have a microprocessor issue. The bad news is that Apex does not support their equipment so if the problem is not simple it will probably not be reparable. Good luck.

Jun 13, 2006 | Apex Digital AT2008S 20" TV

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