Question about Astar LTV-32HBG 32 in. LCD Television

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NO PICTURE white screen with no video or sound

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Hello,
Have you check the power supply first? that could be the problem.
Please call 323-767-6030 I will go through the trouble-shooting, with you.
Thank you,
Ivan

Posted on Mar 12, 2009

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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

White screen


T'Con board fault. Check and replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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Rca modeld52w136d dvd combo sound but no picture


are you using RCA jacks? if so make sure that you put the yellow cable in the video out spot ( out to tv) it will have a yellow ring around the opening just like the red one and the white one. ( red and white are for sound only)

Mar 30, 2012 | RCA Televison & Video

1 Answer

My screen is grey/white and no picture


The LCD controller (T-Con board) or main board needs to be replace to fix the no video failure.
Check this link to find parts for your LCD.

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Safety 1st High Def Video monitor screen white


Hello,

You can call this number : (800) 544-1108
(7 a.m. to 6 p.m. EST Monday through Thursday,
and 7 a.m. to 4:30 p.m. EST on Fridays


Thank you

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Panosonic DLP projection, 60 inch, 1080i. The screen goes white and stays white. I have sound, but a white picture. is it shot?


Definitely sounds like a circuit video problem. Have it checked by pro/tech or exchange for new one

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1 Answer

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is the white line in the middle of the screen going left to right, if thats the case then sounds like a frame collapse, get it checked by an engineer

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