Question about Flat Panel Televisions

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Hi there,it looks as if you have a frame collaps,this is the first time i have ever heard of this on an LCD tv,i take it that there is no picture at all only a thin line.

Posted on Feb 03, 2008

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The most common cause for the loss of picture is a bad Horizontal Output Transistor (HOT). but I would suggest you get a detailed estimate. I think that this would cost you about $60.

The horizontal lines means the vertical amplifier or deflection system has failed. There are over 100 components in this section and any one of them, or most of them can be at fault. However, the most common failure is the VOT or vertical output transistor (which is often buried inside a chip).

The repair will cost around $250 plus or minus.


ONE: Do a hard reset (just to make sure there is nothing in the coding that is fowling things up). Unplug the power cord; leave it disconnected for 4 hours. That will restore everything to factory defaults when you power it back up.

TWO: Do the "whacking test" by banging your fist on a few strategic places to see if there are any cold solder joints or loose wires acting up inside the set.

If the above steps don't solve ur problem then I suggest you to go for a repair..


Posted on Feb 21, 2008

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SOURCE: We have a Hitachi 42PMA300A

Hi, when I open it got the sound but no picture?

Posted on Jan 02, 2011

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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 | Flat Panel Televisions

1 Answer

Why my Sony LCD TV KD40v3000 is not displaying any pictures ? Please help if possible!

If you wish to get some details; check the site linked here. Pull up older posts.Surf the site with patience.
Line, faults & possible causes to LCD screen are given with illustrations.

Aug 03, 2014 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

1 Answer

Why has my sanyo flat screen television only got coloured horizontal lines across the screen?

That might be an issue with the TVs picture tube if it was not one of the LED or LCD TVs. Please get a technician changed it. If it was any one of the LCD or LED TVs, then it would be more expensive than you expect.

Jul 20, 2014 | Sanyo Flat Panel Televisions

1 Answer

A horizontal white line is appears in my LG Flatron colour tv in the middle of screen suddenly and the pictures disappears but the sound keeps on but when i restart the tv the pictures comes what would be...

Tap the top of the TV and if the picture comes on in full screen then it is possible that there are DRY SOLDERING points on the board.
use a good iron to touch up the soldering on the vertical and horizontal sections, the driver IC's. get help if you are not able to do the job but it seems a minor job.

Jul 05, 2011 | Flat Panel Televisions

1 Answer

Hi i have a sony PFM42X1 has vertical lines over entire screen, on turn on. has a horizontal line across the middle of the screen. the colour is mixed pink,yellow and green. you can see the ghosting of...

I seen 2 post with same problum diffrent explations, I have the same TV with the same problem. I am sorry that all the answers are so silly and basic. I just open up mine to check all the compositors to see if their are any Bulging or to see if anything looks damage. I will pull the Power supply and start checking the compositors. and let you know. I will look in other places first to see if I can get some REAL Answers. Poco Zocko Actor


Oct 02, 2010 | Sony PFM-42X1 Plasma TV

1 Answer

Coloured lines on screen

Make sure first that the picture is centered by using the remote control to move the picture vertically and horizontally. Use the round pad towards the center of the remote and push the button according to which direction you want the frame to move.

Sep 10, 2009 | Philips 42 in. Plasma TV

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