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When turn on tv. there a bright line in the middle of TV. After knocked the Tv. The picture will appear. Low weather is high problem

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You have a bad solder connection that will need a new solder job , and it could be on the tuner or on the vertical IC

Posted on Nov 25, 2008

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How do I fix my model tv No picture but knocking sound?


The knocking sound is the high voltage trying to fire. That would tell me that the high voltage splitter has failed or one of the 3 picture tubes (not lamps) has failed. Most likely too expensive to repair a TV that old.

Sep 12, 2015 | Sony Projection Televisions

3 Answers

No picture,good sound


If everything else works - there is sound and high voltage (static on the screen) - but there is no picture (including no on-screen menus), this limits the likely area of problems is the video output circuitry or CRT filament connections. Check to see if the CRT filaments are glowing. If they are not glowing, check for bad soldering on the CRT neck board and around the flyback transformer. Where the picture is erratic - coming and going entirely or changing brightness suddenly, with power off, remove the picture tube socket (carefully!) and clean the pins with fine sandpaper and use contact cleaner on the socket. This source of bad connections can result in a variety of erratic symptoms. Check for bad solder connections on the CRT neck board

Jul 15, 2008 | Toshiba TP55H60 55" Rear Projection...

1 Answer

My tv's screem is little dark


Hello
If you set the lamp mode to LOW POWER, each time you turn ON the TV the lamp will start out at HIGH BRIGHT mode, but will switch to Low Power mode after a short period of time. You may notice a change in screen brightness when this happens. This is not a malfunction.
Just check whether you have selected this mode. Go to its user manual [P57]. All details are there about the lamp brightness settings. If it is not set to Low Power and still you get a dim picture, the lamp may be weak and has to be repaced. OK.

Nov 23, 2011 | Toshiba 65HM167 65" Projection Television

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I have blue arched lines on my sony kp 57wv600 is there a fix for this


Those are retrace lines, the screen controls which are a technical control located under the front gray panel of your tv needs adjusted. This also could be an indication of a bigger problem, most common would be the focus block failing. it could also be of the picture tubes failing but this is not as common or possibly the crt driver ic's. There are specific diagnositc steps to preform to isolate the potental failure. this could lead to the tv going very bright then shutting down.
The first thing a tech is going to do is to adjust the screens and leave, somtimes this is enough, but sometimes it is not. if you want to try and adjust the screen i have an instruction set below, but i must warn you that there are high voltages present when attempting this adjustment and can be dangerous if you are un familure with tv repair.


Turn your color all the way down and the brightness in the middle, then find the focus block, it will be a block with 6 controls one row will say screen the other will say focus near the picture tubes, adjust the screen controls(one control for each color) until the picture has a good black and white look to it, then turn your color up and it should look fine. This is how i balance out the picture. But there is another method that allot of techs use, the other method is to adjust the brightness up until you see what is called retrace lines it is a jagged line going down the screen, once you see these lines back the adjustment down just until they disappear. Do this for all three colors. This method works but on an older set can throw the white balance off because of tube wear.

Aug 05, 2009 | Sony KP-57WV600 57" Rear Projection...

1 Answer

Mitsubishi VS70707 Has developed subtle lines in picture


If they are faint white lines, they are called re-trace lines. They are caused when the current to the CRTs is too high. One way to check is to turn the brightness down. They should go away, but if the picture is too dark, you will need to turn down the "screen" control. This will take some handy work. If you are handy enough, take the grill off the front. Inside you will see a little black box, about 5 inches wide. there are 6 knobs on it, 2 for each color. One row is for focus (each) the other for screen (brightness). It is written on the part. The trick is to turn each of them down equally or risk having a slight tint of color. Really not hard at all, but requires the TV to be on to see. You shouldn't need to turn it but a fraction. Good luck.

Feb 16, 2009 | Mitsubishi VS-70707 70" Rear Projection...

1 Answer

Blue shadows appear to be behind white objects


TV shows large red spot in middle of tv when dark show are on, you can see it more.  Now blue spots on upper right side too.  Spend way to much on this tv to have these kinds of problems only after 3 yrs.

Nov 16, 2008 | Hitachi UltraVision CineForm 55VG825 55"...

5 Answers

No picture but has sound


My LG TV
switch on no picture but short period of sound then nothing

Jan 20, 2008 | Sony KP-51HW40 51" Rear Projection...

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