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Difference between colour picture tubes & associated circuits and

I what to know what is the difference between colour picture tubes & associated circuits and LCD daysplay and associated circuits.

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Write the application of color picture tube and associated circuit

Posted on Mar 13, 2010

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I have a Toshiba Regza 32lv 703G lcd tv. I switched it on and I have lost my colour. It only displays in black and white although the menu screen is till displaying in colour. Kindly advise. Thanks!


It is pretty much junk, sorry to say it but your picture tube went out and it is cheaper to buy a new t.v. My grandpa use to fix them for us for free but he passed:( If you call some where see how much they would charge for a picture tube, I bet it's expensive???

Jan 15, 2012 | Toshiba REGZA Televison & Video

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Cathode emission check for colour picture tubes


<p>How to check the colour cathodes of a picture tube for emission<br /> <p> <br> <p>It is very easy to cehck the emission of the cathodes of a colour picture tube. Assuming all other circuit parts are working, including LOT [Line output Transformer] and video output section.<span> </SPAN>There is proper screen voltage; focus voltage and EHT [Extra High Tension]. Locate the three cathode points on the base card, usually marked as Gk, Bk and Rk.<span> </SPAN>Keep the brightness, contrast and colour control to zero position.<span> </SPAN>Take a wire of suitable length, say 50cms or so, tie its one end to TVs chasis [negative].<span> </SPAN>Take one resistor of value 100K 1W, tie its one end to the other end or the wire, thus one end of this resistor is now connected to negative chasis and the other end of it is free now.<span> </SPAN>Hold this resistor with with some electrically noncunductive material [using hand gloves will be better]; switch on the Tv, wait a minute or so to get it warm up.<span> </SPAN>Just make a touch at each cathode of the picture tube base card solderings.<span> </SPAN>Just one touch will give you a colour of the respecive cathode on the screen.<span> </SPAN>Never hold it for long time. This process can be used for checking cathode emission of any type of Cathode Ray Picture tubes. <br> <p>

on Apr 18, 2011 | Televison & Video

1 Answer

Three coloured lines appered on the screen - no picture


If there is no picture and 3 vertical lines in the center of the screen, stop. Turn off TV. You have no horizontal deflection happening. Lines will burn into crts and be permanently visible after repair.

No horizontal deflection is caused by Horizontal sweep circuit failure, maybe flyback transformer and associated components. More than a simple do-it-yourself repair.

easyab

Apr 22, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

LCD COLOUR


I have the same problem with a DCR-HC45.The culprit is the ribbon between the circuit board and the LCD display,but my problem is worse,sometimes the screen turns white and I can't see anything on it.I have no idea from where to buy a replacement ribbon but I know how to replace it.

Jun 23, 2009 | Sony Handycam DCR-HC30E Mini DV Digital...

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No red colour in my lg lcd monitor ..red colour setting doesnt bring any change i screeen..pls suggest some solution


it is very simple, by default in monitor circuit RGB (Red, Green, Blue) tube is installed. and in combination of both of three colors we are able to view colorful image. due to non functionalty of Red color u r not able to view red color in screen, either you replace picture tube or purchase new monitor. coz cost of this tube is equal to monitor.

Jun 05, 2009 | LG Flatron F700P 17" CRT Monitor

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When switched on the set gives a picture for 2 or 3 seconds and then goes black but sound remains. Remote changes channel but still no picture.


hi sir,,
there are only three things to check which causes these problems...

first check whether the cathode ray tube is ok or not
second whether the fuse is damaged
third is the colour wheel,,,
if these are not defnility the circuit problem,,,diodes capacitors

thank u,,,,,

Mar 06, 2009 | Hitachi 26LD6600 26 in. HD-Ready LCD...

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Colour Problem with ONN crt TV


TV's will show funny colors because of magnetic fields affecting the face of the picture tube. A "degaussing" circuit (a coil of wire around the tube and some kind of control circuit) is supposed to try to neutralize this when you turn the set on. Sounds like it's not working correctly in your TV, or may not be strong enough to counter the field.

A real cheap set may have no degaussing at all, or may have a manual degauss button on the back. Does the owner's manual tell you anything? The connector from the coil to the circuit board may be loose. Try reseating it. (Be careful if you take the back off your TV. Make sure it's unplugged, and be aware some parts - especially the picture tube - can store a charge for a while after the set's off and can give you a nasty jolt.) It's also possible the tube is defective, but unlikely unless the set was dropped or exposed to a large magnetic field (like kids playing with a magnet near the face, or turning off a vacuum cleaner right in front of the set).

Hand-held external degaussing coils are available (check eBay). But without seeing exactly how bad the color is under what conditions it's tough to say what's best to try.

Jun 30, 2008 | Televison & Video

1 Answer

Phillips tv 32pw9544


it is 100% sure that your tube is ok.

there are few problems in different section like 

  • sound section for no sound
  • video & crt base  due to low light in picture.
  • red video output circuit.
  • though problems are very easy & can be fixed at your house.but you need skilled technician.

Oct 16, 2007 | Televison & Video

1 Answer

Lcd tv picture wavy, black and white


by calling the tech they will answer your problem they will verify the problem in your colour circuit, the colour crystal or other related circuit could be your problem,the tech will give you the answer.good luck.

Apr 01, 2007 | Dell W2600 26 in. LCD Television

2 Answers

Pic Bleeding


this sympton is characterized by the presence of red, cyan, green, magenta, blue or yellow colour in a supposedly plain white raster. proper colour reproduction cannot be expected if the raster is coloured. this symptom is caused by a poor white balance adjustment of by a trouble in the CRT, colour amplifier, color demodulation or colour output circuits. if the raster has a tint of red or cyan, check the R-Y output circuits and the first grid, second grid and cathode circuits of the red electron gun. but if you dont know anything about this, just bring it to a qualified service technician. good luck!

Jan 21, 2007 | Sony KV-35S45 35" TV

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