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Tv picture tube is not on for some time and after one hour continous on it works

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Check and replace CRT base connector socket, at the CRT base card. Check all it soldering terminals for loose contact. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result will display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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1 Answer

Screen is turning purple and green dose this cost lots to fix?


It sounds like your tube Shadow Mask may have got magnetised and need to be degaussed.

Turn off your TV at the mains and unplug it for at least two to three hours. Longer the better. After that time power up your TV it should degauss the tube at power up.

Worth a try before you give up on it. Or else get your picture tube replaced. It may be more economical than purchasing a new television. Also try to have the picture tube of an old color T.V as modern picture tubes lacks quality when compared to older ones. But check those tubes thoroughly before buying it.

Apr 07, 2010 | Hitachi 43FDX01B TV

1 Answer

My tv pictur blinks on and off for about an hour and then stays on almost like the tube is heating up or something. Is this a capacitor or tube problem?


pls. check
[1]capecitor 10/ufd/250vdc replace
[2]check or resolder filament registance.
[3]check video trangestor on crt base is dry so pls. resolder.
[4]croma ic resoler itis posibel sum times. pcb after one or two hour heted and banding then is video singnal pin is dry or sperking
problum is not pictur tube becos pictur is on.
if pictur OFF WITH retres line then problum is in side of pictur tube and if yes then solusion is cathod and filament is sort after crt filamnent is over het.
this candetion 2 stap to folow and solve this problum
[1] filament registance velue is high for oregenal velue
[2] tube charging mathod to use and cathod and filament sorting is clear.

Jan 30, 2010 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

Sony trinitron tv when turned on gives sound but no picture. the standby light is continously flashing though. any ideas ?


Resolder all ground connections on the chassis tv. Or maybe picture tube is bad.
Thank you

Aug 06, 2009 | Sony Televison & Video

1 Answer

Vertical jitters on picture - JVC AV48P776


What you are experiancing is loss of High voltage. The line is called a retrace line. It is usally caused by failure of the flyback circuit or aging of the TV tube. This is the single most common failure with CRT based display systems. The high voltage can be tweaked up, to accomidate for the age of the tube. Its a short term solution. Because of the high voltage nature of this circuit, suggest a professional repair.

Jun 29, 2009 | JVC AV48P777 Television

1 Answer

Polaroid ttm-2401


To me, sounds like a picture tube issue. horizontal / vertical controls don't fix it. then its dead.

Jun 22, 2008 | Polaroid TTM-2401 TV

1 Answer

Trinitron wega kv-36fv15 - blinking light continously


yes u need services on ur tv , it could be ur picture tube , if it is your picture tube is not economical to fix

May 28, 2008 | Sony FD Trinitron WEGA KV-27FS100 27" TV

1 Answer

Is my picture tube going?


Most proj TV's of that type have 3 Picture tubes Red, Green and Blue. It's not likely that all 3 went bad at the same time in the same manner. So I believe you have a circuit problem, probably in the power supply stages, possibly a bad solder joint.

Hope that helps...

Geno

Mar 25, 2008 | Televison & Video

2 Answers

Shrinking picture


picture is starting to curve in from the sides like the shape of an hour glass. Is the tube shot? NO. is it something less costly? YES YOUR PROBLEM is in pincushion correction circuit.call skilled tech to fix it. it will not take much time. good luck.

Sep 22, 2007 | Televison & Video

1 Answer

Sony trinitron tv


If you have sound but no picture it means that your power supply and tuner are working correctly. The number of times the timer LED blinks is the code for the problem with the picture. The computer will stop the picture and blink the timer LED if the vertical circuit stops working, if the picture tube is too weak or if the horizontal sweep has stopped. The set should be serviced by a qualified tech familiar with Sony sets.

Sep 03, 2007 | Sony WEGA KD-34XBR970 34" TV

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