Question about Konka K2386U 23" TV

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Poor picture, raster & sounds ok

Which circuit is responsible for these problem

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If the picture is fuzzy (out of focus) it may have a focus adjustment on the flyback transformer. Possibly an adjustment available from the outside, through the back. Look for any markings on the plastic housing indicating Focus, Brightness etc.. You can use a small screwdriver through the labeled holes in the case to make adjustments.
If the picture is crisp, but faint or the colors seem washed out it may be the tube is at it's end of life or needs to be rejuvenated. TV shops can rejuvenate tubes but it's not cheap.

Posted on Mar 12, 2008

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Posted on Jan 02, 2017

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1 Answer

My Visio flat screen tv model E320i-b2 has sound bot no picture, why?


Because something is wrong with the video circuits of the set - that is why the audio works and the video does not. If you want to attempt a DIY repair suggest you find out which board on the set is responsible for creating the raster or video on your set and start looking there.

Jul 13, 2015 | Televison & Video

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When tv is powered on tv only displaying channel number and sound -no raster. using video mode displays are ok. sound is also ok


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. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Dec 06, 2014 | Sharp Televison & Video

1 Answer

Picture cutting after 5-10 min-raster OK sound OK


The vertical ICs on this particular model have by now bad grounds. You will have to resolder this, and check any and all grounds on ICs mounted on heat sinks! Bad grounds are common and plentiful. Good Luck and thanks for asking!

Jul 04, 2010 | Sony Televison & Video

1 Answer

IM A TV TECH. I HAVE A SONY LCD KP-60XBR800 I HAVE NO RASTER. POWER OK, MENU OK BUT NO RASTER ON TUNER, TUNER VOLTS OK,CAN YOU HELP ME PLEASE. THANKS my email sergioaguirre0182@hotmail.com


check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.---- a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.---- with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT. excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen. check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines. -------- for getting any required parts to replace you can get it from www.radioshack.com or from www.partstore.com or from www.shopjimmy.com --------- thanks.please do rate the solution.thank you for using fixya.keep updated.

Sep 06, 2009 | Televison & Video

1 Answer

Sound problem


 

  1. no picture &no sound raster ok.

 

  1. your problem is in tuner to vif section.
  2. check supply to TUNER & VIF section .
  3. check loose contact in above section.
  4. check components in VIF section.
  5. for ckt open the web site & download it fron there as given here.
  6. hope this will help.
  7. good luck.

http://www.eserviceinfo.com/index.php?what=search2

Oct 11, 2007 | Televison & Video

1 Answer

NO PICTURE


do you see anything on screen.no picture doesnt mean no raster ,raster mean anything that comes out in display.no raster with sound only mean failure in either,connection in heater which means, loose connection or some new sets declare failure in vertical circuit.so be more specific ok?

May 08, 2007 | Sony FD Trinitron WEGA XBRKV-40XBR800 40"...

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

1 Answer

Tv showing blue screen with flyback lines sound ok


Flyback lines? Is the picture all white with no brightness control with faint horizontal faint lines? If this is what you are saying, the screen voltage could be bad, and if thats the case, the picture tube or the flyback itself could be bad. You could also have a bad connection on the crt socket

Dec 27, 2006 | Philips Magnavox 20MT133S 20" TV

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