Question about Sharp 21B-S10 21" TV

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Dim raster of tv - Sharp 21B-S10 21" TV

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Check heater safety resistir.increase screen grid.check this board another tv.the board working normal in another tv.than change picture thank you

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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Power light is on but no picture


you did not mentioned if you have raster or none, if your tv has raster but no picture your problem is in your I.F. section and your tuner, now if no raster, you can check your power supply, check your 5volts, 9volts, and 12volts check any alternatives that cause of no picture..

Sep 09, 2013 | Toshiba 40RV525U 40 in. LCD TV

1 Answer

Thin diagonal lines on screen. How to adjust whit balance ,screen end focus?


Is that diagonal thin line about 10 to 20 degree slant? And then you have a very bright raster?

Then you set the flyback(for tube tv), I think its "screen" voltage is set too high adjust it slowly to lessen the brightness. It is commonly a small pot on the side of the flyback together with the focus pot.

If you have raster turn the tv on, use insulated screw diver, then slowly turn the knob to the direction(CC or CCW) where your raster go dim.

Be careful your dealing with live and high voltage. If your not inclined on electronics better not to.

Oh BTW, set your settings to normal.

Sep 30, 2009 | 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

No power indication,no rasters,and no sound. Only click sound.


Go to the Anantek website and search for your TV or similar TV's to see if anyone has posted repair hints. I've fixed several TV's and other electronic equipment from their website.

Jan 29, 2009 | Televison & Video

1 Answer

Sharp 32'' tv -no raster showing channel numbers only


since you have sound and display it's not the hivoltage. You're electron guns are not being turned on. Most likely the IC which biases the guns or the IC which contains the biasing resistors.

Jan 28, 2009 | Sharp 25R-S100 25" TV

2 Answers

SONY KV-XF21M80


maybe the bytes of the memory are not enough for this case^_^

Feb 21, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Sanyo TV Model# DS32224


This is usualy because there is either a high voltage regulation fault, or a main power supply regulation fault.

There are many things that can cause this. When the high voltage goes too far down, the raster will enlarge. High voltage regulation can be caused by faulty components in the feedback sensing, or in the high voltage multiplier, or in the flyback windings itself.

A quick way to sort of know if the high voltage is regulating is to wind the brightness and contrast from one extreme to another and observe the raster size. If the raster is changing size with the brightness on the screen, the regulation is not working well. In some of the low cost sets there will be about a 2 to 5% raster size shift in this case. The high end sets will have a near 0% shift in the raster size. A size change of about 2% is acceptable for most sets. If the CRT is weak, this test will not work well, because a weak CRT will not properly load.

If the main power supply is operating slightly over voltage, the raster size will increase. Usualy, the brightness will be a little on the high side when the supply is too high. Voltage regulation faults can be from warn components in the voltage regulator area, or in the feedback control.

This should be looked after by an experienced TV service tech. This type of fault can be involved.

Jerry G.


Nov 09, 2007 | Sanyo DS32224 TV

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"...

1 Answer

Sony trinitron 32 in. pip no video, (raster, with audio)


What you have described there is a classic example of the jungle IC failure. Ic301 Sony p/n 8-752-101-04. A pic with no color, and lines or grainy texture in the picture. Not a project you want to tackle if you don't have the proper soldering equipment or skills. And not a costly one at a good repair shop.. Only real hurdle is getting that heavy monster into the shop. To answer your question, yes what you described there is raster. Even the salt & pepper looking screen with no real decernable image is described as raster. In fact any image generated on the CRT is raster. And yes, these sets are prone to solder joint problems, usually ring cracking in circuits that generate the most heat.

May 20, 2007 | Sony FD Trinitron WEGA KV-32FS100 32" TV

1 Answer

I need to know how to access the verticle hold to adjust TV


what do you mean that the picture streched out.this is a strange problem.as vertical problem does not strech it either have a line inthe middle of the raster, shrink both at the top and bottom of raster,lines run up and down on the raster.kindly explain your problem in detail then i will be able to help you.

Mar 19, 2007 | GE 31GT659 31" TV

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