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Blank raster hi! i've a 29'' colour tv which is giving me troble. it does switch on and have almost all function. the problem is it does not tune for local stations but it keeps on scanning . the other thiong is it does not have raster insterd its white and blank. Please help

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Re: blank raster - Standard (CRT) Televisions

Check eeprom

Posted on Dec 23, 2007

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Hi 29 inch Tv having problem of no picture, in dead condition with small ckiking noise.

1) this conditions is lack of raster.
2) test the video detector, flyback, horizontal output transistor, rectifier Hv, see the block diagram

God bless you

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Dec 30, 2007 | Standard (CRT) Televisions

2 Answers

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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!

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3 Answers

Tv seems ok by static and now, no sound (or very faint)

The problem you're describing sounds like a tuner problem. BUT you say that you have the same problem with A-V input too. That's weird!!! Possibly the electronic TV-AV switching circuit is messed up and stuck in the TV (tuner) position. If this is the case you DO have a tuner problem and a switching problem too.

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