Question about Televison & Video
Have a problem of continuous yellowish color & flicker sound in eht
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Posted on Jan 02, 2017
the crt socket may be bad or crt board may have loose connection or chroma and or microprocessor ic has poor solder joints good luck
Posted on Jan 21, 2009
SOURCE: Green Display Problem
The problem you described is more then likely related to the video processor. Possibly also some power supply issue, since the audio section is being effected also. Or this may be two unrelated problems in that case the video processor and the audio processor and amplifier should be suspect. This is how I would handle this problem:
1) Get the schematic for this TV
2) Tackle the video problem first
a) Locate the video processor connect a known video source generator (I use the Sencore VA62A) and take voltage measurements and compare them to the schematic values (For red, green, and blue), if the values are not as they should be, use and oscilloscope to look at the waveforms of the video section and compare them to the schematic values if they are not as they should be, change out the video processor. Retest the TV, this should take care of the video problem.
3) Tackle the audio problem
a) Using the audio section on the VA62A inject a 1000Hz tone into the TV and using an oscilloscope check the input to the audio processor and the output of the audio processor if you do not see a 1KHz sine wave on the output check the voltage levels and compare them to the schematic, if they do nor match change out the processor, if they do match and you see a 1KHz sine wave at the output of the processor, then check the input and output of the audio amplifier stage in the TV if there is no audio at the output change out the amplifier.
This is a good starting point, now I must be frank with you, I run a TV repair business and I do understand that you may not have , Video Signal Analyzer or Oscilloscope, and Video/Audio Signal generator, or even a multimeter to do this job correctly, so since I have told you how I would do this job and you can follow the instructions given and solve your problem, Let me advise you on what you should do,
If I were you and did not have the above equipment nor experience in electronics, I would take the TV to a qualified TV repair center and have it fixed there since they would have the necessary equipment to do the job properly.
I hope this helps,
Posted on Jan 21, 2009
The light engine is going bad. To be specific the color wheel is wearing out and cannot be replaced seperately as it's part of the light engine. Mitsubishi extended the warranty on the light engine for an additional two years. You need to contact a local Mit's authorized service center to see if yours is still covered. Better hope so as the light engine is expensive.
Posted on Jul 09, 2009
The tech is very likely correct. The EHT or flyback transformer can develop hairline cracks that allow leakage of high voltage that exists in this circuit. There are other related components that can also cause this, but the transformer is the most likely. This area in the set also builds up allot of dust also due to the high voltages and this aggravates the issue. I do not recommend operating the set very long this way as it may begin arcing inside and cause more components to fail. Replacing the part would depend on how much you want to invest in the unit. Get an estimate and go from there. Good luck.
Posted on Nov 25, 2009
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