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 Post subject: Sony TV5-307UW question
PostPosted: Nov Tue 19, 2019 2:39 am 
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Location: Warner Robins, GA
I have a Sony TV5-307UW that I had originally got working by replacing several electrolytic caps on the deflection amp board several years ago before the transition to digital OTA TV. Pretty sure it had the issue then, but I cannot remember as its been so long.

Fast forward to 2019 where I decided to put the TV to use and proceeded to modify it for a composite video input and in so doing I went ahead and replaced all the rest of the electrolytic caps and resistors on both the deflection board and sync board.

I did the caps first which made some raster improvement.

Due to parts availability and my desire to use the TV I replaced the resistors in stages and with each set of resistor replacements I saw marked improvement in the raster.

I finally completed the work and noticed that the focus control has to be turned almost to one end to achieve proper focus and when I turn up the brightness control it gets to a point where the raster begins to increase in size and the focus changes.

Is that normal for this TV or is there a problem?

The picture looks fine otherwise.


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 Post subject: Re: Sony TV5-307UW question
PostPosted: Nov Tue 19, 2019 12:46 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: dayton oh usa
sounds like blooming.
weak hv rectifier?
iirc this uses a multiplier with 3 rectifier tubes.


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 Post subject: Re: Sony TV5-307UW question
PostPosted: Nov Tue 19, 2019 2:13 pm 
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Location: Warner Robins, GA
Perhaps.

Will need to get my HV probe to measure the HV and see how close it is to the listed value.


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