Riddled TV Repair Forum

1968RT · Joined: 13 Mar 2010 Posts: 51 Location: michigan

Hi everyone, just discovered you. My TV - Sony model KV32V25 made in Feb of 1997. Over the last 2 months the turn on time for the picture has gotten longer and longer - up to about 10 minutes now. After it comes on it flashes on and off for another 10 minutes. Sound comes on right away. After the picture stabilizes it will still intermittently flash off and on. Some other question and answer sites, while not discussing this exact Sony model. talked about looking for bulging caps. Two questions- anybody have an idea what the problem is and is there a site to download a schematic for free? At the moment I don't have any paperwork(schematic, parts list, etc) at all. A fix it yourself site sells instructions for making adjustments that might help, but the way this set has got worse suggests to me any adjustments would only be a temporary solution. Thanks in advance for your time and help.

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kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

your CRT is dying. Sony has taken the liberty of deciding that for you. As the picture degrades your TV monitors the picture quality, the IK circuit blanks the pictures when it determines that the current levels are not up-to-snuff.

The best temporary solution I know of is to turn up the Screen voltage, but it will only be a matter of time before that no longer works. maybe 6 months.

1968RT · Joined: 13 Mar 2010 Posts: 51 Location: michigan

That stinks because I see no degradation in the sharpness, focus, brightness, or color. Is it a case of Sony forcing me to buy a new TV, or will the picture actually be getting bad very soon? Thanks for the info.

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

all depends on your perspective. I'm sure the video has degraded some. But beauty is in the eye of the beholder.

On the plus side, open the back and find the knob labeled screen, and turn it to the right slightly. It should fix this problem for a good 6 months or so.

Jesse Mack · Joined: 22 May 2008 Posts: 600 Location: The Last Frontier

I would suggest that the picture quality of your set IS poor and that the condition has come about so slowly that, to you, it is completely normal.

This is the check: Play back a Black and White picture (one that was recorded that way) Turning down the color is not good enough.

Or: Turn to the history channel if you have cable. They broadcast Black and White prigramming a lot. (old WWII films).

While viewing a black and white movie, You picture should be shades of grey. Be honest with yourself because you most likely will have shades of red. This is the most common failure.

Also, For everything there is an end, Even us. Your set is 14 Years old. I do not think you will get that much time on ANYTHING you currently might buy.

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1968RT · Joined: 13 Mar 2010 Posts: 51 Location: michigan

Pulled the back of the tv off today. Preliminary results are very good. Found the screen pot on the flyback. After turning it clockwise thats all I had was retrace lines with side pincushion. Turned it down a little and had a picture wirh retrace lines. Turned it down a little more and the retrace lines went away. The set turns on after about 15 seconds and stays on. The degree of adjustment ended up being very small. I appreciate that small changes over a long period of time can go unoticed. As I write this I am watching a b&w movie on tcm. There is absolutely no color in the picture other than white, black and grey. I guess what makes me mad is I should be the one who decides when the picture quality is unnacceptable. A lot of homes have a "pecking order" of tvs. As new sets are bought the old set goes into the bedroom, basement, kids room, garage, etc. It seems as though in this case I will be deprived of this option. Thanks for all the good info, advice and discussion. I have a small collection of antique radios. I may need some advice on those, or is this not the proper forum?

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

you can post your antique radio questions HERE. I have no idea how much luck you'll have with responses. Only one way to find out.