KV27V55


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KV27V55

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CRTBOSTON
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Jan 31, 2005, 5:27 AM

Post #1 of 5 (2152 views)
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KV27V55	Can't Post

I have Sony KV27V55 - sound OK, but no picture. All checks OK, test points, components & HV looks fine. Anyone has an idea? Could it be that the "user" set brightness to a min level? and if so, how to reset it back? I know that the Sony CRTs in now days not as good as 10 years ago. (didn't check tube yet)

Gene

mel
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Jan 31, 2005, 11:17 PM

Post #2 of 5 (2141 views)
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Re: [CRTBOSTON] KV27V55 [In reply to]	Can't Post

This is the classic symptom of IK shutdown in Sonys. This is caused by a weak CRT and sometimes can be corrected by turning up the screen voltage. You might also want to check out www.FreeFlatScreens.com/?r=10948674 for an opportunity to earn a free replacement for this set with a little effort on your part.

CRTBOSTON
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Feb 1, 2005, 1:43 AM

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Re: [mel] KV27V55 [In reply to]	Can't Post

Where is the screen adjustment for the screen voltage? Is it on flyback or on the CRT board?

I have Sencore CR700, is it possible to restore the tube?

Sorry, can't use your link. Its the customer unit, & I have it for repair.

In some 20" PC monitors I low screen voltage buy putting 5meg resistor instead of 10meg. Is anything possible with KV27V55?

How you deal with problem like this, if it happened so often?

mel
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Feb 2, 2005, 12:03 AM

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Re: [CRTBOSTON] KV27V55 [In reply to]	Can't Post

The screen adjust is on the CRT board on that model. You can try rejuvinating the tube, but I have never had much luck with trinitron tubes. A Sencore may do a better job than my B&K. I have on occasion, isolated the filament circuit on the CRT board and replaced it with three wraps of wire around the flyback core which is in affect a booster. I would do this only with the customers approval and their knowledge that it will be only a temporary fix.

CRTBOSTON
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Feb 2, 2005, 3:27 AM

Post #5 of 5 (2131 views)
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Re: [mel] KV27V55 [In reply to]	Can't Post

I'm agree that sony tubes not good. I mostly dealing with PC monitors. For the last 5-7 years quality down. 10 years ago never had any bad CRT. Now 2-4 years monitor tubes no good.

What type of wire do you use to make "booster"?

One other thing I have to try before burning tube - it could be someone fool screw the brightness to min level... I had PC monitor with digital controls and was no problem, just brightness set to a min.

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