Sony KV-36HS500 TV

Rob

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Aug 15, 2007, 6:11:57 AM8/15/07

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I am having some problems with this 36" tv. Sometimes it will turn on
and sometimes it won`t. I had it on all day last Sunday and shut it off
and the next day it would not turn on. It will make the usual clicking
noises from the relays and the standby light blinks, but thats it. I
have tried to hit the side to see if I had a bad solder joint or to see
if something might be loose, but it was no use. I do have a service
manual for this and according to the 7 blinks from the standby light it
indicates "horizontal deflection stopped". I just wanted to check to see
if someone might have run into this problem on this series of tv before
I jump in and start checking things. Thanks, Rob

electrotech

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Aug 15, 2007, 7:29:44 AM8/15/07

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Once i've had a similar problem with a Philips TV set, and it turned
out to be a very thin crack in the solder joint on the flyback, very
difficult to see, and gave very odd symptoms a bit like the ones
you're describing. A magnifier might help to see these cracks.
Otherwise, supply problems, try to see with a scope how is the supply
of the flyback.

Hope it helps. Good luck!

Leonard Caillouet

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Aug 15, 2007, 8:29:10 AM8/15/07

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Most likely one of the regulator ICs. You need to start by changing the
MCZ3001D in both the HV and Horizontal drive circuits. They are cheapest if
you buy them under the Hitachi part number rather than the Sony, which I do
not recall at this time.

If that is not the fix, you could have any number of problems and these are
difficult to troubleshoot. The next most likely thing would be the flyback.
The ICs fix most of them.

Leonard

"Rob" <robn...@woh.rr.com> wrote in message
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Rob

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Aug 15, 2007, 5:27:10 PM8/15/07

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Thank you Leonard, I heard something before in reference to an IC in the
power supply. I will pop them in and hope as this is a very complicated
piece of equipment. I been working on electronic equipment for years,
but this would be a head ache for the most experienced! Rob

Rob

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Aug 15, 2007, 5:34:40 PM8/15/07

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Thank you for the tip. Thats what I was thinking at first, but I figured
by hitting it on the side would have some effect if it were just a loose
solder joint. It still didn`t do anything, but I have seen bad solder
joints where hitting it had no effect. I had someone else tell me about
the regulators on this set. I had read something about that at one time
on the web somewhere. I am going give that a shot. I hope this tv
doesn`t turn into a difficult project! Rob

Leonard Caillouet

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Aug 15, 2007, 5:43:59 PM8/15/07

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The Hitachi part number is CP08451U, btw. I just read your replay and I am
at the shop where I could check it. The latest version that I have received
from Hitachi is the MCZ3001DB and they have worked fine in the Sony sets.

Leonard

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Mark D. Zacharias

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Aug 16, 2007, 7:00:48 AM8/16/07

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"Leonard Caillouet" <nos...@noway.com> wrote in message
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Usually just IC8002. B & D Enterprises has them for 9.00 each.

800-458-6053

Get the DB version, it's improved.

Mark Z.

Rob

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Aug 16, 2007, 7:34:54 PM8/16/07

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Thanks for the info Mark! Rob

Rob

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Aug 17, 2007, 9:25:32 PM8/17/07

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Thanks Leonard, the IC`s did the trick! I am glad it fixed it, it would
not be fun to troubleshoot a tv that big. Rob