[TechAssist] Sanyo DS31580--Looks like open filter
- From: "Tri-County Tv" <tricountytv@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 29 May 2003 10:54:21 -0400
Hello fellow techs,
Customer complains of white band across the
picture, got it on the bench and seems to work fine except for 2 small lines
moving up the screen, these lines are about as thin as 1 scan line and are
separated by 2/3 of the screen. If we unplug the set from the isolation
transformer and plug it into a non isolated outlet, the picture becomes very
distorted with 2 large wide bands of distorted picture move up the screen and
sound has a load hum, looks like open filter. I replaced main filter cap and
few others that were marginal, replaced tuner isolation box, checked the ps
diodes for leakage, maybe one of the ps diodes is leaking under load? What gets
me is the fact that the isolation transformer makes it almost go away, so I am
thinking some sort of grounding issue. It uses a STR30130 regulator and if you
very the voltage to the set picture is rock steady. I do not have a schematic
and sams does not cross, help, I am Stumped.
Tom Berger
Tri-County TV
Robbinsville
North Carolina 28771
(tricountytv@xxxxxxxxxxxxx)
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