[TechAssist] Re: Samsung tv model# TXH 2556 chassis# KCT57A


Barry, While the set is running try gently tapping the neck of pix tube. You
may have an intermittent short.See if it flashes when tapping.Tube may
require a clean/rej or a short remove sequence.If so place unit on it's face
when doing this so any debris will fall down to bottom of tube,the face
side....Don...
HARTS-TVCR''ASC''
9-Robert St.,Oromocto,NewBrunswick,CAN
Tel#506-357-9785Fax#506-357-6010
----- Original Message -----
From: "Barry Appleby" <burintv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, March 31, 2002 8:18 AM
Subject: [TechAssist] Samsung tv model# TXH 2556 chassis# KCT57A


> Hi Guys . This one came in with the HOT shorted . I replaced it and the tv
> played for about 10 hrs with everything looking good but all of a sudden I
> noticed the picture flash and an arking sound so I turned it off   . I
> turnedit back on after hooking up the scope and it has played for about
> another 5 hrs or so with no problems whatsoever . I shouldn't have turned
it
> off  but it wasn't connected to the issolation transformer and couldn't
hook
> the scope to it .   The HOT wasn't even getting warm and it's collector
> pulseis good with a B+ of 129.8v , 1119 volts peak tp peak and frequency
of
> 15,734 . It's delta time is 11.8us with a good symmetrical pulse shape and
> looks clean , no ringing . Before I replaced the HOT I did a ringer load
> testand  ran the set with the TVA92 and all measurements looked good . I
> knowthe HOT is being taken out by something but what I don't know . This
one
> has a FTH29001 flyback and I did notice the yoke has a higher than normal
> buzzing sound but no signs of arking when I removed it . I looked in wins
> tips but nothing on that model for a HOT failure . If anyone  has
> encounteredthe same problem or has a tip or suggestion on this one I would
> appreciate it ? Thanks Barry .
> Barry Appleby      Burin Tv Repair ,              Burin Nf
[709]891-2356
> .   burintv@xxxxxxxxxxx[1]
>
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