[TechAssist] Re: Samsung TXG2746 turns off when volume is adjusted
- From: ray clarke <ray260@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 3 Nov 2004 08:53:50 -0800 (PST)
I think you posted this under the wrong subject.Sorry
I can't help but probably better results by
re-submitting under RCA. Ray
--- Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx> wrote:
> model ps50700yx4
> chassis ptk195f2
>
> Symptom: Dead
>
> Parts Replaced: ihvt
>
>
> Comments:
>
> History:
> This unit was in for service under Thomson warranty
> in Oct. '02, shorted
> q14401 and defective ihvt t14401 239111. "previous"
> work was noticed,
> but not fully documented, except for poor solder
> work, trace/jumpers on
> U14601.
>
> Unit failed again and was in for repair in April
> this year, 2004. This
> time both the ihvt 239111 and the blue focus block
> 246457 were bad.
>
> Now:
> Again the unit is in for repair, the ihvt is bad.
> Checked caps c14402
> and 14800, diodes. Tested with Sencore analyzer.
>
> Installed a new ihvt and scoped the HOT. Unit
> failed after a couple of
> seconds, before the tubes came up.
>
> The replacement IHVT now rings 0, as with the old
> one, a new one rings
> 50+. Measured pin 5 to HV lead with cap leak
> checker to test HV diode
> stack. The bad ihvts pull twice the current of a
> new one.
>
> Something is causing the HV diode stacks to fail.
>
> Any ideas?
>
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
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=====
Ray Clarke
Billette TV Howick, Que
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