[TechAssist] Re: Sansui?Orion model TVS3245 FIXED

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 24 Feb 2004 13:26:45 -0600

Fixed
problem was open IC402 (KIA78L09BP-AT) +9 volt for "P Con" supply to video
amp IC702 and audio circuit
funny thing is audio was OK


----- Original Message ----- 
From: <tvservice@xxxxxxxxxxxxx>
To: "Tech-Assist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 19, 2004 5:34 PM
Subject: [TechAssist] Sansui?Orion model TVS3245


> No horizontal/vertical sync (picture rolls sideways and downward)
> Tuner and external inputs same symptoms
> Replaced IC601 and Q606 No change ( have repaired others with same parts)
> Menu OSD is rock solid
> Only voltage discrepancy is IC601 pin 10 is +7 tenths volt, schematic
shows
> it as +7.8 volt
> Tracing pin 10 (AFC flyback pulse) back to flyback only has 2 resistors
and
> 1 zener
> All good
> Waveform clean but low 10 vpp ?? schematic shows 120 vpp
> subbing this drive signal with Sencore TVA92 have to input minimum 40 vpp
to
> get raster anything less will blank raster
> but still no sync to picture
> What am I missing?
> Previous servicer replaced IC199 but did not fix then sent to us
> Options are correct per service manual
> adjusting H VCO will change but not lock in stable sync
>
>
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
> Dallas, TX
>
>
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