[TechAssist] Samsung TXK2768C/XAA Fixed
- From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 19 Oct 2004 19:48:14 -0500
----- Original Message -----
From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
To: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
Sent: Sunday, October 17, 2004 7:24 PM
Subject: Re: [TechAssist] Samsung TXK2768C/XAA Fixed
>Second try sending this message out.
Thanks to William Rayburn and Bob Waterman for the schematics and guides
> they sent me. The final fix was the horizontal output transistor. This
> 2SD1880 checks good in and out of circuit. When you apply ac, the voltages
> to the regulator circuits are just about nil (no 12v standby or 5v to the
> micro).The voltages returned when I physically pulled the transistor out
of
> the circuit. Must have a trace going to ground from the collector, but for
> the life of me can't see anything on the transistor itself (with a
> magnifying glass), or burned marks to the heat sink. Airplay now going for
> the third day.
> Glad this one is over with.
>
> Jonas Miglinas
> Miglinas TV
> Chicago
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
> To: <miglinasj@xxxxxxxxxxx>
> Sent: Thursday, October 14, 2004 6:14 PM
> Subject: Re: [TechAssist] Samsung TXK2768C/XAA
>
>
> > Jonas,
> > Here are the troubleshooting guide, IC801 voltage table and parts list
> > (attached PDFs). I will upload the schematics to the members area as:
> >
> > TXJ2768_Schematic_Diagram.pdf
> >
> > Bob Waterman, CET® #RI-28
> > Master Technician License #9109
> > Service Manager / Parts Manager
> > Gemini Computer, TV, & Security Alarms
> > (508)695-7302
> > (508)695-7769 FAX
> > geminitv@xxxxxxxxxxx
> >
> >
> >
> > ----- Original Message -----
> > From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, October 14, 2004 2:04 PM
> > Subject: [TechAssist] Samsung TXK2768C/XAA
> >
> >
> > > Hello all,
> > > Set came in dead and I found L405 burned to a crisp. Replaced it and
> still
> > no start up. Checked all parts in line with L405, and all ok. Working in
> the
> > power supply I find that the Q801 regulator voltage is almost nil in
> > standby. Testing the regulator with my ohm meter shows the regulator
> should
> > be ok. Can't seem to find the 5v to the micro. Does anyone have a
> > schematic(power supply/micro) that they can download to the members
area.
> Or
> > possible tip of what to look for. Haven't seen too many Samsungs in my
> area
> > for two years and therefore don't keep up with the literature
> > >
> > > Your help always appreciated,
> > >
> > > Jonas Miglinas
> > > Miglinas TV
> > > Chicago
> > >
> >
>
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