[TechAssist] Re: FIX RCA chassis MM101GCE, No power up, Low standby voltages
- From: <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 11 Sep 2003 13:05:11 -0500
DTV306/307/MM101
Power light comes on but no picture no sound
Check for shorted CR14602 and burned R14609 10 ohm 1/2watt under T14600
if burned, replace CR14602 and CR14611 #234048
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX
----- Original Message -----
From: "Jon Garver" <jongar@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, September 10, 2003 7:12 PM
Subject: [TechAssist] Re: FIX RCA chassis MM101GCE, No power up, Low standby
voltages
> The problem was a leaky diode location CR14602 #BYW100-200
> or NTE587. It supplies a negative voltage to the negative 12V
> regulator. I used a NTE588 equivalent, same specs but higher
> current rating. Sorry, I don't know the RCA part number.
>
> Thanks to everyone that replied and especially to Jason from
> Excel Dist. and Jeff of Intrepid Electronics.
>
> Jon Garver
> Heritage Television Service
> Monticello, Indiana
> 574-583-9681 Voice & FAX
> jongar@xxxxxxxxxxxxx
>
>
> ----- Original Message -----
> From: "Jon Garver" <jongar@xxxxxxxxxxxxx>
> To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> Sent: Monday, September 08, 2003 8:43 PM
> Subject: [TechAssist] RCA chassis MM101GCE, No power up, Low standby
voltages
>
>
> > Model MM36110
> >
> > Unit will not power up. It will come on with high voltage
> > for a split second when the power plug is pulled.
> >
> > I don't have the manual on this but I do have the power supply
> > schematic.
> >
> > The 33V line measures 21.5V
> > " 12V " " 4.9V
> > " 8V " " 3.4V
> > " 5V " " 1.2V
> >
> > I tried lifting individual the different supply lines to see
> > if it was being loaded down. Voltages did raise but still not
> > to where they should be. I checked just about every part in the
> > primary and secondary. I'm wondering about the SMPS transformer
> > but have never seen one bad but I know it does happen.
> >
> > This is my first on these newer MM chassis so any hints or
> > suggestions are welcomed and appreciated.
> >
> > Jon Garver
> > Heritage Television Service
> > Monticello, Indiana
> > 574-583-9681 Voice & FAX
> > jongar@xxxxxxxxxxxxx or
> > heritagetvsvc@xxxxxxxxx
> >
> >
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