[TechAssist] Re: RCA MM101 Shorted Horiz output FIXED!
- From: "Ohio Consumer Electronics" <jj@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 5 Nov 2003 16:55:43 -0500
Woohoo! Turns out the only thing wrong was the horizontal output transistor
2SC5422. The new one runs quite cool for an RCA ;)
The old one was burning up due to the failure mode - it didn't completely
short. I could measure 1K ohm emitter - collector with my meter and at
running voltage who knows... So with resistance present it just acted like
a giant toaster!
I'll add this to the database...
Joel Jacobs
Ohio Consumer Electronics
Pickerington, Ohio
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 04, 2003 3:07 PM
Subject: [TechAssist] Re: RCA MM101 Shorted Horiz output
> Have fun with it. These are some really good ones to troubleshoot. This is
> all I can find on it:
> ---------------------------------------------------------------
> Text pasted from WinSTIPS 2.0
> http://www.ServiceSoftware.com
> ---------------------------------------------------------------
>
> RCA MM101
>
> Dead / Clicks But Won'T Turn On.
>
> Gateway Electronics Inc. Frank D'Alio
>
> Replace Defective Horiz Drive Transformer Part Number 243859 Location
T14451
>
> ---------------------------------------------------------------
>
> RCA MM101
>
> Sut Down. Comes On With Hv For A Second When Power Plug Is Pulled
>
> Jon Garver
>
> Leaky Diode Location Cr14602 # Byw100-200 Or Nte587.
> It Supplies A Negative Voltage To The Negative 12v Regulator.
>
> ---------------------------------------------------------------
>
> 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@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
> www.geminicomputertvsecurityalarms.com
>
>
> ----- Original Message -----
> From: "Ohio Consumer Electronics" <jj@xxxxxxxxxx>
> To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, November 04, 2003 1:19 PM
> Subject: [TechAssist] RCA MM101 Shorted Horiz output
>
>
> > Set tries to start 3 or 4 times then gives up. The fans start to turn
> each
> > time high voltage and vertical both present each time it tries to start.
> >
> > I found a shorted horizontal output Q14451. It drives the yoke only -
not
> > the flyback. It's been running really hot - the board is browned around
> the
> > heatsink and a plastic clip thingy that clips on the heatsink has
melted.
> >
> > Does anyone know of any service bulletins or the cause of this
transistor
> > running that hot? I need to order the transistor and I'd like to know
if
> > there are other parts likely to be needed so I only need to order once.
> > This is the first of these chassis I've seen.
> >
> > Thanks much...
> >
> > Joel Jacobs
> > Ohio Consumer Electronics
> > Pickerington Ohio
> >
> >
> >
>
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