[TechAssist] Re: [Fwd: RCA 31" CTC187CN2 HOT shorted, replaced with RCA OEM, runs warm]

  • From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 12 Jan 2002 08:37:02 -0600

Dennis and all:

My Fluke IR meter is very directional.  It will measure different
temperatures in the ends of an IC.  At 1 inch its reading diameter is .3
inches, at 3 inches, .8 inches.  I can see differences from one side of the
STK730-x devices.

In the case of the particular unit I was measureing (it was in for an
intermittant shutdown problem, which was, of course, tuner wrap) and just
happened to be available at the time of someone elses post, the IC has the
factory thermal pad.  This morning the room is 75F.  Reading the back of the
stk/heat-sink from about 2 inches, the center of the device measures 151.
This particular unit has the single screw clamp, and the screw reads 145.6F.

Well, gotta go play somewhere else now.

Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Penacola, Fl.  32506-3310

850-456-5995 voice
850-458-6369 fax

Mailto:Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com


----- Original Message -----
From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, January 11, 2002 11:02 PM
Subject: [TechAssist] Re: [Fwd: RCA 31" CTC187CN2 HOT shorted, replaced with
RCA OEM, runs warm]


>
> How about the heat sink? Is it also running at 152 degrees. If not, it
should be
> running close. Is the heat sink compound fresh?
>
> Dennis Viereck
>
> Wayne Vanaman wrote:
>
> > Phil:
> >
> > I have a 187 on the bench, been running for about 2 hours in a 78 degree
> > room.  The STK measures 152F with my IR thermometer, and yes, too hot to
> > touch for very long.  The things DO run hot.
> > Oh, the HOT measured 148F.
> >
> > Wayne Vanaman
> > Omega Electronics
> > 6904 W Fairfield Dr
> > Penacola, Fl.  32506-3310
> >
> > 850-456-5995 voice
> > 850-458-6369 fax
> >
> > Mailto:Wayne@xxxxxxxxxxxxxxxxxxxxx
> > WWW.PensacolaTVRepair.Com
> >
> > ----- Original Message -----
> > From: "Phil Bader" <philbad@xxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, January 11, 2002 1:07 PM
> > Subject: [TechAssist] [Fwd: RCA 31" CTC187CN2 HOT shorted, replaced with
RCA
> > OEM, runs warm]
> >
> > >
> > >
> > >
> > > -------- Original Message --------
> > > Subject: RCA 31" CTC187CN2 HOT shorted, replaced with RCA OEM, runs
warm
> > > Date: Fri, 11 Jan 2002 14:05:18 -0500
> > > From: Phil Bader <philbad@xxxxxxxxxx>
> > > Organization: Jan Phyl TV Inc. Winter Haven, Fl.  Estab. 1976
> > > To: "CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx"
> > > <CONSUMERELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
> > >
> > > Came in with the usual whine when plugged in.Shorted HOT. I used an
> > > RCA/OEM ver. of the BUH517 # 223942. I also changed the STK730-150,
> > > figured it was stressed. It seems to me after 30 minutes running, the
> > > HOT sink is uncomfortably warm to touch(can't keep finger on it for
> > > longer than 3 sec.), tho picture,etc is perfect. I have a "kit" I put
> > > together containing Q4401 HOT,C4402,CR4402,R4402,CR4403,C4407 as well
as
> > > the STK730. At this point only the HOT and STK are replaced (The STK
was
> > > probably OK). Should I install the rest, or am I missing another part
> > > causing this warm symptom.Maybe this is normal. Suggestions...
> > > ------------------------------------------
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> >
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