[TechAssist] Re: RCA CTC187 larger screen TVs--info

I give the nod to OEM's almost everytime.
Especially the larger sets.You pay a little more for the OEM's,but
the larger sets can absorb the price(s)

Peggs

At 12:35 AM 2/28/03 -0500, you wrote:

>I recently repaired two CTC187 32" sets. One I used an OEM RCA HOT. The
>other set I used a generic BUH517.  The OEM measured 47 deg. C on the
>heatsink directly above the transistor and the generic BUH517 measured
>48 deg. C. These measurements were both taken after 2 hours of
>operation. The generic had the exact same "look" to it as the OEM. I
>have since ordered another generic and it has a "different" look to it.
>Perhaps this one is counterfeit, I don't know but I will try it next
>time and measure the temperature. I just measured the resistance with my
>Fluke 77 meter. Using the Ohms scale, I get 1.6 meg from B to E and
>infinety the other direction. On diode test, it measures like any proper
>NPN bi-polar transistor. This transistor does not measure like it has
>internal resistors. Does this mean it is a definite counterfeit?
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>7134 Fife Rd, RR 7
>Guelph Ontario Canada N1H 6J4
>Fax: (519)821-1530
>email: gary (at) number63.ca
>
>
>
>
>
>
>
>C&W Electronics wrote:
> >
> > If you want to solve the "heat" problem, use OEM transistors. If you use a
> > generic, check the e-b resistance. It should be apx 30-50 ohm, warm the
> > transistor, if it goes over 50 ohms, it won't stay.
> > Good luck,
> > Paul W
> > C&W Electronics
> > Azle Texas
> >
> > ----- Original Message -----
> > From: "Hugh at Main TV" <maintv2002@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, February 27, 2003 1:28 PM
> > Subject: [TechAssist] RCA CTC187 larger screen TVs--info
> >
> > >
> > > This is a fix we have used on several problem CTC187 sets--problem will
> > > be--dead set, hor. output shorted original number replaced, put in new
> > > flyback (RCA), set runs but heatsink gets very hot after 1 hour or
> > > so--about 185-190 deg with digital sensor unit. Sencor horz. output
> > > checker HA325 says the circuit is OK.  If let go TV will go out
> > > again--same problem-shorted h. output transistor!  We did everything  to
> > > fix problem--nothing helped.  The fix that has worked is to install a
> > > small 60 X 60 mm computer type fan - 12v at about 125 ma-on the plastic
> > > board holder near the horz. output transistor.  This blows cool air
> > > right on the transistor and heatsink--or can set to exhaust hot air
> > > away. We use a 12V fan and connect to the +12v regulator Q4852.  We used
> > > rubber shock mounts to install the last fan for quiet operation, and
> > > drilled air holes in side of case on a 36 in TV near where the fan sits.
> > > This problem seems to be mainly on 32in and bigger sets of the CTC187
> > > line.  These fans can be found on E-BAY for as little as $1 to $2 each
> > > new.  The temp. on the heatsink after the fan is installed drops to
> > > about 75deg!  No callbacks!  Note: We found that RCA uses 3 fans in
> > > their new HD 36in TVs, maybe they know something?
> > > --
> > > Hugh Thornley
> > > Main TV
> > > 636 Main St.
> > > Longmont, Colorado 80501
> > > 303-776-6955
> > > maintv2002@xxxxxxxxxxxx
> > >
> > >
> > 
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> > >
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>
>--
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>7134 Fife Rd, RR 7
>Guelph Ontario Canada N1H 6J4
>Fax: (519)821-1530
>email: gary (at) number63.ca
>
>*****************************************************************************
>Submit A Repair Tip Here, or Change/Remove your Email Address:
>         http://www.tech-assist.org/secure/tip/main.html
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Peggs' Electronics
1519 West 2nd Street
Owensboro,KY 42301
270-926-4968
fax 270-686-7399
peggs@xxxxxxxxxxxxxx

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