[TechAssist] Re: Another CTC187CN3 regulator and HOT running hot
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 14 Aug 2004 11:13:04 -0400
I have a tip that says change C4303, but after that you seem to have gotten
them all.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Jerry Wilkinson" <scotvrpr@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, August 14, 2004 10:26 AM
Subject: [TechAssist] Re: Another CTC187CN3 regulator and HOT running hot
> i have had several sets that the horiz out ran hot
> use a d1887 its a 10 amp the 1886 is a 8 amp.. i went
> the same route as you did some transisters lasted 10
> hours some 10 seconds but the d1887 cured it and thats
> all i use now good luck, scotty
>
> --- al m <ampm@xxxxxxx> wrote:
>
> > Gary I have something marked on my print but I'm not
> > at the shop now. I
> > think it had something to do with the -15 volt
> > filter. I'll check it out and
> > get back to you.
> > Al Marquardt
> > ampm@xxxxxxx
> > Al Marquardt Electronic Repair
> > 206 W Main
> > Girardville Pa. 17935
> > ----- Original Message -----
> > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Saturday, August 14, 2004 3:03 AM
> > Subject: [TechAssist] Another CTC187CN3 regulator
> > and HOT running hot
> >
> >
> > > I have a 31" GE TV with chassis CTC187CN3. Set
> > came in with regulator,
> > > HOT, CR4106 and fuse all bad.
> > >
> > > I used a generic STK730-150 (same as # on
> > original) and an OEM 223942
> > > (BUH517) for the HOT. For the CR4106, I used a
> > generic MR856, which has
> > > faster switching time than the original PFR856.
> > >
> > > Fired set up and it ran but after an hour the HOT
> > heatsink was at 60
> > > deg. C and the reg. heatsink was at 70 deg. C. B+
> > on cathode of CR4106
> > > is 146V with set off and 139.2V with set on.
> > >
> > > Since then, I have changed the following parts,
> > all OEM unless otherwise
> > > noted:
> > >
> > > - 215541 hor driver transformer
> > > - 188594 cap, C4306
> > > - 175374 22 ohm resistor , R4402
> > > - 214753 cap, C4403
> > > - 206008 cap, C4402
> > > - 242907 CR4402 damper
> > > - 176296 CR4303 diode
> > > - 218492 cap, C4407
> > > - CR4403 - used MR856 as sub to PFR856 164589
> > > - C4105 cap 10 uF 200V generic
> > > - C4709 47uF 35V generic
> > > - R4126 30K 3W resistor generic
> > > - CR4109 7.5V 1W zener diode generic
> > >
> > > also checked C4107 for ESR and value, checked ok.
> > Tried a 2SD1886 for
> > > the HOT as well as a second OEM 223942 BUH517,
> > from the same lot as
> > > first one. No temp differences except the 2SD1886
> > ran hotter if anything.
> > >
> > > With all these parts changed, I see very little
> > improvement if any in
> > > the heat situation. The picture looks absolutely
> > fine, no bowing,
> > > shrinkage, or anything.
> > >
> > > I added extra heatsinks to the REG. and HOT. This
> > has brought the REG
> > > temp down to 60 deg. C and the HOT temp down to 40
> > deg. C. I'd still
> > > like to know what can be causing these temperature
> > problems. I'm sure
> > > I've had CTC187's in here that ran much cooler
> > than this. A few months
> > > ago I had another one running hot. Had same
> > problems trying to cool it
> > > down so I installed heatsinks. Brought the temp
> > down just like this set
> > > and I've never heard back from the customer.
> > >
> > > Any ideas to suggest? an OEM STK730-150 is way too
> > expensive but is that
> > > the answer? I asked other members who buy from my
> > supplier (Global) if
> > > they used those generic STK's and they all said
> > "all the time, no
> > > problem" What about the HOT heat? Flyback? Maybe
> > but that other set I
> > > had, I did replace the flyback and it still had
> > the same problem as this
> > > set.
> > >
> > > Thanks for any help. Sorry the message so long.
> > >
> > >
> > >
> > >
> > >
> > >
> > > Gary McCartney
> > >
> > > McCartney Electronics
> > > Guelph Ontario Canada
> > > Est. 1984
> > > email: gary (at) number63.ca
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
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>
> =====
> JERRY WILKINSON
> SCOTTY'S TV SERVICE
> LIVONIA MICHIGAN
>
>
>
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