[TechAssist] Re: Another CTC187CN3 regulator and HOT running hot
- From: Jerry Wilkinson <scotvrpr@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 14 Aug 2004 07:26:33 -0700 (PDT)
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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>
>
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=====
JERRY WILKINSON
SCOTTY'S TV SERVICE
LIVONIA MICHIGAN
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