[TechAssist] Re: RCA 27" TV F27442 Chassis CTC203AD Dead FET part# 244223
- From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 17 Feb 2003 14:28:49 -0500
Its possible its the IHVT is bad , but continuous surges through the power
supply and horz circuit because of bad solder on L14401 will knock out
power supply components. It happens 50% or more of the units I have worked
on.
Phillip R Hull STET
phil245@xxxxxxxxxxxxx
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 17, 2003 1:59 PM
Subject: [TechAssist] Re: RCA 27" TV F27442 Chassis CTC203AD Dead FET part#
244223
>
> Well, I don't believe the HOT took out the power supply, I believe the
> IHVT is the problem. I think it arced and thru high voltage on the line.
> I have seen a lot of these units with shorted HOTs and the power supply is
> fine. This is actually a pretty good power supply.
>
> As far as the "other" parts, do you have the schematic? These three
> transistors, Q2, 3, and 8 are less than 43 ohms from the FET. If the FET
is
> shorted drain to gate that puts 150+ volts on these low voltage parts. I
> couple of years ago I quit gambling on which ones were ok, they are cheap
> enough that it isn't worth my time.
>
> I left out the source resistor for the FET, R14108 a .1 ohm 3w resistor,
pn.
> 244215.
>
> Let me know if you need anything else.
> I find it very curious that Tritronics doesn't have the FET in stock.
Union
> has some, 800-648-6657. Good service from them.
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl. 32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> ----- Original Message -----
> From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, February 17, 2003 12:39 PM
> Subject: [TechAssist] Re: RCA 27" TV F27442 Chassis CTC203AD Dead FET
part#
> 244223
>
>
> >
> > Thanks for the tips Robert & Wayne.
> >
> > Are there losts of problems with the power supplies on these? Why
replace
> > the related parts when the FET was apparently taken out by the HOT. The
> > current puuled through it by the shorted output would not affect the
other
> > transistors and the ref IC, would it?
> >
> > Leonard G. Caillouet
> > Service Manager
> > Electronics World
> > Gainesville, FL
> > 352-332-5608
> > 352-332-5668 (fax)
> >
> > ----- Original Message -----
> > From: <tvservice@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, February 17, 2003 12:35 PM
> > Subject: [TechAssist] Re: RCA 27" TV F27442 Chassis CTC203AD Dead FET
> part#
> > 244223
> >
> >
> > >
> > > Your HOT caused power supply failure
> > > most likely bad solder at L14401 base of HOT caused HOT failure
> > > clean and resolder L14401 replace FET and 2 other transistors and ref
ic
> > in
> > > power supply probably open or burned resistor usually 100 ohm off
FET
> > > if need location/part numbers let me know
> > > Robert
> > > tvservice@xxxxxxxxxxxxx
> > > H & H Electronics Inc
> > >
> > > ----- Original Message -----
> > > From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, February 17, 2003 10:43 AM
> > > Subject: [TechAssist] RCA 27" TV F27442 Chassis CTC203AD Dead FET
part#
> > > 244223
> > >
> > >
> > > >
> > > > This one has a shorted HOT ( Q14401 2SD2578 ) and shorted FET (
Q14101
> > > > P9NB50 ) in the PS. The related parts check OK and the FBT tests
> good.
> > > >
> > > > I'd just like to know if there are any things to look for in these
> sets.
> > > We
> > > > haven't seen many of the CTC203 chassis yet and the FET is not in
> stock
> > at
> > > > either VB or Tritronics so we'll be waiting at least a few days for
> > parts.
> > > > Don't want any surprises nor to extend the delay on repair.
> > > >
> > > > Anyone know of a supplier that has them in stock?
> > > >
> > > > Thanks,
> > > >
> > > > Leonard G. Caillouet
> > > > Service Manager
> > > > Electronics World
> > > > Gainesville, FL
> > > > 352-332-5608
> > > > 352-332-5668 (fax)
> > > >
> > > >
> > > >
> > >
> >
>
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