[TechAssist] Re: FIX...CTC203, no start-up

  • From: Doug Keller <dek@xxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Tue, 22 Oct 2002 05:05:43 -0400

Has to be something to do with drugs. *laughs*
Doug

D Thunhurst wrote:
> 
> That is my point exactly!!!
> This set belongs to an elderly couple.  They claim it was never worked on
> since they had it (so they say).  There was no evidence this set had been
> tampered with.  The dust in the set showed no signs of being disturbed.  If
> the set did come in with the 750 ohm resistor, then I guess there really are
> little gremlins out there that work at night while the shop is closed and
> leave no tell tale signs of doing it.  I am a one man shop so there isn't
> anyone else that could have swapped out this resistor without me knowing it.
> But of course,  being in this business could cause one to loose their mind,
> I guess.
> Daryl
> Daryl's TV
> 3310 Dyer St.
> El Paso, TX 79930
> 915-565-9184
> 915-564-1024 Fax
> http://dynacomp.freeyellow.com
> -----Original Message-----
> From: HSWAD@xxxxxxx <HSWAD@xxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Monday, October 21, 2002 5:44 PM
> Subject: [TechAssist] Re: FIX...CTC203, no start-up
> 
> >Hold it!!!! Something wrong here---If the set had the wrong resistor how
> did
> >it ever work when it was purchased new??????? Hollis Bates, field
> >engineer-retired             In a message dated 10/21/02 7:27:18 PM Eastern
> >Daylight Time, dthunhurst@xxxxxxx writes:
> >
> >
> >>
> >>
> >>
> >>
> >> Thanks to all that replied to me on this dog. The cure was r14109.  It
> >> aparently came from the factory with a 150k resistor and it should have
> >> been
> >> 750 ohm resistor.  The set did not show any signs that this resistor was
> >> tampered with by someone.
> >> I guess r14103 must have been giving some problems at assembly and the
> >> factory must have used a select resistor in that circuit to make it
> >> functional.  That is the best assumtion I can come up with.  Hard to
> belive
> >> this set worked for a couple of years like that.  Perhaps this is one
> >> reason
> >> the chassis number in the set was different that what was labled on the
> >> back.
> >> I hate DOGS like that one because you are looking for something defective
> >> rather that a wrong part.
> >> Tomorrow I say good-bye to this one and hope I don't see it again for a
> >> mighty long time.
> >> Again, thanks to everyone for the valuable help.
> >> Daryl
> >> Daryl's TV
> >> 3310 Dyer St.
> >> El Paso, TX 79930
> >> 915-565-9184
> >> 915-564-1024 Fax
> >> http://dynacomp.freeyellow.com
> >>
> >> ---------- Original Message ----------------------------------
> >> From: "miglinasj" <miglinasj@xxxxxxxxx>
> >> Reply-To: techassist@xxxxxxxxxxxxx
> >> Date:  Fri, 18 Oct 2002 18:23:08 -0500
> >>
> >> >
> >> > Hello Daryl,
> >> >
> >> > Partsfinder lists R14109  as 750 ohm on both CTC203CE1 or CTC203CX
> >> modules.
> >> >Maybe this is your problem. If it isn't, could it be possible that
> R14103
> >> >that you replaced is opening up under a load? I would change this again
> >> and
> >> >hard wire the resistor to its next connection to sure.
> >> >
> >> > Jonas
> >> > Miglinas TV
> >> >----- Original Message -----
> >> >From: "D Thunhurst" <dthunhurst@xxxxxxx>
> >> >To: "techassist" <techassist@xxxxxxxxxxxxx>
> >> >Sent: Friday, October 18, 2002 5:12 PM
> >> >Subject: [TechAssist] UPDATE-CTC203, DEAD- No start up
> >> >
> >> >
> >> >>
> >> >> Update on this CTC203 set.
> >> >> I am still having the same problem with this dog.
> >> >> There is no start-up and no secondary voltages at all from the SMPS.
> >> >> I have replaced, using OEM parts, the following:
> >> >> r14103        1 meg  (this was the first thing I found to be bad)
> >> >> As recommended, I replaced....
> >> >> q14101       244223
> >> >> q14102       147665
> >> >> q14103       232218
> >> >> u14101       223653
> >> >> u14102       231525
> >> >> The other parts recommended to check where found to be good.
> >> >> r14109 was mentioned to be 750 ohms but I found a 150k in its place
> and
> >> it
> >> >> does check good.  It doesn't appear to have been tampered with, so I
> >> think
> >> >> it is original.
> >> >> It has been also suggested to change out the "Gemstar" module.  This
> set
> >> >> doesn't have it.
> >> >> I also have disconnected the collector of the HOT to see if sound is
> >> >> returned.  No help there.  The power supply to the HOT is still zero.
> >> >> At plug-in, I get a faint chirp that diminishes in volume for about
> two
> >> >> seconds.
> >> >> I have checked with a fine tooth comb, so to speak, for the
> possibility
> >> of
> >> >a
> >> >> fine crack in the board as well as for poor connections.....None
> found.
> >> >> At the bottom of this post is the original post on this set.
> >> >> Perhaps someone has some additional ideas to try or possibly a scan of
> >> the
> >> >> power supply would be a help.
> >> >> Again, thanks,
> >> >> Daryl
> >> >> PS
> >> >> The customer's patience is wearing a bit thin as I have had this set
> for
> >> >> awhile (awaiting parts, etc.)
> >> >>
> >> >> Daryl's TV
> >> >> 3310 Dyer St.
> >> >> El Paso, TX 79930
> >> >> 915-565-9184
> >> >> 915-564-1024 Fax
> >> >> http://dynacomp.freeyellow.com
> >> >>
> >> >> -----Original Message-----
> >> >> From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
> >> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> >> >> Date: Thursday, September 26, 2002 3:08 PM
> >> >> Subject: [TechAssist] Re: CTC203, DEAD- No start up
> >> >>
> >> >>
> >> >> >
> >> >> >Don't cheat on the parts.  If transistor q14101 OR q14102 OR q14103
> OR
> >> >> >q14108 are bad replace all of them together
> >> >> >
> >> >> >r14107       244214    43ohms
> >> >> >r14109       179317    1/4w 750ohms 5%
> >> >> >r14108        244215    .1ohm 3W
> >> >> >q14101        244223
> >> >> >q14102        147665
> >> >> >q14103        232218
> >> >> >q14106        215495    smd, maybe bad
> >> >> >q14107        215495   smd, maybe bad
> >> >> >q14108        215496
> >> >> >u14101        223653
> >> >> >u14102        231525
> >> >> >
> >> >> >The failure was probably caused by u14102.  This is a precision
> >> reference
> >> >> >IC.  Although the opto-isolator is probably good for the buck it
> costs
> >> it
> >> >> >isn't worth the gamble.  Also, very carefully check all of the pins
> on
> >> >the
> >> >> >switchmode transformer, ensuring that the traces are good.
> >> >> >
> >> >> >This power supply needs about 80vac to run.  It is a frequency
> >> modulated
> >> >> >regulator.
> >> >> >
> >> >> >Wayne Vanaman
> >> >> >Omega Electronics
> >> >> >6904 W Fairfield Dr
> >> >> >Pensacola, Fl.  32506-3310
> >> >> >
> >> >> >850-456-5995 voice
> >> >> >850-458-6369 fax
> >> >> >
> >> >> >Mailto:Wayne@xxxxxxxxxxxxxxxxxxxxx
> >> >> >WWW.PensacolaTVRepair.Com
> >> >> >
> >> >> >
> >> >> >----- Original Message -----
> >> >> >From: "D Thunhurst" <dthunhurst@xxxxxxx>
> >> >> >To: "techassist" <techassist@xxxxxxxxxxxxx>
> >> >> >Sent: Thursday, September 26, 2002 2:50 PM
> >> >> >Subject: [TechAssist] CTC203, DEAD- No start up
> >> >> >
> >> >> >
> >> >> >>
> >> >> >> Hi,
> >> >> >> I have a 36" RCA, F36665, chassis CTC203CE1 marked on the board and
> >> >> >CTC203CX
> >> >> >> marked on the back.
> >> >> >> I am quite sure it is a start up problem as there are no secondary
> >> >> >voltages
> >> >> >> at all.  I do have 165 volts raw B+ to the drain of Q14101.  I
> >> >originally
> >> >> >> could start the set by placing my meter on the gate of Q14101 and I
> >> >would
> >> >> >> get a small chirp of the power supply starting up.  I then could
> turn
> >> >the
> >> >> >> set on and everything worked until turned off.  I checked
> everything
> >> in
> >> >> >the
> >> >> >> gate circuit of Q14101 and found R14103 (1 meg) wide open.  I
> >> replaced
> >> >> the
> >> >> >> resistor and now I can not get it to turn on at all.  At plug in, I
> >> get
> >> >a
> >> >> >> faint diminishing chirp out of the power supply with 2.6 volts on
> the
> >> >> >gate,
> >> >> >> 165 on the drain, and 0 on the source.  Naturally I am not getting
> my
> >> >140
> >> >> >> volts or 5 volts, etc.  I re-checked the components in the chopper
> >> >> circuit
> >> >> >> and found nothing else bad.
> >> >> >> Any ideas?
> >> >> >> Thanks,
> >> >> >> Daryl
> >> >> >> Daryl's TV
> >> >> >> 3310 Dyer St.
> >> >> >> El Paso, TX 79930
> >> >> >> 915-565-9184
> >> >> >> 915-564-1024 Fax
> >> >> >> http://dynacomp.freeyellow.com
> >>
> >>
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-- 
Doug Keller          "Learn from the mistakes of others,
Wis-Kel Electronics   because you won't live long enough
101 Freeland Ave.     to make them all yourself"
Terra Alta, WV
USA        26764
dek@xxxxxxxxxx
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