[TechAssist] Re: FIX...CTC203, no start-up
- From: "D Thunhurst" <dthunhurst@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 21 Oct 2002 18:11:32 -0600
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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