[TechAssist] Re: UPDATE-CTC203, DEAD- No start up
- From: "miglinasj" <miglinasj@xxxxxxxxx>
- 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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