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Dead Ctc203

R

russellsh

Jan 1, 1970
0
I Have An Rca Ctc203 Tv That Is Dead. According To The Owner The T
Would Intermitently Shut Off, And If You Hit The Side It Would Com
Back On. Then It Just Stopped Working All Together. When You Plug I
In The Smps Chirps And When You Turn It On It Tries To Turn On Thre
Times But Never Does. From What I Have Found On The Net I Believe I
Is The Flyback. Could Anyone Tell Me If I Am Right And How I Can Tes
It. What Normal Readings Would Be And What I Can Expect. Unfortunatl
I Don't Have An O-scope. Infact I Really Only Have A Multimeter.

Thanks
Stev
 
J

John-Del

Jan 1, 1970
0
Any professional MUST have a scope and know how to use it. Scoping the
collector waveform during the start attempt will tell you immediately
if the fly is bad (or a load on the secondary). A DVM isn't going to
much help on this.

John
 
D

Dani

Jan 1, 1970
0
I do a lot of CTC 203, & if it's blown up, the flyback is bad only some
of the time, but
for the cheap price, might as well change it. If it was working when
you tapped it, it
MAY have been only a loose conection. Make sure to repair @ the
horizontal drive
coil...very common. Di the set go tottally dead, or did the sound stay,
& the screen just go black? If so...do the horizontal drive repair, &
all will be fine. Dani.
 
R

russellsh

Jan 1, 1970
0
Dani

i am not sure if the sound was there with no picture or not. the owne
is my brother-in-law and according to him it worked intermitently for
while. he said that the whole tv would shut off but he wasn't sure i
the sound went too. this is where it gets screwed up. he took the t
apart and was messing with it and in the proccess blew the fuse. whe
i got it i started with changing the fuse and as i expected it didn'
fix the problem. also there were 2 leads stick up with nothin
attached to them. i have since determined that they are the legs of
thermister that is no longer present. i believe my brother-in-la
caused this. also apon further inspection i found a burned spot on th
bottom of the bread in the same area. it looked as if something shorte
across 3 of the pads on the bottom. the pads have curled up a littl
but the connectivity of both the pads and the components attached t
them seem to be fine. however i have removed them to check if th
shorting of the pads had an affect on the components. all of this an
yet i don't believe this is what has caused the tv to intermitentl
shut off. i believe as you have stated that it was a loose connectio
however i can find no evidence of such. also as i stated before i d
not own an o-scope as of yet, and i do not know how to check th
flyback (if at all possible) with a multimeter. any advice would b
great. thanks for the help.

steve
 
D

Dani

Jan 1, 1970
0
The loose thermistor (very common in RCA) MAY have caused the fuse to
blow, but the bad connection at the horizontal drive coil, this causes
no pix, but sound stays, & it WILL
kill the set, fuse ok, horiz output shorted, & sometimes blows up the
PWM power supply.
Since he fooled with it, it MAY be a very hard job to get it working
reliably now! Send me a
pix of the top & bottom of the board, if you can. I'll try to help you
out. Dani.
 
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