DEAD RCA TV CTC168/169

[ljm2276]

My TV will not not come on, fuse is OK, I have no print, need some ideas
where to look, 32 years electronic experience, but not with TV, help
please
Thanks

 

[kip]

Well give us the correct CTC number and Model Number
and what diagnostics you have done so far...

kip

 

[ljm2276]

The Model is F31700GG, chasis is marked CTC 168/169 All I have done so far
is check the line fuse
Thanks

 

[kip]

Ok Get out the DMM and start doing some checking ...
Whats the standby Voltage on the HOT (Middle Pin) whilst plugged in BUT NOT
turned on ?
Whets the voltage on the start diode CR4118 ?
You have to do some checking so we can be of help...
Failing That ..Call a TV shop..

kip

 

[ljm2276]

Sorry Kip the chassis number is
CTC169JS6
Thanks

 

[ljm2276]

The voltage at the diode was 60 volts DC measured form the heat sink as
ground, I am not sure where the center pin stand by voltage is measured
from. Thanks for taking your time to help me.

 

[kip]

Use the tuner as ground for both the Cr4118 and HOT measurements..
Whilst plugged in BUT NOT switched on.

kip

 

[ljm2276]

I can't find cr4118, it is cr118 on this unit I think. Voltage there is 0
also at tp4103 which is marked standby 15V it is also 0. I also noticed on
the circuit board at SG1 and SG2 you can see where it has arced over at
one time.
Thanks

 

[Art]

Should at least have B+ standby at the collector of the H-output as well as
the cathode of D4118. Yes, on the pcb it may be marked as only D118!. No
standby then you should start by troubleshooting the regulator and chopper
circuitry. Common problems are defective electrolytic caps, blown chopper,
etc.

 

[ljm2276]

Thanks Art, I pulled one cap off because it was showing shorted on the
board, but was ok when I removed it. What are chopper, (resisrors)? Thanks

 

[sofie]

ljm2276s:
Absolutely no offense intended, but I am thinking that you are a little over
your head here ... either have a tech friend with a little more recent
repair experience and electronics knowledge help you or take it to a service
shop for, at the very least, a repair cost estimate so you can make an
intelligent repair decision with facts instead of Internet guesses.
For lots of repair information you might want to visit the website for this
newsgroup at
http://www.repairfaq.org/
there with some searching you will find a wealth of repair information.