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Re: No Power RCA chassis CTC187CL
Find Capacitor C4127, this is a startup cap and will fail. Then check C4709, C4105[this one almost always goes bad] and C4404. These are good starting points. You will have to resolder the Tuner as it will coorupt your eeprom and can create a dead set. And inspect the pins a Regulater T4101 I beleive, for busted grounds. If this will not start the set you will need a new eeprom or the T4101 Regulator. The regulatore rarely goes bad in this TV!
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The chassis series used in that set was notorious for bad solder connections around its tuner and a few other places. (They used the tuner shield to provide a number of ground connections, and these cracked and went flaky.) These connections would cause a variety of problems including a set that won't turn on.
The fuse is located right near the AC mains cord connections on the board. You will probably find it's good. Not much went wrong on this chassis to blow that fuse unless it was power line troubles or shorted parts on the power supply primary side.
Check for 5 volts at one of the 3 pins on the the remote sensor. If the power is there, you probably have a bad EEPROM IC. Operating parameters and TV settings are stored in that chip, and the bad solder connections I mentioned above can lead to the data getting scrambled and a "dead" set. To repair this, you need to resolder the connections at the tuner shield and a few other locations, then replace the EEPROM.
If you Google "RCA tuner solder problems" or something similar, you should find all kinds of information about where to solder. The replacement EEPROMs are available from MCM (www.mcminone.com) and you order the appropriate IC for the chassis. I'm not home now, but when I get home later I'll check my files for the service bulletin RCA released, and look up the EEPROM you need in case that turns out to be the trouble.
The HOT Hortz output transistor has gone home, 99% of the time from a faulty IVHT (Flyback Transformer), very common on the ctc187cl* chassis. The factory Flyback is no longer available, I have had problems finding an aftermarket one to replace it with.
The HOT is a BUH517, but you can also use a 2SD5129. It is the transistor mounted on the siler heat sink with a metal clip rather than a screw, just in front of the flyback.....
If you replace just the HOT, most of the time you will get a rapid arc (27,000volts - BE CAREFUL!!!) from the lower (yoke) post on the flyback. If the flyback is shorted, It may also just burn out the HOT and go right back to "squealing"....
I'm not sure about the chassis number of your tv set..
but I can give a solution for your proble....
It might be the problem at A,B,M board there's no +5V or over voltage +5V...check the IC504 at A board looks like a ic regulator 5V..check c530(470uF/25V),check c540(1000uF/16V)..
There is a common problem in this unit with R14103 (33k 2watt ) resistor that opens. When open SMPS will not load so no other voltages beyond the 5v source to click the relay.
Another possibility is the Horz. drive transformer, RCA p/n# 243859 board location T14451.
Either of these possibilities are inexpensive fixes reletively speaking, so I would advise having it estimated by a qualified shop for repair..
Check for 5 volts present at pins of EEPROM IC. ( 8 pin-center
front) = no 5 volts = Re-check power supply components such as AC in resistor 2.7 Ohm ?....Or 5 volts ok,then suspect EEPROM corrupted........part # 223957 ( install 8-pin socket,then re-plug in original, if that doesn't clear it, plug in
new part) Use pre-programmed after-market replacement,if you
can get it.....Let me know....T.
The F25261TX3 is a 25 inch set that uses the CTC185 series chassis. The 2 most common causes for the set not turning on are a corrupt EPROM and a bad regulator or resistor in the main power supply. This is also the chassis notorious for cracks on the shields around the tuner and microprocessor which causses the EPROM to go corrupt. These are relatively easy and simple things to correct, but the set should be serviced and modified by a qualified tech familiar with that RCA chassis.
You will have to order this through an authoized RCA dealer Its not old enough yet for general publications from RCA If you call Sherl at TEEVEE Supply at 1-866-207-9824 or email@example.com give them the CHASSIS number NOT the model and they will order you one. You should know my freind when dealing with RCA alsway go by a chassis number! Good Luck