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Submitted By |
Hal
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Date Posted |
11/17/2003 1:40:26 PM |
Title |
RCA F27615; CTC203AX |
Message |
Set has blowen fuse and Q4101 is blowen apart. Need part number and any other parts that need to be checked out. Thank you. |
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Submitted By |
David
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Date Posted |
11/18/2003 2:33:43 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
The sub for all these Q4101 in the 203 chassis is IRF740. You will have to replace those other 2 Transistors close to Q4101, probably 2 or more resistors in the same area. Check the Horizonal Output Transistor to be sure its not shorted and resolder L-14101 which caused the whole problem anyway. L-14101 is behind the H.O.T.::David:: |
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Submitted By |
Hal
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Date Posted |
11/18/2003 12:35:51 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Thank you, but I'm not sure that I've asked about the right transistor. The heat sink had Q4101 stamped on it, but the PCB has Q14101 silk screened on it. My eyes aren't what they used to be. Is your information still correct? |
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Submitted By |
David
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Date Posted |
11/19/2003 2:41:29 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Yes! RCA and alot of other manufactures will sometimes drop the first digit of a stated number on the schem's assuming the Techs are aware that most 4000 series numbers are in the horizonal-high voltage deflection area of the schem's.::David:: |
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Submitted By |
Hal
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Date Posted |
11/19/2003 1:28:41 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
| Thanks David, so far so good. The horizonal output trans is shorted. R14107 is open and burnt can't tell what the value is and Q14102 is marked as 4063 it doesn't cross as a 2N4063, can you please help with these values? Thank you! |
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Submitted By |
David
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Date Posted |
11/20/2003 3:50:46 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
I'll have the correct values tomorow and I posted the wrong coil number the other night. The coil that is causing all the problem is L-14401 not L-14101. Don't forget to resolder this coil wheather it looks loose or not this is very important to this repair.::David:: |
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Submitted By |
David
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Date Posted |
11/21/2003 3:06:24 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Could not get to the shop today because of river flooding here in West Virginia. The mighty Kanawha River is at its highest level since 1955. Check here tomorow as the river is now receding.::David:: |
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Submitted By |
Hal
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Date Posted |
11/21/2003 4:16:01 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
David, thanks for all your time, it is really a huge help. However I'm not sure at this point if this set is worth fixing. Yesterday I was poking around the rest of the PCB and discovered 3 other resistors that are very badly heat damaged. They are; R14509, R14119 and R14123. Any ideas? |
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Submitted By |
David
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Date Posted |
11/22/2003 4:36:47 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Lets not give up yet? I'll have the values of those parts tomorow. The other parts you ask about are as follows, R-14107=43 ohm 1/2 watt, Q-14107=2N3906 or NTE/ECG159, Q-14103=MPSA 05 or 06 either one, NTE/ECG 287, and Q-14101=STP9NB50. Also remember that all of the Q-14101 used in the 203 chassis can be subed with IRF740 devices. Take notice that any of these P6N, P9N, P12N or whatever are usually missing the first 2 letters ST this is only to confuse the novice repairman and make it hard for them to figure out what the hell they are.::David:: |
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Submitted By |
David
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Date Posted |
11/24/2003 2:22:04 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
The other resistors you ask about are as follows R-14509=200 ohm 2 watt, this resistor usually looks like its bad because it runs very hot but will be OK, R-14119=15k ohm 2 watt, and R-14123=470 ohm 1 watt.::David:: |
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Submitted By |
Hal
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Date Posted |
11/24/2003 12:54:21 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
| Thanks David, TV's are new to me as is the ST prefix, I've spent the last 16 years repairing Medical equipment and ran a guitar amp repair shop for 6 years. |
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Submitted By |
David
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Date Posted |
11/25/2003 1:52:57 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Hal I can assure you that you picked a really tough RCA chassis to learn on. I would sugest trying something else because these CTC203's are super dogs.::David:: |
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Submitted By |
Hal
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Date Posted |
11/25/2003 1:09:39 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Good morning David, as you said before "lets not give up yet" I just need one thing clarified, you listed Q14107 as a 2N3906 is this really Q14102 (4063) thats the one I needed. |
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Submitted By |
David
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Date Posted |
11/26/2003 3:22:35 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
My mistake! Yes Q-14102 is 2N3906 or NTE/ECG 159 (pnp).::David:: |
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Submitted By |
Hal
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Date Posted |
11/26/2003 12:07:28 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
| Thanks David, that should do it, I hope! |
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Submitted By |
Hal
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Date Posted |
11/26/2003 8:10:36 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Hi David, I'm having so much fun. I think I figured out that numbering system on that 4063 (NTE159). Turns out as you already know, it's either a 406-3 or a 7406-3(RCA). right??????????? TV'S, a strange breed of electronics. Thanks again!!!!!!!!!!! |
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Submitted By |
David
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Date Posted |
11/27/2003 2:34:59 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
No, RCA forever has had a habit of using a part drawing number on some of there stuff to keep everyone confused and unable to ID some of there parts. At onetime they used to have a parts drawing manual that would list the covenant 6 digit # of the OEM but these numbers didn't always cross to anything in NTE/ECG or there own SK lists.::David:: |
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Submitted By |
Hal
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Date Posted |
12/1/2003 12:23:59 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Oh well, must have just been one of thoses things. Anyway the set is working and I'd like to thank you again for all your help. Are you moving to the other board? Hope you had a good Thanksgiving and well wishes on the up coming Holidays as well. |
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Submitted By |
Randy
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Date Posted |
4/25/2004 3:51:55 PM |
Title |
RE: RCA F27615; CTC203AX |
Message |
| I have a similar TV (F31317, CTC203CA10.) The power supply is damaged just as you describe, Q14102 is blasted, Q14101 is shorted gate to drain and R's 14106 and 14104 are burned. The horizontal output transistor is shorted, but the inductor you describe, L14401, is very nicely soldered. Is there any other reason that the horizontal transistor in a relatively new TV would go bad? Thank you for your generous help to Hal, it has been a great help to me. |
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Submitted By |
David
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Date Posted |
4/26/2004 2:27:51 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
Solder L-14401 weather it looks loose or not as these dudes will fool you. Remove old solder and then resolder anew.
You could have a bad Flyback also but the only way to find out is to replace the damaged parts and hope like hell .::David:: |
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Submitted By |
David
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Date Posted |
4/26/2004 2:32:36 AM |
Title |
RE: RCA F27615; CTC203AX |
Message |
http://wa6ati.com/ This webb site has alot of good info on the 203's.::David:: |
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