RCA ColorTrak 2000 (CTC 158B) won't power on.

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #41
    Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

    0.05 ohms is basically shorted, do you mean 0.05 kohms or something similar?
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #42
      Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

      The Gate and the Cathode of the SCR will show real low Ohm due to low resistance of the Gate drive transformer winding.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • Mrx3750
        Badcaps Veteran
        • Jul 2013
        • 311
        • USA

        #43
        Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

        Originally posted by tom66
        0.05 ohms is basically shorted, do you mean 0.05 kohms or something similar?
        Nope. 0.05 ohms, varies from pin to pin but readings go from 0.03 to 0.05 to 0.07 ohms.

        I guess if I have to I can get it out of there and test out of circuit, but those clips are a pain, to put it mildly.

        Okay pulled the SCR out of circuit. Getting 70 ohms from left to right pin. Right to middle pin, also 70 ohms. Left to middle pin, 0.05 ohms.
        Last edited by Mrx3750; 07-25-2013, 05:49 PM.

        Comment

        • RON_CET
          Badcaps Veteran
          • Jun 2012
          • 217
          • USA

          #44
          Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

          from your posted reading on SCR4101 it's bad RCA replacement part# 194320 when replacing don't forget to reinstall the small insulator back to the heat sink before installing SCR
          Ron Driver,BSEE,CET,ISCET,NESDA

          Comment

          • Mrx3750
            Badcaps Veteran
            • Jul 2013
            • 311
            • USA

            #45
            Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

            Oh boy. if SCR 4101 is bad then this is gonna have to wait until I can get some money. The resistor isn't a huge hassle. Getting the SCR might be.

            Yeah a quick Google search for the part number and I'm not really seeing it. (Man I wish I still had that XL-100 chassis)

            Comment

            • RON_CET
              Badcaps Veteran
              • Jun 2012
              • 217
              • USA

              #46
              Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

              here's the data sheet,also this can sub over to a NTE5424 also a GE part# EP15X217
              will work I do have some NOS (new old stock) EP15X217 I'll be glad to send you one just PM me your address
              Attached Files
              Ron Driver,BSEE,CET,ISCET,NESDA

              Comment

              • Mrx3750
                Badcaps Veteran
                • Jul 2013
                • 311
                • USA

                #47
                Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                Hey i was just about to post the NTE 5424 here.

                However reading a post, the NTE 5424 subs for a 780-7 SCR I have a 780-9 SCR.

                Does that matter?

                Comment

                • RON_CET
                  Badcaps Veteran
                  • Jun 2012
                  • 217
                  • USA

                  #48
                  Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                  go here put in your info in search box http://nte01.nteinc.com/nte%5CNTExRefSemiProd.nsf/$all/4DCD3806DD157815852579100081094D?OpenDocument


                  try this http://www.nteinc.com/
                  Last edited by RON_CET; 07-26-2013, 09:29 AM.
                  Ron Driver,BSEE,CET,ISCET,NESDA

                  Comment

                  • Mrx3750
                    Badcaps Veteran
                    • Jul 2013
                    • 311
                    • USA

                    #49
                    Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                    Hm seems their server is having search troubles.

                    In any case I guess I gotta put this on hold for now. Thanks for the help. I plan to return to this once I get the parts.


                    What would happen if I replaced the resister and tried to run it with the "shorted" SCR? I was getting readings of 70 ohms on two of the 3 pins.
                    Last edited by Mrx3750; 07-26-2013, 10:05 AM.

                    Comment

                    • RON_CET
                      Badcaps Veteran
                      • Jun 2012
                      • 217
                      • USA

                      #50
                      Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                      it would open R4001 resistor again
                      Ron Driver,BSEE,CET,ISCET,NESDA

                      Comment

                      • Mrx3750
                        Badcaps Veteran
                        • Jul 2013
                        • 311
                        • USA

                        #51
                        Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                        Okay, I caught a lucky break and managed to get to the electronics store. I got a 25 watt 2.7 ohm resistor, and an NTE 5424 SCR.

                        I have a few concerns before I put these in and try it out. The heat transfer pad on the SCR heatsink is intact. Can I reuse it?

                        The resistor is 25 watts instead of 15 watts, should the SCR fail again, will the higher resistor wattage cause problems?

                        Finally I removed the HOT for testing, and I saw that it has no heat dope. Should I put some on it before putting it back in?

                        Comment

                        • RON_CET
                          Badcaps Veteran
                          • Jun 2012
                          • 217
                          • USA

                          #52
                          Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                          If the insulator which mounts behind the SCR transistor isn't damaged ,then yes you can reuse,but as a rule thumb if my new transistor has one supplied with it I always replace with new one.The increase wattage on your replacement resistor will be ok,yes you can apply some heat sink compound to the Horz output want hurt
                          Ron Driver,BSEE,CET,ISCET,NESDA

                          Comment

                          • Mrx3750
                            Badcaps Veteran
                            • Jul 2013
                            • 311
                            • USA

                            #53
                            Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                            See attached photo.

                            That's a kludge if I've ever seen one.

                            But does it work?

                            Mmmm, no. Won't power up, and I smelled something funny. That resistor got pretty hot, and it was maybe plugged in for 30 seconds. Oddly when I flipped the switch on the power strip that the TV is plugged into, a lamp that's also on that circuit dimmed for a second. I think this means I have a major short somewhere.

                            Yep, the fuse is blown now.

                            I don't know if it's worth pursuing this further. I think I have a fire hazard on my hands.
                            Attached Files

                            Comment

                            • kc8adu
                              Super Moderator
                              • Nov 2003
                              • 8832
                              • U.S.A!

                              #54
                              Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                              busted solder joints on the h-drive transformer are common.
                              anything that runs hot or mounted to a heatsink should also be resoldered.
                              put your meter in diode test and check e-c on the board where you removed the hot.
                              you might read the damper one way but should be open except for charging a cap.
                              e-b will be low.if not look at the h-drive secondary and solder joints.
                              good sets for the most part and no pesky tuner on board.
                              i should not complain as those things were my bread and butter for many years!

                              Comment

                              • kc8adu
                                Super Moderator
                                • Nov 2003
                                • 8832
                                • U.S.A!

                                #55
                                Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                i have also seen h yoke return cap short and cause this too.

                                Comment

                                • Mrx3750
                                  Badcaps Veteran
                                  • Jul 2013
                                  • 311
                                  • USA

                                  #56
                                  Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                  Where's the H yoke return cap?

                                  Comment

                                  • RON_CET
                                    Badcaps Veteran
                                    • Jun 2012
                                    • 217
                                    • USA

                                    #57
                                    Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                    does your meter have diode function? If so with set unplugged what is your reading @ horz output in set? reading should be to HOT gnd . neg probe HOT gnd, pos case of transistor reading, then reverse leads for second reading.
                                    Ron Driver,BSEE,CET,ISCET,NESDA

                                    Comment

                                    • RON_CET
                                      Badcaps Veteran
                                      • Jun 2012
                                      • 217
                                      • USA

                                      #58
                                      Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                      also during your previous removal of the Horz ouput did you make sure you put the transistor insulator back onto the transistor before mount back to heat sink?
                                      Ron Driver,BSEE,CET,ISCET,NESDA

                                      Comment

                                      • Mrx3750
                                        Badcaps Veteran
                                        • Jul 2013
                                        • 311
                                        • USA

                                        #59
                                        Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                        What transistor insulator? Oh that plastic on the back of it? Yeah that's fine. Doesn't matter I would think because the HOT is attached to the heatsink with a metal clip.

                                        So you want me to set my meter to diode function, clip the negative lead to the HOT heatsink, and the positive to the casing of the HOT? Well, doesn't make sense, but did that and got no reading either way.
                                        Last edited by Mrx3750; 07-27-2013, 03:56 PM.

                                        Comment

                                        • RON_CET
                                          Badcaps Veteran
                                          • Jun 2012
                                          • 217
                                          • USA

                                          #60
                                          Re: RCA ColorTrak 2000 (CTC 158B) won't power on.

                                          I don't have the schematic in front me it's on my desk @ work but you should get a reading in 1 direction E-C which Emitter is HOT gnd and no reading the reverse direction i'll review the schematic Monday and post again
                                          What i'm looking for is potential low resistance or short on the 150 volt raw B+ which would take out the 2.7 ohm resistor and open the fuse
                                          Last edited by RON_CET; 07-27-2013, 05:33 PM.
                                          Ron Driver,BSEE,CET,ISCET,NESDA

                                          Comment

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