Jeff, This is what I have, it's originally from you hope you gave yourself good advise...:) GL "joe" ================================== RCA P46770CK/ PTV169PA FBT I suggest you read the following post before proceeding to see if this is applicable to your situation. Please let us know if it is so we can gather this information and forward it to the appropriate personnel: We ordered a 232191 IHVT from Union Electronics. This was for a PTK169. The first one we received failed to work. Many hours troubleshooting time spent and unneeded replacement parts were installed determining something was wrong with the new flyback. (Holly at Union again verified the part number was correct.) Another was ordered again from Union. Again many hours of time was spent determining that this part was also bad. This was confirmed when a known good flyback from a working set was substituted temporarily and the set fired up and worked beautifully. A third transformer was ordered, this time from Andrews. (Willy at Andrews also verified we were ordering the correct part). The part from Andrews arrived and worked just fine. All 5 transformers, the original, the one from the working set that was used as a substitute, and all three new flybacks had the same part number on the flyback, 2G25018 and TCE 30.0KV. All three new flybacks had the part number 232191 on the boxes. During the course of checking the transformers against one another we discovered that apparently the 2 from Union were MIS-LABELED AT THE FACTORY! They appear identical on the outside with one exception: The two original FB's and the 3rd successful FB all had a green ink splotch about 1/2 to 3/4 inch in diameter on them, whereas the two that did not work had no such splotch. I don't know how significant that is. We determined that these transformers were made to be used in the direct view chassis and were MIS-LABELED AT THE FACTORY. According to the tests we performed here, it has to do with the way pin 6 is connected on the direct view VS the PTV-- In the Direct View CTC169, pin 6 is the low end of the Anode winding. In the Projection PTK169, the black wire (also present on the Direct View flyback) is the low end of the Anode winding and is connected to a circuit that looks like it monitors beam current and limits peak brightness. Symptoms of the wrong FB in the Proj set: Standby is just fine. Hit PWR: Momentary Horiz drive. 200V line only goes up to about 100 or 120V and the 26V line goes up to about 36V, as measured on a 'scope. If you short pin 4 of T4101 (Run regulator feedback) to hot ground as per the official Troubleshooting manual, R4762 (430 ohms 1W) on the HV Reg PCB (mounted on the H.O.T. heatsink) blows the magic smoke. This HV Reg PCB is not present in the Direct View set. How to test before installing the FB to make sure that you have the correct one: Using the Sencore VA48, Horiz SCR output, connect ground to pin 1 and drive to pin 11. Use your scope to adjust to 10V positive peak pulse drive. Here's the key to the test: If you measure the anode voltage using the wrong pin as ground/common, the voltage is too low. The exact voltage is very sensitive to the drive voltage, so comparison is the key. Proj FB using black wire as common on 10M DMM: 220 to 230Vdc. Proj FB using pin 6 as common on 10M DMM: 150 to 160Vdc Direct View FB using black wire as common on 10M DMM: 150 to 160Vdc Direct View FB using pin 6 as common on 10M DMM: 220 to 230Vdc I'm sure you see the pattern. :'/ A cross check of the Thomson PTK169 service manual on CD vs our paper Thomson CTC169 is inconclusive as the schematic of the PTK169 FB circuit labels the low end of the anode winding as pin 6. The PTK169 service manual lists the replacement part as 232191. ================================== [EMAIL PROTECTED] From: [EMAIL PROTECTED] (Intrepid�Video�Support) Date: Tue, Feb 24, 2004, 11:07pm To: [EMAIL PROTECTED] (Tech List) Subject: [Techs] RCA P46770CK/ PTV169PA///FBT question.// Reply�to: [EMAIL PROTECTED] (ELECTRONICS PROFESSIONALS LIST) A little over a year ago there was a discussion regarding the flyback for this projections set. I had ordered 232191 three times and none worked. I come to discover, these apparently were for direct view sets, not Projos.. The unit I had at the time, I ended up using HV putty to seal the hole. I have a service call on this unit about 15 months, I think the HV leaked through my repair. Has anyone had success with this part number lately using it on a projection unit.. I am familiar with the notes that come with this part, but that is not an issue.. I believe someone mentioned our friend in Mexico had been mislabeling these, or something to that effect...
Thank you. Jeff Dougherty Intrepid Video TV/VCR 263 S Front St Steelton PA 17113 fax...717-564-4952 www.intrepid-video.com www.tech-repair.net ______________________________________________ Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. www.intrepid-video.com www.tech-repair.net Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com Joes....Electronics �(Joe:Tech/2004) [EMAIL PROTECTED] Fax::509-479-2283 _______________________________________________ Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. www.intrepid-video.com www.tech-repair.net Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com
