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New member Username: WeehaPost Number: 1 Registered: May-09 | THIS IS THE FIX!!! This is a continuation of the following archive: https://www.ecoustics.com/electronics/forum/home-video/16787.html RCA TV Mine: Model# F36645 Chassis #:CTC203CX THE PROBLEM: Sound going to static. Unplug and plug in TV and sound comes back... Minutes to days elapse and then sound goes to static again. Background: If these links still work go here and read up on it: http://www.iwaynet.net/~nesda/SilentCTC.html https://www.ecoustics.com/electronics/forum/home-video/16787.html What Chassis are affected? RCA: CTC203, CTC197, and CTC195 RCA's not alone in this. Sony's Hitachi's and Philips are also affected. Sony's dropout video when it occurs. Philips have the tint shift all the way to green. Solution Source: THANKS TO JAMISON!!!!! The problem occuring in the CTC 195,197,203 Chassis is in fact caused by the broadcasting companies. A non standard signal originating in a particular '' XDS box " in the transmition chain (XDS means extra digital services) and includes closed captioning,auto clock set,program guides,VIR color levels ect, all broadcast in the vertical interval) the signal originating in this XBR box made by the "XYZ" company (names deleted) has 2 extra bits. It causes a buffer overflow in the micro and mutes the sound. This XBR box does not truncate the data stream and the extra bits get broadcast there. This problem can be corrected. Jamison Stone PORTAGE ELECTRONICS THE FIX!!!! This fix is exactly what I did on my TV: Model# F36645 and Chassis #:CTC203 Other Models and Chassis will vary but the fix should be VERY VERY close to the following: 1. Disconnect Power (DUH) 2. Let TV sit for 1 hour to discharge caps. 3. Open TV Chassis. 4. Sit at the BACK of the TV facing the BACK of the picture tube. i.e. The picture screen will face away from you. 5. Locate the main circuit board beneath the picture tube that makes up the "floor" of the TV. (It's kinda obvious) 6. Toward the front of the TV on the left hand side of the circuit board locate a black colored Integrated Circuit (IC) with two rows of pins coming out of it.(About two rows of 40 pins or so) It looks like this: http://www.tme.eu/katalog_pics/4/3/9/439fa9c4c5c7a40dc200fcdacf8aef87/at80c31x2- 3csum.jpg 7. To the left of this IC locate two round electrolytic capacitors. (They look like little cans)One is slightly larger than the other on my TV. The smaller capacitor is marked C13105 on my TV and the larger one is marked C13144. 8. The offending part is the smaller capacitor: C13105. This capacitor has two leads going into the circuit board underneath it. 9. Using a set of wire cutters you can either snip the entire capacitor out (Without shorting the leads) or if you want to keep the part in the TV just cut one lead and twist the capicator so that the cut lead will no longer touch. 10. All done... Close up the set, plug it in and presto no more sound problems. |
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New member Username: WeehaPost Number: 2 Registered: May-09 | PS: I forgot to mention after this fix CLOSED CAPTIONING will no longer work. But if you are deaf you need no sound and if you need sound you don't need closed captioning. |
