Going with a fresh post on this one. I still can't find the problem. First thing, I found the resistors and diodes for the 13 (-/+) lines bad, replaced those and shorted vertical IC. Then, I had raster that was red with retrace, found the RED video IC bad on CRT board. Also, R50 open..replaced, then back to no video. I've tried three more vertical out IC's all OEM and NTE, still no video. With the NTE in, I get some video very top of screen about 1/4 inch across. On IC271, 46/47, voltages were about a volt low and wave forms were low p-p, replaced IC..no fix. Wave forms in/out of SAW filter are OK. On pin 1 over vertical yoke, which comes from pin 5 of vertical wave form shows about 50 vpp, very high. Pin 6,7 of vertical show low pp voltage. I've went over and over my traces solder, replace the resistors and diode with OEM numbers, went over the CRT board again. If I remove the vertical plug, I do get a horizontal line and the power LED flashes. I checked the yoke and it is about 1 ohm off from one on another set. I have the schematic of this section, but am not sure what is causing these wave forms to vary. I put in another Philips IC and the wave forms are even farther off. Any other ideas before I scrap this set...I've done many of these B8 for the same problem and have never had this type of trouble, 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 ----- Original Message ----- From: "Intrepid Video Support" <[EMAIL PROTECTED]> To: "Tech List" <[EMAIL PROTECTED]> Sent: Friday, March 26, 2004 5:45 PM Subject: [Techs] TA...NAP HD2717C101 27B800, no video..(was vertical prblm) This set came in with the typical vertical problem..or so I thought.. I repaired the vertical section by replacing the two resistors, R420, R445, D409, D445 and IC500 and repaired my traces that lifted...I double checked all the traces and they are fine. Then, I had blue screen with retrace. Found voltages off on CRT board. Found R50 on CRT open, no help. Resistance across R53 was half what is should be. The other two resistors for the red and green measured correctly, pulled the resistors and measured fine out of circuit so I replaced the IC TDA6106. Now I have raster at all, no OSD, increase G2 and all I get is raster with retrace lines. I checked my -13 and +13 source, they are fine. I replaced the vertical IC again and no change. Any ideas? Thank you. Jeff Dougherty Intrepid Video TV/VCR 263 S Front St Steelton PA 17113 fax...717-564-4952 _______________________________________________ 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
