Well,....I'll be damned ! I wish I hadn't thrown mine away already. Jeff,...you are a better tech then me. Congradulations. ;-(
LLW LeRoy Westlund Westlund TV & Electronics 97 North Main "Where there's a will,... Centerfield, UT 84622-0087 There's always a way." Ph./Fax 435-528-3822 mailto:[EMAIL PROTECTED] -----Original Message----- From: Doug Keller <[EMAIL PROTECTED]> To: ELECTRONICS PROFESSIONALS LIST <[EMAIL PROTECTED]> Date: Friday, April 02, 2004 11:11 AM Subject: Re: [Techs] Fixed..NAP HD2717C101 27B800, no video..(was verticalprblm) >Don't applaud,..........throw money!!! > >Doug Keller >Wis-Kel Electronics >101 Freeland Ave. >Terra Alta, WV >USA 26764 >[EMAIL PROTECTED] >[EMAIL PROTECTED] >http://www.tech-assist.org >"Learn from the mistakes of others, because you >won't live long enough to make them all yourself" > > > > > >Intrepid Video Support wrote: > >>Persistence pays off again... >>After spending a lot of time in the vertical section, I came to the conclusion my final fault was not in >>this circuit. It was confusing since removing the vertical connector for the yoke, I got a horizontal >>line.. >>In my checks of IC271, I found my voltage low on pin 18(s/b 5.1v). Lifting the pin and the voltage came >>up. >>On connector J251, I had 1K ohms resistance pin 5 to ground, unsoldered and isolated problem to CRT board >>as other techs had suggested. I thought I ruled the CRT board out as shows video on the scope on each IC >>and injected video and the screen lit up. >>Tracing the path back I found the final two video out IC's(that I did not replace in the beginning) >>actually had pins 5 shorted to ground, lifted to confirm that pins 4,5 were shorted. >>Replaced IC's and screen lit up, though decreased vertical...I put the original EEPROM back in set and >>picture was perfect. >>I appreciate everyone that sent schematics and offered their help. I couldn't have completed this task >>without the help from this list.. >>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: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> >>Sent: Wednesday, March 31, 2004 1:04 PM >>Subject: [Techs] 2nd REQ... TA...NAP HD2717C101 27B800,no video..(was vertical prblm) >> >> >>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 >> >> >>_______________________________________________ >>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 >> >> >> >> >> > >_______________________________________________ >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 > _______________________________________________ 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
