Thanks Jim... In my post...I stated I used NAP OEM for the resistors and diodes. I have my voltages at the vertical out. 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: "Jim Myers" <jr.myers@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Wednesday, March 31, 2004 2:06 PM Subject: [TechAssist] Re: 2nd REQ TA...NAP HD2717C101 27B800, no video..(was vertical prblm) Have you seen this tip: Symptom: Dim raster with faint colored bars from top to bottom. No response to changes of video, no menu or graphics on the screen. Cause: The beams in the CRT are deflected into the CRT neck and scatter at random across the screen. This is caused by either a loss of Minus 13.5 volts to IC500 (vertical out) or IC500 itself. Cure: Check and replace as needed; R420, D409, C419, IC500. Or this one: SYMPTOM: Open R420 or R445 with no apparent reason. These resistors act as fuses in the plus and minus 13 volt supplies to the vertical output circuit. CURE: Replace original .33 watt, 1 ohm MF with .5 watt, 1 ohm MO resistors. Use ONLY 4835 116 57109. TIP: If one of these resistors fail replace both with the above part. ********************************************************************************************************** ********* Since 1972 Jim Myers Telrad Electronics Fort Wayne, Indiana Intrepid Video Support wrote: > 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 ----- > > > ----------------------------------------------------------------------------- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/ ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/