Someone snuck into the shop overnight and fixed this for me....oddly enough when I started checking the set this morning, I noticed my voltages all of a sudden appeared. Perhaps before I gave up on the unit Wed, I inadvertently fixed it.. I found B+ on the HOT, but no voltages on the hor drvr transistor, s/b 27vdc and nothing on the transformer on either winding. I hooked my Sencore up to the base of the transistor and the HOT shorted the first time, the second time the fuse in the ISO transformer blew...really odd...I replaced the HOT with a 2SD1878 soaked it in freeze spray and the set worked, got raster and every thing looked fine. I was trying to find the source of the 27 v, using a Toshiba 19A21 schematic right before I closed up yesterday..sent the schematic to a friend and we tried to figure the circuit out together.. The 27vdc is derived from the unreg 12vdc. This morning the set worked. Perhaps the HOT was failing or I repaired a bad connection some where along the line. This set uses 2SD2627 for the HOT, I replaced it with NAP #483513048195. Thanks to all that offered their help on this.
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 24, 2004 10:42 AM Subject: [Techs] 2nd REQ TA Orion TV1934 dead(2002) Does anyone have a schematic on this unit? All my S/B voltages appear to be correct and when I press power, some of my voltages increase, as if the unit is running, but never turns on. This set has no relay. On FBT, my B+ is 136.7, when I press power, it goes to 140v. The 180v line is only at 140v..so I need a schematic. I checked the FET with a new one and it seems fine. I disconnected the HOT..still no power. Disconnected the CRT board, yoke..no luck. Voltages on CRT also seem to be what they should be in run..but set won't turn on. 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: Monday, March 22, 2004 5:37 PM Subject: [Techs] TA Orion TV1934 dead(2002) This is a 2002 model, unit dead. Customer stated there was no video..but when I apply power, I hear was sounds like the SM start, power button has no effect(figures). B+ =140vd..checked many diodes, resistors and can find no problems. I suspect bad flyback, but since the set doesn't try to start, I'm not sure. Any one have any records on this, or a schematic? Thank you. Jeff Dougherty Intrepid Video TV/VCR _______________________________________________ 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
