Mark, It kind of sounds like a bad cap. It's coming from the power supply circuit. I have pressure in my ears, so it's hard to pin point the location. The hum starts low and gradually increase in about 5 seconds after set is in standby. Jeff -- Intrepid Video TV/VCR Repair 263 S Front St, Steelton PA 17113 717-939-7708; (F) 717-564-4952 www.intrepid-video.com www.tech-repair.net ----- Original Message ----- From: "Mark Wentowski" <[EMAIL PROTECTED]> To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> Sent: Saturday, June 19, 2004 12:21 AM Subject: RE: [Techs] TA Admiral GOJ12333. P/S hum in s/b
A hum from where? High frequency? Low frequency? The speaker? The power supply circuit? Does the set operate normally otherwise. From my experience a high frequency noise from the supply in standby can be caused by a bad cap. They wont always test bad either but you can spot them with your scope. But if its a lower frequency "hum" then it may be from the AC line choke. A little hot glue or silicon glue can cure that. I'm guessing Jeff. If anyone has a manual on Admiral I want them to let me know about it. Admiral, Apex,........etc, etc. They never intended for those things to be repaired. No service support so far as I know but I would be thrilled to be proven wrong. Mark Wentowski Perry Hill Electronics 3836 Harrison Rd. Montgomery AL 36109 phone: (334)279-5622 fax: (334)273-9050 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Intrepid Video Support Sent: Friday, June 18, 2004 10:33 AM To: Tech List Subject: [Techs] TA Admiral GOJ12333. P/S hum in s/b Set came in dead. Replaced shorted HOT (2SD2627) with NAP 483513048195.. Set has an Orion CRT and I think the main board is Toshiba...has VMX180C imprinted on it. Set will come on now, but in stand by there is a hum. IC 501 output at 4.4vdc..Input is 6vdc. It looks like this comes from Q504(2SC1815) This is as far as I got with out a schematic. Has anyone seen this before, or have a schematic I can borrow..be faxed or emailed (of this section)to me? Thank you. Jeff -- Intrepid Video TV/VCR Repair 263 S Front St, Steelton PA 17113 717-939-7708; (F) 717-564-4952 www.intrepid-video.com www.tech-repair.net _______________________________________________ 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
