Phil did you try to use freeze spray? Al Marquardt ampm@xxxxxxx Al Marquardt Electronic Repair 206 W Main Girardville Pa. 17935 ----- Original Message ----- From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Saturday, March 05, 2005 10:54 AM Subject: [TechAssist] VS4551 mitsubishi ,no power up when cold: only thump-thump. still not fixed > ARRRRG! I watched this set an hour last night, unplugged it, went home. > This morning, again, plugged it in cold, pushed power: "Thump-Thump..." > Same crappola. > I immediately unplugged it, removed back, removed two screws holding the > chassis frame in. Plugged it in, powered it up perfectly.Then I flexed, > tapped,etc.No effect. I am still not sure if this is a borderline cap > discharging overnight and cooling(bad ESR) or some bad connection. I'm > stumped. I KNOW the cap i replaced last night was bad (see thread below). > Phil Bader > > > FIX? > I may have fixed the start up problem. I first replaced IC9A1 , an SE130 > regulator. > But I then ESRd caps all over. I came across one cap soldered to the > bottom of the board to 5 pin regulator,IC9A2 (looked like soldered to > pins 1,2) It was a 4.7mfd@50V. It was totally open. > I replaced it. > Unit came right up with good picture.. Tomorrow morning will be the test > for the cold start. > Phil Bader > > Phil Bader wrote: > >>The fix for the "arcing" vertical distortion was not the yoke >>connection, but many cold solder joints on main board, especially the >>board yoke plugs. Can't believe I missed them all. Resoldered, fixed. >>I came in this morning, and the TV being cold and unplugged all night, >>pushed power and I only heard a once per second "thump-thump-thump" >>noise. We feel this may be one of the PS electrolytics with hi ESR, and >>when cold, does this but if warms up, runs OK. >>Anyone have any specific tech tip on this model for this??? >>This will be #3 repair to get this out the door! >>Phil Bader >> >>This played two days OK. Then the vertical distorted like arcing, >>pull-up, lines stretched,bowed etc. >>I did resolder the vert output IC. If I hit the side of the setwhile >>happening it cleared. >>I saw somewhere in a fix email,was to solder the yoke pin.Sounded like >>they meant actually at the yoke (as opposed to on the board) I quote: >> >>"Cure: Found bad solder connection at connector on red yoke. Reason for no >>deflection is these connector run in seres to the other two CRT's." >>Anyone care to clarify this? >>Phil Bader >> >> >> >> >> > > -- > > Philip Bader > Jan Phyl TV Inc. (estab. 1976) > 3420 Recker Hwy. Winter Haven, Fl. 33880 > Fax (863) 299-8821 > email: tjanphyl@xxxxxxxxxxxxxxx > > > > > -- > > Philip Bader > Jan Phyl TV Inc. (estab. 1976) > 3420 Recker Hwy. Winter Haven, Fl. 33880 > Fax (863) 299-8821 > email: tjanphyl@xxxxxxxxxxxxxxx > > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 266.5.5 - Release Date: 3/1/2005 > > ----------------------------------------------------------------------------- > This Email List is Public. Remove: http://www.tech-assist.org/remove.htm > Lost Password: http://www.tech-assist.org and select "Login Problems?". > Email Archives: //www.freelists.org/archives/techassist/ > > ----------------------------------------------------------------------------- This Email List is Public. Remove: http://www.tech-assist.org/remove.htm Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/