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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Great Mystery Magnavox TV 27MS3404/17 Problem
Hi,
I have a Magnavox TV model 27MS3404/17, chassis L01.1UAC-7638 (mfg. 06/05) in my service shop that comes on, picture shows for a few seconds, then the TV goes "off". Actually the horizontal sweep shuts down. The SMPS is still "running" at "full power" (Reg B+ is 130V). Note: The HV was around 27KV with picture showing. If I use a pattern generator (color bars, cross hatch, etc.), the TV stays on!!!!! However, with a normal TV signal, it goes off in a few seconds after the picture shows. With no signal (snow), the TV stays on much longer but it still goes off. It only stays on with the pattern generator!!!! Note: I had tried different "Screen" (on FBT) settings. Any idea what is the cause of this weird problem? Thanks in advance, Brad Before you type your password, credit card number, etc., be sure there is no active keystroke logger (spyware) in your PC. |
#2
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Great Mystery Magnavox TV 27MS3404/17 Problem
"Brad" wrote in message ... Hi, I have a Magnavox TV model 27MS3404/17, chassis L01.1UAC-7638 (mfg. 06/05) in my service shop that comes on, picture shows for a few seconds, then the TV goes "off". Actually the horizontal sweep shuts down. The SMPS is still "running" at "full power" (Reg B+ is 130V). Note: The HV was around 27KV with picture showing. If I use a pattern generator (color bars, cross hatch, etc.), the TV stays on!!!!! However, with a normal TV signal, it goes off in a few seconds after the picture shows. With no signal (snow), the TV stays on much longer but it still goes off. It only stays on with the pattern generator!!!! Note: I had tried different "Screen" (on FBT) settings. Any idea what is the cause of this weird problem? Is the beam current less with the pattern generator signal? Might be a clue there. |
#3
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Great Mystery Magnavox TV 27MS3404/17 Problem
Brad wrote: Hi, I have a Magnavox TV model 27MS3404/17, chassis L01.1UAC-7638 (mfg. 06/05) in my service shop that comes on, picture shows for a few seconds, then the TV goes "off". Actually the horizontal sweep shuts down. The SMPS is still "running" at "full power" (Reg B+ is 130V). Note: The HV was around 27KV with picture showing. If I use a pattern generator (color bars, cross hatch, etc.), the TV stays on!!!!! However, with a normal TV signal, it goes off in a few seconds after the picture shows. With no signal (snow), the TV stays on much longer but it still goes off. It only stays on with the pattern generator!!!! Note: I had tried different "Screen" (on FBT) settings. Any idea what is the cause of this weird problem? Thanks in advance, Brad Just did one of these... it's a little 25v 47ufd cap a couple of inches away from your HOT. I don't remember the position, but it's the only little cap right off the HOT (a couple of inches.) Change it out and you're probably good. Good luck. Kevin S. |
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