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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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#1
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Tatung Monitor
I have a Tatung TCM-1002 monitor. When turned on a green light by the power
switch flashes but no picture. If I hold hair dryer on one corner of smaller circuit board it comes on and stays on. Any ideas? |
#2
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Tatung Monitor
"Wayne Fitzner" wrote in message ... I have a Tatung TCM-1002 monitor. When turned on a green light by the power switch flashes but no picture. If I hold hair dryer on one corner of smaller circuit board it comes on and stays on. Any ideas? Are there any electrolytic capacitors in that area, and is it the power supply section? Electrolytic capacitors are notorious for causing this sort of problem. Let the monitor cool and heat each component in the area with the tip of a soldering iron, taking care not to damage them. Try and power it on between times. That should help you pinpoint the offending part. Dave |
#3
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Tatung Monitor
Wayne Fitzner wrote:
I have a Tatung TCM-1002 monitor. When turned on a green light by the power switch flashes but no picture. If I hold hair dryer on one corner of smaller circuit board it comes on and stays on. Any ideas? cracked solder joint. get your mag glass out and iron.. -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#4
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Tatung Monitor
I did what you said and found the capacitor. Got new one at Radio Shack and
now it powers up like it should. Thanks!!! "Dave D" wrote in message ... "Wayne Fitzner" wrote in message ... I have a Tatung TCM-1002 monitor. When turned on a green light by the power switch flashes but no picture. If I hold hair dryer on one corner of smaller circuit board it comes on and stays on. Any ideas? Are there any electrolytic capacitors in that area, and is it the power supply section? Electrolytic capacitors are notorious for causing this sort of problem. Let the monitor cool and heat each component in the area with the tip of a soldering iron, taking care not to damage them. Try and power it on between times. That should help you pinpoint the offending part. Dave |
#5
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Tatung Monitor
"Wayne Fitzner" wrote in message ... I did what you said and found the capacitor. Got new one at Radio Shack and now it powers up like it should. Thanks!!! Well done :-) You may find other capacitors will fail soon, but at least you know what to look for next time and they are very cheap components to replace.. Dave |
#6
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Tatung Monitor
Dave D wrote: "Wayne Fitzner" wrote in message ... I did what you said and found the capacitor. Got new one at Radio Shack and now it powers up like it should. Thanks!!! Well done :-) You may find other capacitors will fail soon, but at least you know what to look for next time and they are very cheap components to replace.. Dave PMFBI, but I found this thread pretty interesting. Are you saying that the 'lytics in this set are notorious, or of this brand, or in general? What is it about an electrolytic that would make it fail at room temperature but work OK when hot? I thought the can-types were just a couple of long sheets of aluminum foil w/ an insulator between? Thanks. |
#7
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Tatung Monitor
PMFBI, but I found this thread pretty interesting. Are you saying that the 'lytics in this set are notorious, or of this brand, or in general? In general they're a common failure, for a while it was really bad due to counterfeit electrolyte circulating. What is it about an electrolytic that would make it fail at room temperature but work OK when hot? I thought the can-types were just a couple of long sheets of aluminum foil w/ an insulator between? Thanks. I don't know why, but that's the usual failure mode, they dry up and the ESR increases. Cold temperature also causes it to increase so they tend to act up first when cold, then they dry up further and don't work anymore at all. |
#8
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Tatung Monitor
"Mr. Land" wrote in message ups.com... Dave D wrote: "Wayne Fitzner" wrote in message ... I did what you said and found the capacitor. Got new one at Radio Shack and now it powers up like it should. Thanks!!! Well done :-) You may find other capacitors will fail soon, but at least you know what to look for next time and they are very cheap components to replace.. Dave PMFBI, but I found this thread pretty interesting. Are you saying that the 'lytics in this set are notorious, or of this brand, or in general? Electrolytics are IME the least reliable component in general, particularly in switchmode power supplies. Any 'strange' fault qualifies for close attention to electrolytics IMO. What is it about an electrolytic that would make it fail at room temperature but work OK when hot? I thought the can-types were just a couple of long sheets of aluminum foil w/ an insulator between? With an electrolyte paste. Maybe the electrolyte partially dries up and the heating process temporarily reactivates and/or redistributes it, but that is a pure guess on my part. Dave |
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