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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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Dead power supply making "whining" sound
Hello,
I have a dead 5V power supply from a Linksys router. It is making a very high pitch "whining" sound. I opened up the unit and noticed one of the caps is deformed (the top of the cap is more rounded). What could cause this high pitch sound? Is it the cap or other component? Mike McWhinney |
#2
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Dead power supply making "whining" sound
wrote in message oups.com... Hello, I have a dead 5V power supply from a Linksys router. It is making a very high pitch "whining" sound. I opened up the unit and noticed one of the caps is deformed (the top of the cap is more rounded). What could cause this high pitch sound? Is it the cap or other component? Mike McWhinney The problem will be the cap. If you had an ESR meter to check it with, you would find that the reading was away out of the window. Replace the cap with a high quality low ESR type, specced for use in switch mode power supplies, and with a 105 deg temperature rating. It is worth also replacing any others that are near to anything that gets hot. If there's not too many in there, just replace them all. They're cheap enough. Word of caution. Be careful running the supply with its case off. The primary side of a switcher is VERY dangerous ... Arfa |
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Dead power supply making "whining" sound
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