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AC/DC power supply with 19.5V 7.9A issue
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<blockquote data-quote="user 30718" data-source="post: 540136" data-attributes="member: 30718"><p>These are common on dell laptops (pre usb c).</p><p>Recent dell units are 130w. Older ones are 180 and 200w.</p><p></p><p>It is a switch mode supply (smps) so expect over 350v on that 450v cap (nasty. Ask any one who worked on valve amplifiers)</p><p></p><p>The guys on here often suffer 'compassion fatique' and if you can ignore the 'I told you once' arrogance, there is useful house wiring info to be had. </p><p></p><p>Electricians, like everyone, do not know 'what they don't know'. Low level concepts can escape them. To conceal this, they may be defensive. Do not be put off. While random part swapping may not be the best use of time, it can be a great way to learn.</p><p></p><p>Sadly, buying a new unit is usually cheaper if you are paying today's inflated 'engineer' prices.</p><p></p><p>Lookup swps on electronics or amateur radio websites. The front end (mains diodes, chokes and caps) are easy to test. The output side is a lot harder.</p><p></p><p>Have fun, do not be put off, be carefull of the absolutely lethal voltages. Remember that an inquisitive mind is far superior to a closed one. But if you don't understand why the DC on the input side is so dangerous - please read up on it.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="user 30718, post: 540136, member: 30718"] These are common on dell laptops (pre usb c). Recent dell units are 130w. Older ones are 180 and 200w. It is a switch mode supply (smps) so expect over 350v on that 450v cap (nasty. Ask any one who worked on valve amplifiers) The guys on here often suffer 'compassion fatique' and if you can ignore the 'I told you once' arrogance, there is useful house wiring info to be had. Electricians, like everyone, do not know 'what they don't know'. Low level concepts can escape them. To conceal this, they may be defensive. Do not be put off. While random part swapping may not be the best use of time, it can be a great way to learn. Sadly, buying a new unit is usually cheaper if you are paying today's inflated 'engineer' prices. Lookup swps on electronics or amateur radio websites. The front end (mains diodes, chokes and caps) are easy to test. The output side is a lot harder. Have fun, do not be put off, be carefull of the absolutely lethal voltages. Remember that an inquisitive mind is far superior to a closed one. But if you don't understand why the DC on the input side is so dangerous - please read up on it. Good luck. [/QUOTE]
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AC/DC power supply with 19.5V 7.9A issue
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