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<blockquote data-quote="pulsetrain" data-source="post: 627287" data-attributes="member: 19606"><p>Just taking a guess from the photos:</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/19606/1637547555_board.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>HT1 looks like an NTC thermistor placed in series to limit inrush current on power up.</p><p>The blue component right next to it (under the foam) is probably a varistor placed across the mains input.</p><p></p><p>The black IC Sandta circled is an optocoupler used to provide isolated feedback through R13 to PWM controller chip U1 to control switching and regulate voltage output.</p><p></p><p>The transformer is in the middle of the pcb under the heatsink, where the switching transistor might be mounted.</p><p></p><p>I think you should be able to work it out Sandta. I find it satisfying to get something working again for a few dollars instead of throwing it in the bin.</p><p></p><p>Wouldn't recommend the average hobbyist poke around an SMPS board though, especially with the cheap multimeters that most people have.</p></blockquote><p></p>
[QUOTE="pulsetrain, post: 627287, member: 19606"] Just taking a guess from the photos: [img]https://www.prospectingaustralia.com/forum/img/member-images/19606/1637547555_board.jpg[/img] HT1 looks like an NTC thermistor placed in series to limit inrush current on power up. The blue component right next to it (under the foam) is probably a varistor placed across the mains input. The black IC Sandta circled is an optocoupler used to provide isolated feedback through R13 to PWM controller chip U1 to control switching and regulate voltage output. The transformer is in the middle of the pcb under the heatsink, where the switching transistor might be mounted. I think you should be able to work it out Sandta. I find it satisfying to get something working again for a few dollars instead of throwing it in the bin. Wouldn't recommend the average hobbyist poke around an SMPS board though, especially with the cheap multimeters that most people have. [/QUOTE]
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