Another ATX power supply repair video, where things are not as they appear, and I get confused by more red herrings. After extolling the virtues of visual inspection, Murphy turns all that on its head, in a repair where visibly damaged components work perfectly, and dead components look perfect.
0:00 - Introduction 0:22 - Quick overview of a Dim Bulb Tester 2:49 - Initial diagnostic with the light-bulb 3:50 - A quick diagnostic on the secondary side 5:29 - A note about some Dell "ATX" PSU wiring 6:21 - Verifying output (or lack thereof) on the +5vSB rail 6:56 - Looking further into the +5vSB rail 9:29 - Disassembling the power supply 10:41 - Investigating the PSU layout 12:07 - Notes on visual inspection of components 14:02 - I spy with my little eye 16:50 - Confused by Murphy once again! 18:32 - The penny begins its descent? 19:29 - The first smart idea 20:42 - Speculating on possible suspect parts 22:20 - Some more testing & speculation 23:03 - Rumination & ideas on short tracing 26:14 - Finally checking the diode I suspected in the beginning 28:01 - Looking up a datasheet 29:32 - Thoughts on such early component failure 30:33 - An (un)suitable replacement diode 31:55 - Installing the test diode 32:51 - The dawn of realisation finally breaks 33:18 - Setting up for testing 35:06 - The power up test 36:47 - Conclusion
-------------------------------------------- | Repair Notes | -------------------------------------------- Power Supply: Zalman ZM400-GVN
Symptoms: PSU appears dead, all outputs are zero volts & supply will not power up. Fault: Shorted rectifier diode (SR640) in +5vSB power supply circuit. Solution: Replace +5vSB rectifier diode. --------------------------------------------