By Jestine Yong on May 17, 2025
This PC was brought to the Workshop because it was not powering on. First of all, the Power Supply was checked and it was not working.
The Power Supply was extracted from the cabinet.
It was an expensive SMPS, an 500w EVGA Certified Power Supply 80 Plus (white). Then it was necessary to be taken it into consideration and do the impossible to carry out the reparation. The effort would be valuable anyway.
It was decided to apply a method very convenient in my own opinion when it comes to PC´s SMPS repair, and then the repair became easier as I thought. The Digital Multimeter was selected in Continuity scale to test all the v-outs. Some images are shown here.
As it can be seen, there was a short in the blue cable (-12v). It was time to disarm the SMPS and to do reverse engineering of this blue cable.
When it was done, know what? There was a Schottky Diode shorted, as it can be seen in the next image.
It was an SR 2100: SCHOTTKY BARRIER RECTIFIER VOLTAGE RANGE – 20 to 200 V CURRENT – 2 A. The Datasheet can be found by surfing in the web. It was substituted for a similar SB2100: 2.0A SCHOTTKY BARRIER DIODE.
Once it was connected in the PCB, the short had gone, as shown in the next photo.
Then the SMPS was tested with the Power Supply Tester and let´s see the final result.
The SMPS was inserted in its place and the PC started working fine, as it was expected.
This simple but valuable repair was satisfactory to me because another expensive device was saved.
The PC has been working fine for some months till now.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on Repair of ASUS H81M-A 4th Generation
Likes(40)Dislikes
(0)