I had stopped repairing Atx power furnish many years back due to the new one cost very cheap. It's not worth to mend it because the spare parts sometimes were much more high-priced than getting a new power supply. Searching for Atx power furnish spare parts was not easy as many of them you can't even find them on the internet. Not only that, many complicated and distinct designed by power furnish manufacturers had eaten up our precious troubleshooting time too because of we need time to understand how all these distinct designed power furnish work.
Some of the power furnish designs were using the Pwm Ic (Uc3842) and power Fet, some use the double transistors while some use only a single power Ic in the original side. Because of the manufacturers wants the make to be made into contract size, many secondary or even original power furnish circuit were build into a modular board (smaller board). This made troubleshooting even more difficult because many times the meter's probe can't reach to the testing point.
Professional Photo Printers
The real surmise why I had stopped repairing Atx power furnish was the behalf margin. If you fee to high the customers rather buy a new unit with one year warranty given. If you fee too low, you may end up in the losing side because of the components replaced, electricity and etc. If you fee reasonable, the behalf margin gained can't even cover your time spent on troubleshooting it. I'm here not to discourage you to stop repairing Atx power supply, any way if you have the time, have contacts getting cheap power furnish components, easy to way many power furnish schematic diagrams and etc then you may go ahead to mend it.
Okay back to the article, one of my customers had asked me to mend his Atx power supply. I told him to get a new one (since it was very cheap) but he said he couldn't find one that suits his customer's Cpu. He wanted a power furnish that is either same size or smaller then the original one with same or higher specification but all he could find was a suitable size power supply!
As a favors to my customer, I would do my best to help him to mend the Atx power supply. When the power furnish was switch on, measurements were taken. The results were over voltage. The 12 volts line shot up to 13 + volt and the 5 volts line became 5.6 volts. After the casing was removed, I found the inside was very dirty and I used a vacuum cleaner and a brush to clean off the dirt. Then I saw four filter electrolytic capacitors had bulged at the top casing.
As you know, we as electronic repairers can't just see things at only one side; we have to see the other sides too. What I mean was, try to see if there are any suspicious components that contributed to the failure of the power furnish such as broken components, dry joints, loose connection, decay glue and etc before start checking the suspected area.
What I saw was at the original side there were some components covered with decayed glue as seen in the picture. I have to considered remove it by scrapping off the layers of the decayed glue while preserving the outer layers of the components. Once it was done, I clean it with the Thinner solution. Decayed glue could cause serious or intermittent question in electronic equipment because it can be conductive.
If you mend any Atx power supply, make sure you check the fan too because some power furnish failure was due to heat caused by a faulty fan. The purpose of the fan is to suck out all the heat generated by the components inside the power supply. In order for the fan to run smooth, you can service it by using a Philips oil base spray as shown in the photo.
Once the four electrolytic capacitors were supplanted and the decayed glue removed, I then have to plug it into a junk motherboard together with a hard disk to test the operation of the Atx power furnish and quantum all of its output voltages. It seems like the output voltages were back to normal. Once everything is okay I then test it in a working Cpu to check for the display.
The surmise I test it with a junk motherboard first as a way not to cause my good motherboard to go bad just in case if the output voltages is still very high. Great safe than regret later. By the way you can't test a power furnish without load otherwise it may turned on for a while and then shut down. If you do not have a junk motherboard you can always at least associate a hard drive and a wire jumper to its connector to turn on the Atx power supply.
Do you know that most Atx power furnish is using dual schottky barricade rectifiers to turn the ac wave into Dc voltages? Even in Lcd Monitor power supply, a dual schottky were used in the rectification too. For your information, checking schottky diode is distinct from checking a normal diode. With analog meter set to X10 K ohms, it should show some leakage reading when doing the reverse bias test. If this component becomes faulty it is very easy to get a replacement, of procedure you have to get one with the right specification. That's all for today, hope you enjoy the narrative and come back more often to check out for any latest mend techniques that I'm going to share to you.
ไม่มีความคิดเห็น:
แสดงความคิดเห็น