Thursday, August 28, 2014
How to Fix Switching Power Supply CPU Computer
When you turn on the computer but it not working, of course the problem is electrical conditions is not installed, or maybe the power supply is damaged. For a Mechanic/ Technician would check the power supply section. Once you open the block power supply on your computer will certainly replace the power supply with the new block.
But you have ever tried to fix Switching Power Supply CPU Computer, then where is the location of the damage?
Ive had some time fix (repair) Switching Power Supply CPU (Central Processing Unit). From experience Ive found on the transformer primary is connected to the Transistors (in heat sink) are damaged condition.
When replaced a fuse but still no outputs power in secondary, FET Transistors is damaged, replace this Transistor with new parts.
When you have replaced/ installed still not lit, try searching for the groove;
[TP = Test Probe];
- @ Measure the voltage of the (TP1) = 220VAC power source (be careful),
- @ (TP2) Fuse = 220VAC,
- @ (TP3) Diode Bridge on the positive voltage to the ELCO xx uF/450V = 250VDC,
- @ (TP4) Transformer Primary I = 250VDC,
- @ (TP5) FET transistor DRAIN / Collector (Transformer Primary II/ feedback)
- @ (TP6) check GATE/ Base = 2-6V, at the gate gets electricity from positive to 2x220KOhm. Resistor from Diode, some voltage to the IC (Integrated Circuit), when no voltage is trying to measure the value of the resistor. I often find damage to the resistor; its good to also replace the IC LM 3842, driver Transistor to GATE/Base if damaged.
- @ (TP7) check the voltage at each output, measured at the output diode cathode. When issuing voltage power supply switching means your CPU can already be used again. CPU Power Supply output voltage = 3V, 5V,-5V, 12V.
| How to Fix Switching Power Supply CPU(Computer) |
So from my experience, check the fuse, FET, IC LM 3842, 2x220KOhm series resistor, and the other on the transformer primary, and then check the output voltage on the secondary.
So, may be useful.
Follow the next articles from me about Power Supply,
Bustamsyah
So, may be useful.
Follow the next articles from me about Power Supply,
Bustamsyah
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment