I try to repair the power supply atx p4 350 watts all component around Q ksc5027 is good , transistor c945 is good .
i need schematics diagram for power supply p4 350ATX
i need datasheet IC AT2005
i need troubleshooting to help me to repair the power supply
please help me
One reference indicated AT2005 is the same as WT7520. I think WT7520 datasheet has some errors, but have found no one to ask about them. I need schematic of Powork PW-600, using WT7520; and a better WT7520 datasheet.
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<br />if you have some knowledge about electronic component, about multimeter; you can easily learn to repair the ATX PSU. here you find a simple presentation that allow you to understand the role main components with a photos.<br /><b><u>Presentation 1:</u></b><br /><br /><img src="mabroukmedal_5.JPG" /><br /><b><u>Presentation 2:</u></b><br /><b></b> <br /><br /><img src="mabroukmedal_6.JPG" /><br /><b><u>presentation 3:</u></b><br /><b></b> <br /><br /><img src="mabroukmedal_7.JPG" /><br /><b><u>here you find the schematic diagram:</u></b><br /><b></b> <br /><br /><br /><img src="mabroukmedal.GIF" /><br />the component side :<br /><br /><img src="mabroukmedal_0.GIF" /><br /><br /><img src="mabroukmedal_8.JPG" /><br /><b><u>the solder side:</u></b><br /><br /><img src="mabroukmedal_1.GIF" /><br /><b><u>Step 1:</u></b><br /><br /><img src="mabroukmedal_9.JPG" /><br /><br /><b><u>Step 2:</u></b><br /><br /><img src="mabroukmedal_11.JPG" /><br /><b><u>Step 3:</u></b><br /><b></b> <br /><b></b> <br /><br /><img src="mabroukmedal_12.JPG" />
I would also have liked to have had a schematic diagram for my ECHOSTAR 450w ATX power supply.
Not having one though, I have replaced two capacitors (one with a bulging top) and another with a leaking top, three rectifiers (two shorted and the third had a cracked case), and have ordered transistor Q1 (also shorted). Will also need to repair trace damage on the bottom of the circuit board. Other components check out OK so I hope it will be working again after the transistor arrives Monday. I need the -5v this one supplies to get my old computer running so I can retrieve last year's tax info.
Getting a schematic is rather doubtful. You might be able to get a general idea of the circuit from somewhere on the 'net.
Was the power supply dead?
ATX style power supplies have both a standby and main section. The standby supplies a low current +5 volts to a small portion of the motherboard.
If the component failure is in this section, this standby voltage will be missing or incorrect, and the computer will be dead- won't power on at all.
I've seen a number of catastrophic failures in this standby circuit, and repair isn't suggested or economically feasible, especially as some parts often poof beyond identification.
When the pwr button is pushed, the main section comes on, and supplies +5 (Red wires), +12 (Yellow wires), +3.3 (Orange wires), -5, -12. Look here for this info http://pinouts.ru/Power/atx_v2_pinout.shtml
Voltages are precisely regulated, and any substantial deviation (more than a few 10ths of a volt) indicate a problem, especially on the +5 & +3.3 lines.