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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There were 2 Switching power supply circuit inside the ATX PSU. There's a Standy PWM circuit whichSupply +5V to the PWM IC of the Main PWM. Stand by pwm still working or insufficient voltage, lower than +5V. This is the reason you still have Green light. Check or replaced small filter capacitor around 100 MFD 16V, open resistor or shorted diode that was nearest of the PWM IC.. Watch out for charge voltage on big capacitors.
What a wastage of power ? I suggest not to fan more but to reduce heat generation. Better check, why excess heat generated? Surely low power devices overdrived. Just modify it. Like low voltage schottky rectifier. insted of using 20A per channel, they use 3A per channel. Your PCB of SMPS has the hole to cater the proper rectifiers. Just Search the datasheet, replace the overheat component with higher capacity and you solve the problem.
Sometime, poor screwing of heatsink to transistor/devices may generate excess heat too.If you can replace the fan, you must do the other work I recomend. GOOD LUCK.
Please give motr of the devices fixed on same heat sink. Search for SMPS IC like FPS or similar, search their application notes and the datasheet of the nMOS. then you can get idea. without those data Solution is impossible.
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.
could just be the regulating power transistors are burned out or one of their biosing components, there a few meaty capacitors that may be causing a surge, but the safe thing to do would be to start with a new one, the reason is, modern drives are so sensitive that you could blow their circuitry and then lose the harddisk! All the best - the Yeti
Maximum output of any smps is not based solely on the type of power switching transistors used. One of the parameters which will be crucial is the Ic (Max collector current rating). But this by itself isn't the lone determining factor either.
Other design factors which will come into play are the switching transformer, its size and windings. A smaller transformer and smaller wire gauge windings will generally mean lower max power output.
Max power output measurements probably require a set of load resistors, volt and amp meters, monitoring the 3.3, 5, 12 volt lines.
I'm not an engineer, but have had numerous computer power supplies apart, repairing some, junking some. Quality of construction or lack thereof is generally obvious. PC Power and Cooling probably builds high quality units. There are plenty of cheap, low cost power supplies which frequently die after a year or two, sometimes taking a motherboard down with it.
no. not only is it cheaper in the end to buy a new supply, but there are most likely more parts (which may be hard to locate without special equipment) nuked than only the transistors. so buy a new one.