Need ATX Power Supply Repair Manual

[Strange Problem]

Hi,
I need a Repair/Service Manual for ATX Power Supply . It will be more helpful if it is a diagram based on Made by China ATX Power supply . Because in my country - China made ATX Power Supply is available .

If anyone have this, please share with me ..........

Thanks .

 

[andre_luis]

I´m aware that is not the answer you expect, but most of problems related to power supplies are statistically concentrated in switching devices ( IGBT, MOSFET ) or at the Fuse.

+++

 

[jpanhalt]

Do you mean "pin out", rather than "point out?" If pinout, this should help.

If voltages, let me know, I do have a schematic of a typical ATX laying around.

John

 

[Strange Problem]

Thanks Andre for your Reply . Yes you are right . I am facing Switching problem with an ATX PSU . This PSU has burnt out 13007 Transistor and its Base fusing Resistor 10 ohms . I have Replaced them but still it is not starting . I have checked rest all of parts of the PSU Except in Controller section's Resistors . But in Controller section - I am getting 5VSB and 5V PS-ON . But still it does not run . Even I have changed IC TL494 and LM339 also ...... but all the hail ..... It does not listen to me at all . What will I do now ??? Why it is not switching ???

 

[andre_luis]

Had you attached some load to output ?
A minimal current drain is required to SMPS works.
( I´m asking just to certify )


+++

 

[mister_rf]

Some ATX Power supply schematics:

 

[Strange Problem]

Ya .... I had tried with also . I attached a ASUS CD-ROM 52X . But no hope .......

 

[mister_rf]

ATX power supply schematics

 

[mister_rf]

ATX power supply

 

[Strange Problem]

Thumbs Up dude

---------- Post added at 01:36 ---------- Previous post was at 01:33 ----------

ATX power supply

A lot of thanks mister RF . I have given Thumbs up but How can I give you Points ...

 

[mister_rf]

ATX power supply

 

[mister_rf]

ATX power supply

 

[Strange Problem]

Ok, OK ... Thanks Dude ...... I do not need more Schematic ...... These are enough for me .

But do you have any Repairing Guide or manual ??

 

[mister_rf]

What about the ''+12V" power supply from the stand-by circuit (usually for a value of 15-25V), to be applied for the driver section, did you measure it? Any voltages on TL494 pinouts?

 

[Strange Problem]

Here is the measurement of Voltage .... Shown in the below Image ....

 

[mister_rf]

Need to check Q4 & Q5.
Also, to be sure change capacitors C9/C10, check components: R6/R7, R10/R11, D4, D3.

PS: input Power ON = low :smile:

 

[Strange Problem]

I have checked Q4 and Q5 C945 - Both of them are Fine . C9/C10 are 2.2μF/50V - this capacitors seems to be OK . Will I change it though ?? There is no R7 and R11 Resistor . They have only one fusing Resistor 10Ω Which is in Transistor's Base R6 and R10 . But they have used two signal/Crystal Diode in place of one Diode . They are D3/D4 and D5/D6 . I have checked them . They are OK . Still Do I need to change these 10Ω Resistor and D3/D4 and D5/D6 Crystal Diode (1N4148) ??

And yes you are right . PS-ON voltage seems to be low . I measured the voltage and it is 4.8V . But there is no Capacitor with the PS-ON nor any Transistor . Will 4.8V be problem for PS-ON ?? How can I increase the voltage of PS-ON to 5V ??

And one thing we need give attention in the previous Post . That is DTC (Dead Time Control) Voltage of Pin4of TL494 . As it's Datasheet DTC will be 3.3V (Maximum) at Zero Duty Cycle . And OV at Max. Duty Cycle . Here it is showing 3.2V . Is Zero duty Cycle means PS-OFF Condition ??

 

[Strange Problem]

I have changed all those capacitors, Diodes and Transistor with new one . But still the Power supply is not running . What will I do now ??

Please Response ........... I am waiting for your reply ......

 

[Hewitson]

PS_ON must be grounded for the supply to turn on..

Pleases me to see that the schematic was done on AMIGA

 

[bhaskarb]

Wow. lots of SMPS circuits here, but I want to have a circuit diagram of bit higher wattage PSUs, i.e. >= 500W - 1000W. Want to have circuits of dual rail system with almost 40-44A on +12V line. Can anybody have those circuits?