Question about Enhance Technology SFX-1211J, Enhance 110W 1211J Power Supply (SFX1211J) Power Supply

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Enhance Power Supply only works unconnected to computer

I have an enhance sfx1211j power supply that had a bad fan and swollen output filter capacitors. Even in this condition the PS was producing voltages as the computer was still running. I replaced the fan and the filter caps and now the PS won't power up the computer. The PS DOES turn on unconnected to the computer when you ground the green wire and seems to have all the proper voltages. I verified this by comparing its voltges to that of a brand new unit wire by wire. Even the levels of AC ripple are the same. The new unit does power up the computer. How can this be?

Posted by smartbomb on

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zbyszek

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Make sure, that you did not made any short on pc-boad. And check polarity of new capacitors. They are easy to reverse

Posted on Nov 16, 2007

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Hi when under load the PSU voltage is obviously dropping off, With a Power unit, there are 3 things to keep in mind. They are too expensive and too dangerous to repair, Also inexpensive to replace. Regards mistyman

Posted on Sep 30, 2007

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This is not DIY and quite technical, I've would advice you to look for a qualified technician or send it to repair shop to isolate the problem.

But first check if your unit is under warranty then avail it because the manufacturer of your unit will fix it for free or with a little charge only.

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This is not DIY and quite technical, I've advice you to look for a qualified technician or send it to repair shop to isolate the problem.

But first check if your unit is under warranty then avail it because the manufacturer of your unit will fix it for free or with a little charge only.

Hope it may help you.

Thanks for using fixya.

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2 Answers

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Hi,

This is an indication that you have a problem on the power supply section or on the load because of the following reasons : 1. Over Voltage - the regulator might be cycling on over voltage due to lack of load. 2. Over Current Protection - excessive load or faulty power supply cycling will trigger the over current protection circuit. This is because of open fusible resistor in line with a shorted Voltage regulator IC. 3. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive/drop of voltage. 4. A problem with the microcontroller, relay or its driver, or standby power supply.

This is not DIY and quite technical, I've advice you to look for a qualified technician or send it to repair shop to isolate the problem.

But first check if your unit is under warranty then avail it because the manufacturer of your unit will fix it for free or with a little charge only.

Hope it may help you.

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This is an indication that you have a problem on the power supply section or on the load because of the following reasons : 1. Over Voltage - the regulator might be cycling on over voltage due to lack of load. 2. Over Current Protection - excessive load or faulty power supply cycling willtrigger the over current protection circuit. This is because of open fusible resistor in line with a shorted Voltage regulator IC. 3. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive/drop of voltage. 4. A problem with the microcontroller, relay or its driver, or standby power supply.


This is not DIY and quite technical so I've advice you to look for a qualified technician or send it to repair shop to isolate the problem.


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Hope it may help you.

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Hi,


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2. Over Current Protection - excessive load or faulty power supply cycling will trigger the over current protection circuit. This is commonly caused by faulty regulator IC/transistor which open the fusible resistor,fuse on the output stage of the supply.

3. A problem with the microcontroller, relay or its driver, or standby power supply.


This is not DIY and quite technical so I've advice you to look for a qualified technician or send it to repair shop to isolate the problem.


But first check if your unit is under warranty then avail it because the manufacturer of your unit will fix it for free or with a little charge only.

Hope it may help you.

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5. A problem with the microcontroller, relay or its driver, or standby power supply.

This is not DIY and quite technical so I've advice you to look for a qualified technician or send it to repair shop to isolate the problem.


Thanks for using fixya.

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2. Over Current Protection - excessive load or faulty power supply cycling will

trigger the over current protection circuit.


3. High voltage - there might be an excessive high voltage or some other system detecting an out of regulation condition. However, in this case, there should be some indication that the deflection and HV is attempting to come up - momentary whine, static on the screen, etc.


4. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive or drop of voltage.


5. A problem with the microcontroller, relay or its driver, or standby power supply.


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1. Over Voltage - the regulator might be cycling on over voltage due to lack of load.


2. Over Current Protection - excessive load or faulty power supply cycling will

trigger the over current protection circuit.


3. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive voltage and the unit will not power up unless isolated.


4. A problem with the microcontroller, relay or its driver, or standby power supply.


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1. Over Voltage - the regulator might be cycling on over voltage due to lack of load.


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4. A problem with the microcontroller, relay or its driver, or standby power supply.


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