I'm in the US and computer only works when power supply is in 230V position. How do I diagnose this?

So, I replaced a computer PSU about six months ago. And, the computer power down intermittently.

I've found:

• it's not over heating. Monitor shows it running cool.
• it's not graphics related. Passes stress test.
• I can reproduce by grabbing app chrome, and moving window quickly (using Win8).
• it often powers down abruptly before it finishes booting.

Figure the new power supply is the issue.

Don't want to waste time, so looking to buy new computer.

Last ditch effort: change power supply setting from 115V to 230V.

Setting the power supply to 230V works! Computer now works without a hitch! But, why? And, will it cause more damage?

Questions:

1. Is the power supply broke?

2. Is the red-switch-cover placed incorrectly?

3. Can I use the computer without damage?

4. How do I verify?

6

1 Answer

1. It's likely the 115V is broke, and the 230V circuitry is working fine, thus why it works.
2. It looks correct from the photo you supplied
3. In the short term, probably. You're technically "starving" your PC of power since the PSU has 230V available but is only drawing ~115V.

A power supply supplies power, it's not a transformer - so it's not going to all of a sudden boost your power supplied to 230V if you're not receiving that from the wall. The 115V/230V on the back is only there for the purpose of setting the correct Input voltage, and different circuitry is used depending on which setting is selected. Maybe the 115V circuitry is broken and the 230V works fine (for now). If it's still got the voltage selector on the back, it's likely a shoddy PSU and should be replaced as soon as viable.

3

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