Re: Dell 2407WFPb Monitor - Bad Cap

The Capacitor, C605, 120uF, 450V is definitely and by far the most common failure on these Benq made PSUs. It is so sad that the failure of this capacitor can be so catastrophic. Most of the failures I have seen, are where electrolyte has leaked out through a lead-hole in the rubber bung. The capacitors lead then appears to get etched away by the electrolyte.

I hope this may help somebody. I had a 2405FPW that was in a bad way.

Usual failure mode: Open circuit C605. Cascade failure ensues.

It is working now. There was some parts that were definitely bad, and some parts that tested OK. There were some parts that I just did not feel comfortable proceeding without replacing them.

Note: the attached circuit diagram is for a 2407. That said, the similarities between the 2405 and 2407 PSUs are very handy. Check my comments in the PDF to see what I found.

Good luck, these PSUs generally will work...

Re: Dell 2407WFPb Monitor - Bad Cap

I hope this may help somebody. I had a 2405FPW that was in a bad way.

Usual failure mode: Open circuit C605. Cascade failure ensues.

It is working now. There was some parts that were definitely bad, and some parts that tested OK. There were some parts that I just did not feel comfortable proceeding without replacing them.

Note: the attached circuit diagram is for a 2407. That said, the similarities between the 2405 and 2407 PSUs are very handy. Check my comments in the PDF to see what I found.
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