I have a Dell Optiplex 990 power supply, which shorted out the L240AS-00 transistor and also burned out the H1137L2B "power integration" IC. I can't find the schematic for it, much less one in stores. No one knows about it. The TNY288 is useless.
Please: Can someone help me find a direct replacement?
Could someone attach the power supply circuit? It's identical to the one discussed in this forum.

Thank you very much,
Claudio A. Denegri