Hi, I bought Compaq 8510P hoping to fix it. It has no 5V and 3.3V standby power. LM393 ( on picture ) was damaged: changed. Then, TPS 51120 started to overheating. After looking, I saw that one of 4 capacitors around him is 1 ohm resistance. After desoldering, those pins are still 1 ohm. Cutted off wife from pin 19 of TPS51120, now I have 3,3V od that pin, and 5V on other capacitor, but still there is no standbay power. If it can be fault in SMSC KBC1070-NU?

There could be anything powered by 3,3 V.
You need regulated power supply to give the curcuit 3,3 volts with more amperage.
The shorted chip or whatever will be burning up and thus easily located.