Hello there, i have some low end ATX smps boards lying around so i thought that i could use them in some other way so i decided to set it up as a power supply for my 2 linksys routers and bandluxe 3G router all running at the same time, it worked for abt a year then one evening it suddenly went dead, all preliminary checks were ok, fuse not blown, rec diodes ok, primary caps ok, switching transistors ok, sec rec diodes ok and sec filter caps ok, i noticed that my 5vsb voltage was too low, abt 1.4 volts only, checked the schematic and the 5vsb ckt has 2 transistors, one for the 5 volts and one for the startup power of the TL494 chip that should be 10 to 12 volts (measured from a spare board) both transistors are ok, when i remove the VCC pin of the TL494 the 5vsb and the 12 volts supply of the TL494 chip became normal, i removed the chip and tested it on a good board and grrrrr the TL494 chip is working, can pls somebody help me, confused and currious 
