Had a BE go bad recently. Troubleshooting: Not communicating; looked at voltages on the edge connector and found 7 to 6 on a good unit showing a little over a volt but on the faulty unit over 3 volts; cleaned a spot between a couple of pins on the inside side of the BE chip and now have the same voltage between edge pins 7 and 6 but not communicating. The LED was flashing the correct sequence and duration so it wasn't the CP2102->crystal but found both the SUSPEND and SUSPEND-NOT pins high. They should be complementary. Not shorted so internal or elsewhere on the board. Tried a manual reset of the CP2102 bringing the reset pin to ground but that was no help either. The CP2102 seems to have the proper voltages aside from the SUSPEND and SUSPEND-NOT pins. Since they're the states of an inverter input and output it's disallowed logic. Anyone seen this and know of a fix aside from replacing the CP2102? I note I had been getting strange high frequency noise on my network, it stopped around the time this went belly up.
first:
did you check the usb connector solder pins?
i had many of them with bad soldered usb connector pins...
try to resolder this 4 pins first.
or:
desolder the asic and check if it is detected.
is cp2102 getting hot?
if you desolder asic and it is detected again, you know your asic is demaged.
the cp2102 works without any external components.
i mean, if you desolder every component but keep only the cp2102 on board, it must be detected by your computer.
if not, maybe its bad soldered but mostly death cp2102.
i have some new cp2102 if you need.