Nokia 3110c Contact Service Caused by Sleepx Solution

Nokia 3110c contact service.., but all security test is valid ( imei, simlock, superdongle key )

When do selftest, and the result is sleep_x_loop failed. it seems to be a hardware problem.


sleep x is the voltage that distributed by RETU / Primary Power IC to TAHVO / secondary power IC
 and RAPGSM / CPU IC.


That's mean there is 3 possibility, between RETU IC, TAHVO IC and CPU IC.

In this / my case, the problem solved by replacing TAHVO IC.

If you are expert, you should measure connections between RETU, TAHVO and RAPGSM IC track / ways, also you should measure sleep x voltage at Junctions ( J2219 ) must be 1.8V.