Mobile phone charging, the press "on" current of 10 ma, left and right sides. vtSservice manual download site
 vtSservice manual download site
Current below 15 ma CPU didn't work properly. Common cause the CPU will not work for 13 MHZ master clock signal problems, whether there is a few CPU power supply in place. We according to the test current, the first 13 MHZ system clock signal detection, tested 13 MHZ clock signal output, CPU (4) feet or 3 v power supply. 13 MHZ power supply is provided by the rf circuit voltage stability U105, the regulator tube to five feet components: one (1) the foot after VBATT power supply; (2) feet ground; For the POWER control (3) the feet, high efficient; Is empty (4) the feet; 5 foot 3 v voltage, mainly to provide 13 MHZ 3 v voltage. Via detecting U105 5 feet voltage of 0 v. vtSservice manual download site
 vtSservice manual download site
 vtSservice manual download site
There are two solutions: one is changing; Another is the absence of parts by means of radio frequency power supply at the foot of the tube U107 (5) for 13 MHZ, premise is to remove the U105 first, and then fly in U107 5 feet A pick up line to U105 5 feet. U105 or replaced.vtSservice manual download site