IBM THINKPAD T60 DC CHARGING CIRCUIT FAST TEST WAY

Input DC 20V (VINT20, test point 1), after power management chip U42 (MAX8765) processing, output DC 12V voltage (CHARGER_OUT12, test point 2) to charge.

Complementary push-pull circuit Q4A Q4B, opposite phase PWM  pulse signal to control mosfet (test point 3). Look at their waveform on the picture....read more

IBM THINKPAD T60 DC 1.8V 0.9V CIRCUIT FAST TEST WAY

Input DC 20V (VINT20, test point 1), after power management chip U7 (MAX8632) processing, output DC 1.8V voltage (6A VCC1R8A, test point 2).

12-Pin of U7 (MAX8632) output DC 0.9V (VCC0R9B, test point 3).

Complementary push-pull circuit Q43 Q49, opposite phase PWM  pulse signal to control mosfet (test point 4). Look at their waveform on the picture.....read more

IBM THINKPAD T60 DC 1.5V 1.05V CIRCUIT FAST TEST WAY

Power management chip U29 (MAX1540ETJ) output DC 1.5V voltage (VCC1R5M,test point 1), and DC 1.05V voltage (VCC1R05B, test point 2).

Complementary push-pull circuit, opposite phase PWM  pulse signal to control mosfet (test point 3). Look at their waveform on the picture.

U29 25-Pin control the G pole of Q14 Q90 upper mosfet, .... read more

IBM THINKPAD T60 DC3V 5V CIRCUIT FAST TEST WAY

DC 20V ( test point 1) from DC input circuit, through power management chip U41 ( MAX1901), after processing, output DC 3V(test point 2) and DC 5V(test point 3) voltage.

Complementary push-pull circuit,...read more