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820-2850 no green light no PP3V42_G3H
- Thread starter stephsa
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please
Pin 3 is the VIN, voltage in pin. We expect here DC in voltage or battery voltage. The battery is 11-12v, the DC in voltage should be 16v.
PPDCIN_G3H_OR_PBUS goes through R6990 to send 16v to the voltage in pin. It also goes through R6993 to enable the chip to turn on.
Since pin 2 is 16v, I can assume that PPDCIN_G3H_OR_PBUS is present.
Since pin 3 is 3v, I can assume that either one of two things is true.
1) C6990 is short circuiting pin 3 of U6990 to ground.
2) R6990 is blown.
It is possible both of the above are true. What is the resistance of R6990? What is the resistance to ground at pin 3 of U6990? Measure without power applied of course.
PPDCIN_G3H_OR_PBUS goes through R6990 to send 16v to the voltage in pin. It also goes through R6993 to enable the chip to turn on.
Since pin 2 is 16v, I can assume that PPDCIN_G3H_OR_PBUS is present.
Since pin 3 is 3v, I can assume that either one of two things is true.
1) C6990 is short circuiting pin 3 of U6990 to ground.
2) R6990 is blown.
It is possible both of the above are true. What is the resistance of R6990? What is the resistance to ground at pin 3 of U6990? Measure without power applied of course.
1) What voltage is PPBUS_G3H?
2) If you measure the list of rails on page 7 of the schematic, what rails are present? What rails are missing?
Does PM_SLP_S4_L pulse when you plug in the charger?
3) Are you using an original 85w charger?
2) If you measure the list of rails on page 7 of the schematic, what rails are present? What rails are missing?
Does PM_SLP_S4_L pulse when you plug in the charger?
3) Are you using an original 85w charger?