Costumer brought this old laptop with no power.. no led light when adapter is plug in.. just dead...
visual check.. no burnt parts fuse are all intact. mobo is clean
what i did check the
Vin 19v
B+ = 2.7v
5VALWP = 0
3.3VALWP = 0
1.8VALWP = 0
all power rail is 0 except the vin
happen to check the 2 transistors that trigger the gate of the mosfet PQ8 and PQ9
transistor PQ10 is open base open collector and emitter
transistor PQ11 is good base emitter but open base collector..
the two mosfets are good when in circuit test but i doubt.
Question is.. those 2 transistors are intact no holes or burn marks..just died
what is the problem so that i can look further for or maybe i missed something.. thanks in advance
visual check.. no burnt parts fuse are all intact. mobo is clean
what i did check the
Vin 19v
B+ = 2.7v
5VALWP = 0
3.3VALWP = 0
1.8VALWP = 0
all power rail is 0 except the vin
happen to check the 2 transistors that trigger the gate of the mosfet PQ8 and PQ9
transistor PQ10 is open base open collector and emitter
transistor PQ11 is good base emitter but open base collector..
the two mosfets are good when in circuit test but i doubt.
Question is.. those 2 transistors are intact no holes or burn marks..just died
what is the problem so that i can look further for or maybe i missed something.. thanks in advance
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