Modelell Inspiron3521
M/B-LA-9104P
Problem: PS_ID isfluctuating between 0.9V to 1.8V,Adapter Unknown. Laptop is booting fine with adapter only. Works with battery Only but doesnt charge.
Here is what i've observed and done so far.
01.Resistance on PJPDC,pin1=134K Ohms
02.PR904/900/906/905/902/903-all as per schematics(tested out of circuit)
03.PQ901-gate is stable 5V, Source /drain pulsing between 0.9V to 1.8V
04.PQ900-Collector is 5V, Base is 0.1V to 0.2V
05.Connectivity between SIO,pin16 and PD901,pin1 is intact.
06.PD901-PIn3 is 5V,Pin1 is pulsing as above.
07.No broken traces/corrosion around charging area.
08.PQ100/101-SOurce/Drain=19V,Gate=8.4V
09.PR102 is 19V.
10.I've removed PQ900/901 and jumpered PQ901 Source to Drain. Result is same. So PQ900/901 is not bad for sure.
11.PD901 is replaced,still same.
12.SIO,Main/EC bios flashed known good.
13.PL902 Is intact.
14.As a last resort,replaced SIO with anew one and flashed,Still same.
PS_ID in dell is simple circuit and always had success in resolving it. this is the first time i'm stuck and really out of ideas.
If anybody has further insights, please advise.
M/B-LA-9104P
Problem: PS_ID isfluctuating between 0.9V to 1.8V,Adapter Unknown. Laptop is booting fine with adapter only. Works with battery Only but doesnt charge.
Here is what i've observed and done so far.
01.Resistance on PJPDC,pin1=134K Ohms
02.PR904/900/906/905/902/903-all as per schematics(tested out of circuit)
03.PQ901-gate is stable 5V, Source /drain pulsing between 0.9V to 1.8V
04.PQ900-Collector is 5V, Base is 0.1V to 0.2V
05.Connectivity between SIO,pin16 and PD901,pin1 is intact.
06.PD901-PIn3 is 5V,Pin1 is pulsing as above.
07.No broken traces/corrosion around charging area.
08.PQ100/101-SOurce/Drain=19V,Gate=8.4V
09.PR102 is 19V.
10.I've removed PQ900/901 and jumpered PQ901 Source to Drain. Result is same. So PQ900/901 is not bad for sure.
11.PD901 is replaced,still same.
12.SIO,Main/EC bios flashed known good.
13.PL902 Is intact.
14.As a last resort,replaced SIO with anew one and flashed,Still same.
PS_ID in dell is simple circuit and always had success in resolving it. this is the first time i'm stuck and really out of ideas.
If anybody has further insights, please advise.
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