Hi Guys! How are you?
I´m trying to fix Dell´s Vostro 3450 motherboard model Dav02amb8f1 with VGA ATI.
My note was working well and then suddenly it turned off. When I tried to power it on again it started to shut down ac adaptor.
I did a circuitry analysis on motherboard and I discovered mosfet PQ 36 was shorted. I swap this mosfet and AC Adaptor stopped to being turn off. Nice! I thought that problem was fixed but my board still not working. Any sign of turn on sequence is noted now.
I´m using adjustable font to feed it and I discovered now mosfet channel P named pq31 has 0 V in gate and 19 V on drain and source.
https://photos.app.goo.gl/i7hAubRFpbQSRm9R6
I really don´t know what next step to verify on this board. I don´t know exactly why PQ31´s gate has 0V and if it is correct or if it must have about 3 V to turn this board on.
Does it ACAV_IN is signing OK to PQ3? What is the logic behind ACAV_IN? Is it a way to short to ground to avoid damages?
You can check schematic PQ31 belongs on page 44.
I´ve checked U1 VCC and it has a correcct tension?
Could anyone help me to solve this problem?
https://cdn.badcaps-static.com/pdfs/...e6e012530e.pdf
I´m trying to fix Dell´s Vostro 3450 motherboard model Dav02amb8f1 with VGA ATI.
My note was working well and then suddenly it turned off. When I tried to power it on again it started to shut down ac adaptor.
I did a circuitry analysis on motherboard and I discovered mosfet PQ 36 was shorted. I swap this mosfet and AC Adaptor stopped to being turn off. Nice! I thought that problem was fixed but my board still not working. Any sign of turn on sequence is noted now.
I´m using adjustable font to feed it and I discovered now mosfet channel P named pq31 has 0 V in gate and 19 V on drain and source.
https://photos.app.goo.gl/i7hAubRFpbQSRm9R6
I really don´t know what next step to verify on this board. I don´t know exactly why PQ31´s gate has 0V and if it is correct or if it must have about 3 V to turn this board on.
Does it ACAV_IN is signing OK to PQ3? What is the logic behind ACAV_IN? Is it a way to short to ground to avoid damages?
You can check schematic PQ31 belongs on page 44.
I´ve checked U1 VCC and it has a correcct tension?
Could anyone help me to solve this problem?
https://cdn.badcaps-static.com/pdfs/...e6e012530e.pdf
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