Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
I placed PQ31 better and it´s gate now provide 1,8 V. But now I think PU1 is damaged. It is heating and PR25 is hot too. It is connected to pin 22 (DC In).
I think I need to replace PU1 too. Any considerations about it?...
alan_aguinaga
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Last Activity: 06-17-2019, 11:20 AM
Joined: 06-07-2019
Location: rio de janeiro
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Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
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I will do this tests on those pins later but a have same impressions about soldering on PQ31 cause it is too complicated to reach.
Both of you are correct. He gives me a right clue about tension on pins 27 and 28.
I tested PQ31 outside board before soldering it back again and now pin 4 (gate) has 19 v. It means exactly what you said. It is shortened. I will replace it later and give you feedback....Leave a comment:
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Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
on power sw I got 2,35 on pin 2 and 3Leave a comment:
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Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
Teste the Voltage on all pins of PU1 charging IC
[URL="https://photos.app.goo.gl/G8PkNCrjKNkBxVqJ8"]https://photos.app.goo.gl/G8PkNCrjKNkBxVqJ8[/URL]
PQ31 Gate must be +3 to +10V to bypass the voltage
gate pin 4 - 0,00 V
PQ3 FET pin 2 must be active high to pin 1&3 go GND ,
PQ3 gate 3 v, source e drain 0 V
Two resistors connected to that line PR13/14 is your...
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Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
I´ll do that ASAP. thanx! I´ll give you feedback later....Leave a comment:
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Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
Yes, I´m getting 19 V from both sides. But 0,01 V on pin4 (gate)...Leave a comment:
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dell vostro 3450 was turning off ac adaptor. I fixed it but it can´t turn on yet
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...Last edited by alan_aguinaga; 06-11-2019, 08:34 AM. -
Re: New Members - please post your introductions here
HI guys I´m Alan
I´m from Brazil. I have a lot of experience on Hardware and Networking for about 25 years. I´m a teacher on Brazilian tech school called SENAI in Rio de Janeiro.
I´m interested to learn more about fix laptop motherboards.
I hope to give and receive help in some issues from here.
So I hope to bypass spam system is my first quest
CheersLeave a comment:
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