Brother, i Have problem with dell 3421 no power issue. Its 5v, 3v ok. I have flashed bios. but no power. SIO power 3.3v and VCC POR 3.3v ok. But Sio not release Rsm_RST. So dont know whats wrong. can any body point out this problem.
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Dell 3421, No Power.....
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Re: Dell 3421, No Power.....
Thanks everybody speacially Khaahk. I have noticed that 5v_s5 and 3.3v_s5 is not present in U3601 AND U3602. But I have a same working Motherboard this board also 5v_s5 n 3d3_s5 is not preset without power button press. But this schematic indicate 5v_s5 and 3.3v_s5 must be ok befor rsm_rst#. I dont know what happend.
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Re: Dell 3421, No Power.....
Originally posted by dj_ricoh View Postdo a reflow!
could get it on this thread.
So what happens is I got this notebook, and as soon as I plug the dc adapter the PSU light goes off. So there's a short somewhere. some guys form chip level repair told me to go straight to the VCC core section and lift all fets and check them I did that, and fets were fine.
Then I focused myself on the VIN section I lifted all fets and they were fine.
any ideas how I should go on, I'm thinking on 3v 5v always regulator and fets.
But I'm starting to think maybe the SIO could be shorted.
can you give me some ideas. Thanks. I have a lab supply to inject voltage if needed.
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Re: Dell 3421, No Power.....
Originally posted by dssence View PostHi bro I was googling around to get the schematic of this board, and I finally
could get it on this thread.
So what happens is I got this notebook, and as soon as I plug the dc adapter the PSU light goes off. So there's a short somewhere. some guys form chip level repair told me to go straight to the VCC core section and lift all fets and check them I did that, and fets were fine.
Then I focused myself on the VIN section I lifted all fets and they were fine.
any ideas how I should go on, I'm thinking on 3v 5v always regulator and fets.
But I'm starting to think maybe the SIO could be shorted.
can you give me some ideas. Thanks. I have a lab supply to inject voltage if needed.
and go like that untill you find all the bad components and the PSU does not consume anymore!Just cook it! It's already broken.
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