Re: Dell Inspiron 6400 can't turn on
I found northbridge chip become hot when i fed the voltage. So do i need to reflow or reball this chip?
gianttora
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Last Activity: 08-04-2017, 11:27 AM
Joined: 05-05-2014
Location: Selangor
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Re: Dell Inspiron 6400 can't turn on
OK. I already removed PQ42. I did a test and found this mosfet is OK. I fed voltage at PR132 with 4 volt. Voltage value is decreasing to 0.4v and ampere increase more than 2.00 A. So I lowered the Amp to 1. No component became hot this time....Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
I'm not sure whether i feed the voltage in a right way. I put black probe to the screw hole for grounding and red probe at the PC140 since you suggest to feed the voltage after the FET (PQ6). I'm doing this while PQ6 is off the board.
When i fed the voltage, regulated power supply showing the was a short occured and FET (PQ42) became so hot. So is it PQ42 is the culprit?
One more thing is my friend told me, if I want to replace faulty FET i just need to follow the last number from the FET code number. If even number...Last edited by gianttora; 08-07-2014, 06:48 AM.Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Yes i alredy tested it off board and the fet is still in good condition.
Here is the schematic
I refer to page 45.
May i know how to feed voltage after the fet ? Any reference of video which i can refer to?...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Sorry i'm not testing the mosfet. I just test the mosfet point on the motherboard....Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
When i look at the circuit diagram, I found a couple of component near the FET. I got FL2, PC22, PC20, PR16, PR21. I already did a voltage measurement without resolder the FET (PQ6) back. Here is the result.
FL2 - 18.95v, 18.95v
PC22 - 18.95v, 0.00v
PC20 - 5.59v, 18.95v
PR16 - 5.59v, 18.95v
PR21 - 0.00v, 5.59v
I also tested FET (PQ6) on motherboard
Pin 1 to Pin 3 - 18.95v
Pin 4 - 5.59v
Pin 5 to Pin 8 - 0.00v
So which one is the...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Thank you sir for replying. Do i need to test the next component without resolder the fet back? What voltage should i get when test the other component?...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Sir do you mean that i need to tune mannualy the Regulated DC Power Supply current value from 3.94A (pls refer pic in first post) to 1A. I already did that and found FET (PQ6) become extremely very hot just within a couple of second....Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
I can't find any leak caps but when i remove PQ6 and connected the mobo to power supply here is the result i get.
[URL=http://s658.photobucket.com/user/gianttora/media/WP_20140725_001.jpg.html][/URL]
Now no more components become too hot after i remove PQ6.Re: Dell Inspiron 6400 can't turn on
I can't find any leak caps but when i remove PQ6 and connected the mobo to power supply here is the result i get.
[URL=http://s658.photobucket.com/user/gianttora/media/WP_20140725_001.jpg.html][/URL]...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
I unable checking all the components u listed above because i afraid the mobo and fet (PQ6) will burnt. When connected this fet getting extremely hot within a couple of second....Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
So u mean i need to find which caps was leak on this laptop motherboard and then clean them properly? Ok i'll try to find them....Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
I am not sure which one. I can feel nearby caps is getting hot but cannot specify which is it.
Can i take out fet PQ6 from motherboard and do the voltage test. What voltage value should i get when test it ?...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Actually i'm not really sure how to test this fet. Should i connect this board to power supply and then test it. As I mentioned before when this board is connected to power supply this fet (PQ6) will become extremely hot in a short of time. I afraid it will burnt the fet and board too. So how do I test this all the component above in a right and proper way?...Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Thanks for reply,
Here is the pic of the DC regulated power supply which showing motherboard is short. My friend told when the voltage value is decrease, the current is increase and CC led is light there is short circuit on the motherboard.
[URL=http://s658.photobucket.com/user/gianttora/media/WP_20140718_001.jpg.html][/URL]
And here is the pic of the motherboard where u can see the fet (PQ6).
[URL=http://s658.photobucket.com/user/gianttora/media/Camera360_2014_7_15_044713_jpg.jpg.html][/URL]...Last edited by gianttora; 07-24-2014, 04:15 PM.Leave a comment:
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Re: Dell Inspiron 6400 can't turn on
Anyone please help
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Dell Inspiron 6400 can't turn on
Hello everyone,
I got Dell Inspiron 6400 from my friend. This laptop can't turn on. When i connected this motherboard to dc power supply it shows that voltage is decreasing and current is increasing. CC indicator also light up, so i think there is a short circuit on this motherboard.
One more thing is, fet (PQ6) is heating up so fast and extremely very hot. So i try to change the fet but the result still the same. Anybody can help me to solve this problem.Last edited by gianttora; 07-24-2014, 12:05 AM. -
new member and newbie in electronics here
Hello everyone,
I am really noob when it comes to troubleshoot electronics issues but I really want to learn the skills especially repairing notebook and lcd monitor. I hope experts in this forum would gladly helping me.
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