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I have a Atari lynx with a bad mosfet. I have connected the negative connected to the headphone, powering it on, but the picture is very light. How do I fix this?

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  • Daniel trombetta Oct 30, 2012

    just to clarify, the problem I'm having is with the picture, not the power. The picture is too light, even with the backlight set all the way down. It apperars there is some corrosion on one of the twin capacitors below the mosfet. Could that be affecting the picture?

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1) http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

2) http://www.aosmd.com/res/news/news-article-1343753118301/AON6290_PR.pdf

3) http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

4) http://www.dfsales.com/mark/displayresults2.asp?partnumber=AO4407

A) Of course check the output of the AC adapter (Charger), FIRST.
You're looking for 18.5 Volts (DC) at the output plug of the AC adapter.

[Center hole of plug is Positive. Outer cylindrical metal shell is the Negative connection ]

B) Next check the DC Power Jack. (The jack on the laptop where the AC adapter plugs into)

With the Battery removed, see if you can wiggle the center pin of the jack.

Any perceptible movement means a problem with the DC Power Jack.
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http://www.amazon.com/DDAT8APB3001108-DDAT8APB2002408-DV6000-V6000-power/dp/B004ETK3RS

AC adapter checks out, DC Power Jack checks out, check the two Power MOSFET's listed at the start of this solution.
[FDS6679 and AO4407]

MOSFET,

http://en.wikipedia.org/wiki/MOSFET

Power MOSFET,

http://en.wikipedia.org/wiki/Power_MOSFET

Now let's talk. See how the FDS6679 and AO4407 use the D2PAK surface mount?

http://en.wikipedia.org/wiki/File:D2PAK.JPG

They use J-leads for connection. The J shaped flat leads that come out of the body of the P.MOSFET. In the above example there are two.
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Talk about easy to unsolder, and solder.
Just make sure when installing the new one/s you use a Clip Heatsink on each J-lead, as you solder each J-lead to the motherboard.

http://www.radioshack.com/product/index.jsp?productId=2103242

Use Desoldering Braid, (Solder Wick), to remove solder.
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To conclude:

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You replace?
FOUR DOLLARS AND FIFTY CENTS, plus shipping, and tax.

Shop?
$100 to $125

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You replace?
Cost of .032 Rosin core solder, rosin flux, small flux brush, 25 Watt soldering iron with No.2 chisel tip, Desoldering Braid, and P.MOSFET/s.

It's One Dollar and 1 cent, for a FDS6679 from Mouser, plus shipping, and tax.

It's about $70 to $150 for a motherboard, depending on where you buy it.
And that isn't including the $125, or so for labor.

(Very few real techs left. Instead of diagnosing, and replacing those cheap P.MOSFET's, they would rather sell you a motherboard.
Easier for ***** in a repair shop with little to no skills, and also more coins, $$$$$$$)

That's my summer vacation, and now back to you David............

For additional questions please post in a Comment.
Regards,
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Hello!

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hpe this help,
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