There are no fuses on the motherboard.
The X4701 may be a Macom RF Power MOSFET, and will probably be located close to the X4701 designation, silkscreened on the motherboard.
Doesn't EVEN look like a fuse.
This is a general example of a Power MOSFET,https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg
Notice the J-leads on the sides.
I wonder if you are looking at a crystal diode, or an MLCC ceramic capacitor, (Multi Layer Ceramic Capacitor, and is SMD. Surface Mount Device)http://www.magnaquartz.com/wp-content/uploads/2011/05/crystal-diode.jpghttp://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrkiZ1z0t6fg
At any rate let's look at a Satellite C655D series of Notebook PC's motherboard,http://www.ebay.com/itm/Toshiba-Satellite-C655-Intel-Motherboard-V000225020-1310A2355302-/251167301769?pt=Motherboards&hash=item3a7abce089
Under the large main views are small views.
The view to the far left is the Bottom side.
The third view from the Left is the Top side.
You have to click on each one, one at a time, then you can use the Zoom In feature for that view.
Using the Zoom feature, can you try to point out the electronic component?
Use a reference point we can both follow. State a known large component near it, and go from there.
You know what the processor socket, and graphics chipset is. They are covered by the Cooling Tube.
You know what Power MOSFETs look like now, and Ceramic Capacitors.
The small aluminum 'can's that have a purple mark on one side, are solid Polymer capacitors. (Doubt they are Tantalum)
Also, I realize that it gives one a sense of pride to repair a motherboard, and the cost of the electronic components are MUCH cheaper than buying a replacement motherboard, but a replacement may be the way to go.
(Fairchild Semiconductor International - FDS6679 - Power MOSFET is around $1.
Ceramic capacitors, (MLCC, and SMD), are around 60 to 82 cents.
From the Ebay link it looks like $39 to replace the motherboard)
Capacitor failure? Ehh. No problem if we're talking SMD MLCC ceramic capacitors.
Diode goes bad? Could led to power going to the wrong place, and other electronic components could have been affected.
Could be bad, or about to go bad.
This would mean motherboard replacement is the more logical solution, IMHO.
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