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Can i use 10nf3k ceramic capacitor to replace10pf3k ?

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Hi Max,

Ceramic types are often found at the low range of capacitive values and electrolytic types are are the high end of capacitive values. Ceramic and electrolytic caps do certain jobs better when of one design instead of the other. The capacitive values may be the same, but there are other qualities that don't get printed on the part. One of the most noticeable differences is that electrolytic types don't do a very good job passing radio frequencies (RF). You'll often see several ceramic types in parallel (if needed) to get the correct amount of capacitance when a single electrolytic would appear to do the job in an circuit where the frequency is in the RF range. Audio Frequencies (AF) on the other hand are significantly lower and do not pose the same problem. There are other types of caps and they each have situations where they would do the best job.

In short, the developer / manufacturer selects all the parts based on a wide range of variables he needs to control based on design and testing. You should always replace components with like components, otherwise you risk adverse reaction(s) from one of those variables that had originally been contained.

Click the link below for some basic info about caps:

http://dev.emcelettronica.com/guide-to-capacitors-electrolytic-capacitor-ceramic-capacitor-and-others

I hope this was helpful & good luck!

Posted on Nov 05, 2012

  • max perron Nov 07, 2012

    Thankyou for the info and web link

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Can i use 10nf3k capacitor to replace 10pf3k?


No the NF and F capacitors are alot of difference in their ratings. You should be able to get the proper capacitor by contacying the guys over at www.tvrepairworld.com

Nov 05, 2012 | Televison & Video

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I had a HP dv7-4165dx laptop that does not turn on I replaced the power socket because it wasn't working. And the power switch because I thought that was wrong with it. But still it does not turn on....


With these replaced;

1) http://www.amazon.com/Genuine-Harness-Pavilion-DV7-4000-Series/dp/B008LDTVJ4/ref=sr_1_9?ie=UTF8&qid=1350516570&sr=8-9&keywords=dv7-4165dx

2) http://www.amazon.com/Hp-Power-Button-Board/dp/B0045719EK

,and the AC adapter producing 19 Volts, with no fluctuation on the multimeter, when you wiggle the power cord TO AC adapter, and cable from AC adapter to DC Power Jack;

The problem is Power MOSFETs in the motherboard power section, and/or ceramic capacitors.
(MLCC ceramic capacitors)

Showing average price of Power MOSFET used in this type of application, and using a Fairchild Semiconductor - FDS6679 -
for an example,

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


Scroll down. 1 each = $1.01

Average price of MLCC SMD ceramic capacitor,

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrk9Z1z0t6fg


http://www.youtube.com/watch?v=3NN7UGWYmBY


http://www.youtube.com/watch?v=f_yFDpSTfao

http://www.youtube.com/watch?v=MqivHi7Qjvk


For additional questions please post in a Comment.

Regards,
joecoolvette


Oct 17, 2012 | Computers & Internet

1 Answer

Toshiba satellite c655d motherboard componet x4701 blown


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.jpg

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrkiZ1z0t6fg

(Scroll down)

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.
Jus sayin'.

This would mean motherboard replacement is the more logical solution, IMHO.
Post back in a Comment.

Regards,
joecoolvette

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