Mosfet chip help

[terry]

I have a 19" LCD TV/Monitor with no back light, replaced some faulty cap and the back-light chip is faulty (ME4946) I can not find anywhere I can get one, Is there a replacement I can use.

Thanks for any help

Terry

[Rtech]

Re: Mosfet chip help

Could this be it ?????
http://pdf1.alldatasheet.com/datashe...SI4946BEY.html

[terry]

Re: Mosfet chip help

Yes, look like the right one, if only I could find some sell them, everone out of stock.

[lucky13]

Re: Mosfet chip help

terry,

Please update your profile to show country or region you are at....

[lucky13]

Re: Mosfet chip help

Please also post brand & model of the unit you are repairing.

Some clear pix may help too.

Datasheet shows 2005, so it may already been discountined as new.

[MXM]

Re: Mosfet chip help

i found a dastasheet dating 2007, but still didnt manage to find a replacement, if you had to use other type of package, would you have room for that?

[Toasty]

Re: Mosfet chip help

Do some research on DigiKey & Mouser. A suitable replacement should be found. Be sure to check the block for "In Stock Items" so your not chasing a phantom.

Pay attention to:
Drain-Source voltage - Vds
Gate-Source voltage - Vgs
Continuous drain current - Id
Pulsed Drain current - Idm
Max Power Dissipation - Pd
Turn-On Delay Time - td(on)
Rise Time - tr
Turn-Off Delay Time - td(off)
Fall Time - tf

Start with voltage, current, package type (SO-8) and narrow the field.

More direct link to item from Vishay:
https://cdn.badcaps-static.com/pdfs/...de7c01f032.pdf

[Rtech]

Re: Mosfet chip help

Terry,
I have a whole load of spare Monitor boards, Logic,PSU/Inverters/front panel..etc etc.If you advise the Manufacturer and Model...may be able to help ??

[terry]

Re: Mosfet chip help

I can not find any one with SI4946BEY in stock or the ME4946. what do you think about using a Fairchild FDS3890.

Terry

[Toasty]

Re: Mosfet chip help

uk.rs-online.com has them but there's a 10 piece minimum and a £10 surcharge for amount under £100. Not the order, but for these alone. So for £17.10 plus shipping you get 10 pieces.

[terry]

Re: Mosfet chip help

I ordered 20 from RS, thay called me the day after and said there can not supply them, thay can only supply them as a special order of 2500 units.

[Toasty]

Re: Mosfet chip help

Ok. I saw that Mouser has 3300 of them on order and due in mid-September.

[ecking767]

Re: Mosfet chip help

I think the AO4826 may be a suitable replacement. but where to find this AO4826 ??? Digi-Key don't stock this chip.


http://www.aosmd.com/web/products/pr...tnumber=AO4826

[severach]

Re: Mosfet chip help

FindChips
Doesn't look good. You'd think that "status: Full Production" would make them a bit easier to find.