Author Topic: Samsung 64in Plasma Power Supply Repair  (Read 801 times)

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Offline Basstrom

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Samsung 64in Plasma Power Supply Repair
« on: October 10, 2018, 12:12:41 am »
Hi all,

First time poster here.

I've got a Samsung 64in Plasma TV that the power supply board has died in it (something common with these  ::) ). In my research of what actually fails I've found that the MOSFET's on the power factor correction circuit (this I'm guessing from similar boards and proximity of the MOSFETs to the 400V caps).

The part number for the MOSFETs on my particular board are K18A60V. A quick google search and hunting on Digikey and Element14 reveals that these are obsolete or I can get cheap "wun-hung-lo" parts from Aliexpress / eBay, I'd rather pay extra so it doesn't fry the rest of the TV.

So... my question is, how do I go about finding a suitable replacement?
From the datasheet I was able to find it has the following characteristics
N Channel
Vds - 600V
Id - 18A
Rds On - 190mOhms
Vgs - 30V
Pd - 45W
Package - TO-220

I can't find something that meets the exact same specifications, unless I'm not searching correctly on Digikey / element14.
What characteristics can I be more "lenient" on, ie could I use one with an Id of 20A instead or Vds being 650V?
 

Offline coromonadalix

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Re: Samsung 64in Plasma Power Supply Repair
« Reply #1 on: October 10, 2018, 01:38:35 am »
The only one ive found:    sure there maybe other equivalents, the 600v is the determining / choosing factor

You could search in the 2SK series, IRF series  ....


Manufacturer:  IXYS
                                                 PD   VDS  VGS  VGS(th)         ID       TJ     TR     CD         RDS          Case
IXFP22N65X2  N    MOSFET    390    650    30    5.5                22    150    35    1530    0.16    TO220AB
IXFP24N60X    N    MOSFET    400    600    30    4.5                24    150    29    1400    0.175    TO220AB
IXTP32N65X    N    MOSFET    500    650    30    5.5                32    150    49    1600    0.135    TO220AB <-------------------------------------- this one is the winner

Mouser  sell these's, not sure you have it in your country ?   around 6$ usd

https://www.mouser.com/ProductDetail/IXYS/IXTP32N65X?qs=O0OZL7qk7VFfC1DWhVylYw==


EDIT
FOUND THIS SEARCH TOOL : http://uk.rs-online.com/web/c/semiconductors/discrete-semiconductors/mosfet-transistors/?searchTerm=mosfet
« Last Edit: October 10, 2018, 01:58:54 am by coromonadalix »
 

Offline Basstrom

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  • Country: au
Re: Samsung 64in Plasma Power Supply Repair
« Reply #2 on: October 10, 2018, 07:35:07 am »
Thanks for that mate.

One thing I noticed when taking off the old parts, there is no metal pad on the back, so I'm guessing they're electrically isolated from the heat sink as they are both mounted on the same heat sink with a 2206 Twin diode in the same package.

Would these be suitable instead?
https://docs-emea.rs-online.com/webdocs/1670/0900766b8167035e.pdf
 

Offline coromonadalix

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Re: Samsung 64in Plasma Power Supply Repair
« Reply #3 on: October 10, 2018, 10:09:12 am »
I think they can do
 

Offline Basstrom

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  • Posts: 4
  • Country: au
Re: Samsung 64in Plasma Power Supply Repair
« Reply #4 on: October 11, 2018, 07:38:59 am »
Cheers,

I ended up getting another brand new board in the mean time, but considering the failure rate of these boards based on google searches I'll keep the old one and fix it up.

Thanks again for your help  :)
 


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