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Help me identify this part

 
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PostPosted: Sat Apr 26, 2008 10:40 pm    Post subject: Help me identify this part Reply with quote

Hello,

I am trying to repair a Westinghouse LCD monitor with a non-functioning backlight. I'm fairly certain I've identified the part that needs to be replaced, but I can't find a source. It is a small rectangular black chip that looks similar to an IC. It has four legs on two sides (eight total). There are two of these chips, apparently one per CFL backlight based on the board layout. I've been told it may be an optic isolator or some type of voltage regulator. Here is the number stamped on the top of the chip:

P605
BD7B12

I would appreciate any advice, whether it be on what this part is exactly or where I can get a new one. Thanks!
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sun Apr 27, 2008 2:30 am    Post subject: Reply with quote

Too broad of a number--may be a house part number? Is there any logo on the IC package?

... it may be some sort of a driver or perhaps dual FET drivers?

You may have better luck in finding the inverter (complete) rather than sourcing individual components.
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BAMF



Joined: 26 Apr 2008
Posts: 4

PostPosted: Mon Apr 28, 2008 8:34 am    Post subject: Reply with quote

Hey, thanks for your help. It does have a manufacturer's logo- it is a stylized 'A' inside of a circle. I did find a source for the whole board, but it is ~$100 so I thought I'd give this a try first. I'll try to get a pic up. Hopefully my login will work, my first post displayed as 'Guest.'
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BAMF



Joined: 26 Apr 2008
Posts: 4

PostPosted: Mon Apr 28, 2008 11:25 pm    Post subject: Reply with quote

Pic:

<a href="http://s219.photobucket.com/albums/cc179/JaxACR/?action=view&current=chip.jpg" target="_blank"><img src="http://i219.photobucket.com/albums/cc179/JaxACR/chip.jpg" border="0" alt="Unknown chip"></a>
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BAMF



Joined: 26 Apr 2008
Posts: 4

PostPosted: Mon Apr 28, 2008 11:26 pm    Post subject: Reply with quote

Err, one more time:

http://i219.photobucket.com/albums/cc179/JaxACR/chip.jpg
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Tue Apr 29, 2008 6:21 am    Post subject: Reply with quote



Aha, I see the logo & I was not too far off Smile

The logo belongs to an outfit called Alpha&Omega semiconductor LTD
www.a0smd.com

Your actuall part number is: AOP605 & is in fact a dual Mosfet in a DIP package.

Data >>http://www.aosmd.com/pdfs/datasheet/AOP605.pdf

.. how to get one is probably another story by itself? Also there is a possibility of other problems causing it to oveheat?
---good luck
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BAMF



Joined: 26 Apr 2008
Posts: 4

PostPosted: Mon May 05, 2008 11:12 pm    Post subject: Reply with quote

Thank you so much for your help vtech! I'm sorry I haven't replied sooner, I've been out of town for the past few days. Anyway, I appreciate it!
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