No back-light, need schematics to trouble-shoot!

We took apart a Sony VAIO VGN-SZ780 to fix a broken fan and ended up with no back-light. The usual suspects on the logic board seem to be OK, but can't be sure without the schematics to properly troubleshoot the back-light circuit.

Would greatly appreciate if someone has any hints on where to get my hands on the schematics or can share them.

TIA!

EDIT April 4:

Board identifiers: 1-874-192012 and MBX-170

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Rany any motherboard identifiers?

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I'm unfamiliar with Vaio boards and couldn't find them. I'll look again today. Thanks!

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@oldturkey03 I found the board identifier and added it to the question. TIA!

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@rany, check this schematic. It's for the SZ series and also slightly different than the MBX170 it should still cover your troubleshooting. Sony-VGN-SZ.pdf

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Rany will be eternally grateful.
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