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Old 07-17-2021, 10:11 AM   #21
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Default Re: HP 15-dk LA-H462P - 5 long 3 short caps blinks.

Originally Posted by SMDFlea View Post
The part marked CGT is an ON Semi NCP81253MNTBG

See page 91 in the LA-H501P schematic
Thank you!

I put together an overview to try and best cover everything I am seeing. Hopefully this can help explain what is going on because I know there is a lot of info here. See attached pic:

I don't know enough about this stuff to figure out if the NCP81215 controller isn't enabling the ON Semi NCP81253MNTBG or if it's the other way around.

The ON Semi NCP81253MNTBG has no enable pin (386mV) and neither does the NCP81215 (0V). It seems to me, the NCP81215 needs to be fully functional to enable the NCP81253MNTBG so it can drive high and low to the dual channel mosfet which provides the power to the coil for VCCSA?

Take a look at this pic and see if anything stands out. I'm still a bit new to this sort of stuff.
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