Hello, everyone!
I have an 820-00138-A motherboard that doesn't seem to be outputting PPVOUT_S0_LCDBKLT properly. I've done some poking around, and I suspect that Q7706 isn't working properly. It's a P-Channel MOSFET, so it should let PPBUS_SW_LCDBKLT_PWR (which reads 12.56V) if LCDBKLT_EN_L (which reads 12.46V) is lower, but PPBUS_SW_BKL reads a solid 0V.
I just wanted to confirm my suspicions before I went ahead and tried replacing this chip. Is assuming that Q7706 is not working a proper assumption?
Thanks!
(I've attached schematics and boardview for reference, please note that the boardview is for a slightly different model, as the boardview for 820-00138-A is not available at this time)
I have an 820-00138-A motherboard that doesn't seem to be outputting PPVOUT_S0_LCDBKLT properly. I've done some poking around, and I suspect that Q7706 isn't working properly. It's a P-Channel MOSFET, so it should let PPBUS_SW_LCDBKLT_PWR (which reads 12.56V) if LCDBKLT_EN_L (which reads 12.46V) is lower, but PPBUS_SW_BKL reads a solid 0V.
I just wanted to confirm my suspicions before I went ahead and tried replacing this chip. Is assuming that Q7706 is not working a proper assumption?
Thanks!
(I've attached schematics and boardview for reference, please note that the boardview is for a slightly different model, as the boardview for 820-00138-A is not available at this time)
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