Check the resistance to ground of PPVOUT_S0_LCDBKLT (red meter probe) & black meter probe to ground. Checking for a low resistance which can cause this rail to be pulled down OR even shut off due to an excessive load (current draw).
Meter in resistance mode. Check the resistance to ground on PPVOUT_S0_LCDBKLT.
Is it very low in resistance? If yes, then this needs to be fixed.
If resistance reading is high then proceed to power on and check if the voltage of PPVOUT_S0_LCDBKLT is high enough to light up the LEDs in the display.
Voltage of PPVOUT_S0_LCDBKLT ?
If low voltage on PPVOUT_S0_LCDBKLT then check if the backlight IC is being ENABLED.
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