[SOLVED]820-3115 no power, intermittent green light

Jay

Member
Liquid damaged board, replaced U7200 and surrounding components. All measurements as they should be. Checked unwire circuit and PP3V42, SMC_BC_AOK are present. Power draw on PSU 0.019 - 0.025.

PPBUS_G3H = 12.6V
PPBUS_S5_HS_COMPUTING_ISNS = 12.6V
PPBUS_S5_HS_OTHER_ISNS = 12.6V
PPDCIN_G3H = 16.09 - 16.13 fluctuating (0L to ground at C7031)
PP3V42_G3H = 3.4V
PPVRTC_G3H = 3.39 - 3.44V fluctuating
PP5V_S5 = 3.80 - 4.65, occasionally 5V, fluctuating constantly.

200K-ohm to ground on PP5V_S5. Before I start injecting I feel like I'm missing something... Any feedback appreciated :)
 

Jay

Member
Fount a broken trace above U7200. Restored it and unit is now powering on. This can be marked as solved, thanks Duke.
 
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