820-3435-B, corrosion damage to u7600 area, r7630 blown and replaced, computer now gets fan spin, however no cpu vcore, and pp1v05 is 0.4v, replaced u7600, checked r7611 and r7612.
Replaced q7630 and l7630. pp1v05 remains 0.4v.
I'm lost, have checked every component in the 1.05v s0 regulator circuit, feel like I'm missing something obvious.
u7600
p1v05s0_vtt - 0.800v
pp1v05_s0 - 0.429
p1v05s0_vttref - 0.750v
pp1v05_s0_vref - 0.250v
pp1v05_s0 _fb- 0.160v
pp1v05_s0_vbst - 1.2v-1.8v
Where to next?
Replaced q7630 and l7630. pp1v05 remains 0.4v.
I'm lost, have checked every component in the 1.05v s0 regulator circuit, feel like I'm missing something obvious.
u7600
p1v05s0_vtt - 0.800v
pp1v05_s0 - 0.429
p1v05s0_vttref - 0.750v
pp1v05_s0_vref - 0.250v
pp1v05_s0 _fb- 0.160v
pp1v05_s0_vbst - 1.2v-1.8v
Where to next?