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I did a jumper to U6101 as 3V was missing and now they are stable always. Do you think replacing SMC will solve the problem with no video or this is another problem? I have all rails and CPU rail appear for 20 seconds and then goes to 0V. Any idea here?
This board work well with battery and show 29%-28% and goes low.
Only with adapter ppbus - 0V. No short there.
pin17-18 and 27-28 are 3 and 20 ohm.
VDD on ISL6259 are 5V
acok - 3.3V
Next step is to replace ISL6259?
This Macbook pro has this problem: http://static.yoreparo.com/imagenes/subidas/1760763-Captura.PNG
I replaced HDD and hdd cable 2 times. Mostly it works, but sometimes appears this circle. What I can try more?
This is not Macbook. This is Dell, but if somebody know the problem. Start with no video, but if I plug external monitor and unplug, then video appear on lvds. Any idea?
No power cycling. Cannot see nothing on S4 rail. traces and resistors are ok. Only chip Select (/CS) on BIOS pin 1 is in 0.30V sometimes goes to 1V
Should be on 0V or 3V?
Found little corrosion arround Bios
PP3V3_S5 - present
32khz PCH present
PM_PWRBTN_L -3V
PM_RSMRST_L -3V
PPVRTC_G3H -3V
RTC_RESET_L -3V
PM_SLP_S5_ L -0V
PP5V_S4 - 0V missing
Checked resistor arround bios and are ok. Corrosion was very very little.
I lift U6101 and clean and resolder again...
820-3115
I have 1.05, 0.9V, 1.50V stable but missing PPVCORE_S0_CPU
All_SYS_PWRGD is present - 3.24V
When All_SYS_PWRGD is present that mean all is ok except cpu core??