ACER V5-471G laptop does not boot share

An acer V5-471G notebook can not start up, connect the dc power supply, the standby current 0.006A, press the power button, the current up to 0.02A, Keep 2 seconds, then return to 0.006A, the power led does not light. Open the laptop, check the operating conditions for RT8223, VIN 19V, test 3.3V_AUX_S5, 5V_AUX_S5, both ok, 3.3V_PWR and 5V_PWR have not voltage. So check timing sequence.

Several signal must come out before 3V\5V comes, test +3.3V_RTC_LDO it is  3.3V, +RTC_VCC it is 3.3V, +PWR_SRC it is 19V, they are normal. Test S5_ENABLE, the voltage is 0V. .... read more

NEW AMD 215-0804026 BGA Chipset

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Lenovo Y470 does not display share

A Lenovo Y470 laptop, it can start, but doesn’t display. The version : LA-6881P. Connect power supply, the standby current 0.018A, press the power button to start up, the current is 0.088A, it does not display.

 

Open the notebook, start up, test +5VALW +3VALW, all are ok. Then test PL501　+1.5VP, OK. But test +5VS, +3VS, they are 0V voltage, So check the 4-pin of U46, the voltage is 0V, too. Then check the G pole of Q99, the SUSP is 0V, It is normal. So check the D pole, the +VSB is 0V, it is not normal.... read more

1pcs UP0109P SOP8 Power Management IC

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VT6656 CD TQFP-128 IC

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VIA VT6105 CD QFP IC

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VT6104 QFP IC

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