LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

[ktmmotocross]

Hello have this
LENOVO g50-80 NM-a361 - Intel with AMD - that have 3.8V on 3.3ALW and VLP. i replace ic but still the same. replace FB line components not help. when pust start button it try to start but shut off after second. standby consumptioon is high 1.9W

any hint why i have 3.8V on ic ?

[mon2]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

Check the accuracy of your meter / batteries on the meter.

[ktmmotocross]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

checked. reading is ok

[mon2]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

Is the replacement part a known good and same part?

The FB parts will define the output voltage of the switching regulator but the LDO is a fixed value.

Perhaps the replacement is a different variation of the component that is designed to output these preset values?

Double check the traces for the FB leg and soldering of the regulator. Have some concerns that with such a high output, likely some damage to the downstream parts.

[ktmmotocross]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

replacement was from spare board. before and after replacement same reading. resistor have 1k and capacitor was replaced

[Sephir0th]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

If nothing helps, then maybe pictures from the are in question does

[mcplslg123]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

Standby consumption is high-Thats the clue. Check whether 3VS/5VS is transferred in standby mode. If yes, your dc-dc regulator needs to be replaced. Do check whether any voltage is generated on coils in standby mode(Other then 3V/5V/0.95V)

[ktmmotocross]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

When i remove PJ303/3.3V cut after coil/ i get nice 3.3V on coil, but 5vALW rail have still coonsumption 1.1W. something is bad on that rail

Right now i found 4.36V on bios VCC pin

that 5V rail must leaking somewhere

[ktmmotocross]

Re: LENOVO g50-80 NM-a361 - Intel with AMD - 3.8V on 3.3ALW and VLP

5vALW leaking to 3vALW so it have 4.4V, but where?