acer aspire nitro an515-54 missing 3v

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

Yes, this part but the other meter lead should be on the other side of this coil. We want to know the resistance of this component.

This is a shielded coil and the coil is based on many turns of wire inside the shield. Want to confirm that the coil is not damaged.

this is okay right?



both probe on this PL301 coil

[mon2]

Re: acer aspire nitro an515-54 missing 3v

Yes, this part but the other meter lead should be on the other side of this coil. We want to know the resistance of this component.

This is a shielded coil and the coil is based on many turns of wire inside the shield. Want to confirm that the coil is not damaged.

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

No. Meter in resistance mode. No power to the logic board.

One meter probe on one side of PL301. Other meter probe on other side of PL301.

What is the resistance?

this one sir...8kOhm

[mon2]

Re: acer aspire nitro an515-54 missing 3v

No. Meter in resistance mode. No power to the logic board.

One meter probe on one side of PL301. Other meter probe on other side of PL301.

What is the resistance?

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

Wow. Quite the game.

Remove all power. Meter in resistance mode. Check the resistance across the PL301 contacts.

What is the measurement?

do you mean check all resistance on this part?

[mon2]

Re: acer aspire nitro an515-54 missing 3v

Wow. Quite the game.

Remove all power. Meter in resistance mode. Check the resistance across the PL301 contacts.

What is the measurement?

[mon2]

Re: acer aspire nitro an515-54 missing 3v

Good reading at 8k34 ohms. That is not a short. The regulator should be on. Will review the details of this regulator deeper after the soccer game. Fairly sure it is active high enable which you have.

Post close up pics of this regulator and parts. Any burnt looking parts in this region?

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

The meter has 3 functions in the yellow setting.

You are currently in DIODE mode. Press the yellow button till you see the greek symbol OMEGA for the resistance scale.

Then take your measurement again.

sorry my bad...this one?

[mon2]

Re: acer aspire nitro an515-54 missing 3v

The meter has 3 functions in the yellow setting.

You are currently in DIODE mode. Press the yellow button till you see the greek symbol OMEGA for the resistance scale.

Then take your measurement again.

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

in DC volts mode, no voltage reading at all on PL301

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

Can you double check this? Resistance checks will be with no power, meter in resistance mode.

One meter probe on PL301, other meter probe to ground.

Resistance will be in ohms. If you read '1' or 'OL', then the meter scale is too low. Select the next higher scale on the meter till you have a reading.

After the above, meter in DC volts mode (10 volts or higher). Then check the voltage to ground of PL301.

What is the measurement?

am i right?



i only have this multimeter

[mon2]

Re: acer aspire nitro an515-54 missing 3v

PL301 resistance read 0.348v

Can you double check this? Resistance checks will be with no power, meter in resistance mode.

One meter probe on PL301, other meter probe to ground.

Resistance will be in ohms. If you read '1' or 'OL', then the meter scale is too low. Select the next higher scale on the meter till you have a reading.

After the above, meter in DC volts mode (10 volts or higher). Then check the voltage to ground of PL301.

What is the measurement?

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

reading on all part that link with PL301 is normal...accept PR305 that should be 100k but only read 89k...is that okay?

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

Check the resistance of the parts and reflow these parts at the output stage of this regulator that link with PL301.

Compare the resistance values against the schematic values.

The LDO working is a good start. The switching regulator leg of the regulator should be on as well.

With no power, measure the resistance to ground again of PL301. What is the reading?

PL301 resistance read 0.348v sir

[mon2]

Re: acer aspire nitro an515-54 missing 3v

Check the resistance of the parts and reflow these parts at the output stage of this regulator that link with PL301.

Compare the resistance values against the schematic values.

The LDO working is a good start. The switching regulator leg of the regulator should be on as well.

With no power, measure the resistance to ground again of PL301. What is the reading?

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

1) is the replacement part a known good part?

2) same part number as the original?

3) what is the voltage to ground of the LDO rail on this regulator?

4) confirm the soldering with lots of flux, enough hot air and air pressure to make this part swim and naturally rest onto the pads. When the solder is in liquid state, gently push the IC at the corners and the IC will push away and return back onto the pads. This process will fix any potential solder shorts. Then allow it to cool and test again.

5) if the parts on this regulator circuit are not missing, the voltage should be present if the solder blob is removed. That is, a no load should allow for the proper voltage output.

1) yes, new ic

2) yes same with original part

3) LDO on pin 17 got 3.3v

4) yes everything good

[mon2]

Re: acer aspire nitro an515-54 missing 3v

1) is the replacement part a known good part?

2) same part number as the original?

3) what is the voltage to ground of the LDO rail on this regulator?

4) confirm the soldering with lots of flux, enough hot air and air pressure to make this part swim and naturally rest onto the pads. When the solder is in liquid state, gently push the IC at the corners and the IC will push away and return back onto the pads. This process will fix any potential solder shorts. Then allow it to cool and test again.

5) if the parts on this regulator circuit are not missing, the voltage should be present if the solder blob is removed. That is, a no load should allow for the proper voltage output.

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

See attached.

Post your voltage reading to ground after the short / solder blob is removed.

no reading on +3VALWP (pin 1) sir

[mon2]

Re: acer aspire nitro an515-54 missing 3v

See attached.

Post your voltage reading to ground after the short / solder blob is removed.

[dqtech]

Re: acer aspire nitro an515-54 missing 3v

19V is reaching the IN pins on PU301 ?

What is the resistance to ground of the LDO and 3VALWP ?

If the readings are not low, then PU301 is defective and should be replaced.

When shopping for a replacement (recommend Hong Ming on Aliexpress - they have been good for our past purchases) - be sure to share the full part #. Often the suffix of the part number will define the enable pin logic levels, etc.

update....i already replace PU301 with new ic but also not work...3valwp not present