Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
i disconnect every time for measure resistence
i disconnect every time for measure resistence
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
so these voltages are fine. now check resistance on PL710 and PQ302 relative to GND.
I think it is time to replace a new PQ304 now.Last edited by caspian; 08-30-2018, 11:54 AM.Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
I'm trying to understand the mainboard screen printing but pl710 is not present, but I have pl709 anywhay resistence pl709 6 Mohm
PQ302 pin 1,2,3 392kohm
pin 4 158kohm
pin 5,6,7,8 go up 20 MohmComment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
that is right. It is time to replace a new PQ304 now before you change any other component. after the replacement, measure voltages on pins of PQ302. Find a good replacement for PQ304.Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
Replaced PQ304 from other mainboard (DTA144EUA).
Same problem.
Measure on PQ304:
pin 1 18,40v
pin 2 19,80V
pin 3 20,01
measure PQ302:
pin 1,2,3 19,77v
pin 4 19,95V
pin 5,6,7,8 1,80vComment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
so we have made no great progress yet. now remove PQ302 and measure voltages on PQ304.Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
PQ302 removed.
Voltage PQ304:
pin 1 19,7V
pin 2 19,9V
pin 3 20,1 vComment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
now that PQ302 is removed, try to replace PQ302 by a new one which you know is healthy.Last edited by caspian; 08-31-2018, 06:25 AM.Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
ok, now I see to find it. I was doubtful if the problem could depend on an charger ICComment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
yes, it is possible. ACOK should be high but it is zero. to check it, measure voltages on pins 5,6,12,16,19,20 of PU301.Last edited by caspian; 08-31-2018, 07:25 AM.Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
Replaced for safe pq301 and reflow zone with flux and laptop start normally. Testing...Comment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
bq24737 ACOK is active low so this is fine. The issue really seems to be at the voltage divider PR303/PR307.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Lenovo G50-80 No power on (no led) (ACLU3/ACLU4 UMA NM-A362)
does it charge the battery now?Comment
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Lenovo 80e5 g50-80 ACLU3/ACLU4 NM-A361 rev.1.0
hello I would like some help, my laptop Lenovo 80e5 g50-80 ACLU3 / ACLU4 NM-A361 rev.1.0 does not turn on. when I insert power the led4 flashes and the fan moves a little. I only found the diagram pdf 2014-09 -10 REV0.4. I would need for BoardViewer the version for my ACLU3 / ACLU4 NM-A361 rev.1 and also schematic pdf. Also doing measurements with the multimeter I find on the line + 1.35_VGS to ground 6.06 ohm. According to me too low.
am I facing a short circuit?
that line affects the rams soldered on the board
thank... -
Hi, everyone.
I have this notebook that won't charge.
In Windows, the charger icon doesn't appear on the battery, but the charger turns on the notebook normally.
PU301:
Pin 5 (ACOK) - 5.97v
Pin 6 (ACDET) - 1.83v (should have 2.6)
Pin 16 (REGN) - 6v
PQ308 has no gate voltage, so it doesn't drive PQ309 low
With the battery connected, its voltage goes the reverse way to the jack, having 14v and not 20v:
PQ301 e PQ302
Pinos 1,2,3 14v
Pino 4 5v
Pinos 5,6,7,8 com 14v... -
Hello, someone have Lenovo G50-80 (ACLU3/ACLU4 NM-A361 Rev.:1.0) schematic? -
Hello,
Lenovo G50-80 (ACLU3/ACLU4 UMA NM-A362) Rev 1.0
With battery laptop work perfectly ! But with charger no power and not charging ! What can be the problem??
Direct from Charger PIN no connect to laptop: 20.v
PQ301 (4407A)
Drain: 20v - 19v 17v fluctuating
source: 19v - 18 -16v fluctuating
Gain: 19v - 18 -16v fluctuating
PQ302(4483a)
Drain: 2.5v then 5 then 10v then 11v sometimes18 then again 2.5v again and again..
source: 19v - 18 -16v fluctuating
Gain: 19v - 18 -16v fluctuating -
Forum this lenovo just charge when is off and when the battery is nearly 50% laptop shut down
Any idea how start the revisión thx
Comment