No power ACER C5V01 LA-E891P

[kalilinux25]

Hi I have motherboard that has no power 19v power rail is prsent no shorted found, checking the PU501 i dont have +1.2vp voltage then +0.6VSP voltages

MOD Edit: Schematic & Boardview moved to Schematic requests sub forum --> https://www.badcaps.net/forum/showthread.php?t=123071
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[Techtiger]

Re: No power ACER C5V01 LA-E891P

Hi I have motherboard that has no power 19v power rail is prsent no shorted found, checking the PU501 i dont have +1.2vp voltage then +0.6VSP voltages

+1.2VP +0.6VSP comes after pressing the power button first check
+RTC VCC
SOC RTCRST
+19VB
+3VLP
EC ON
+3&5VALW
SPOK
+1.8VALW PRIM
+1.8VALW PG
1.0VALW PRIM
EC RSMRST
ON/OFF
Unless you don't have this requirements the MOB will not power on

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

i only have the +3VLP on the supply unit I dont have any responses , what maybe the problem of this board. even pressing power or jumpering the power pins

[Techtiger]

Re: No power ACER C5V01 LA-E891P

Does PL401 PL402 output 3/5ALW? Test impedance test with multimeter on PL401/2

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

+1.2VP +0.6VSP comes after pressing the power button first check
+RTC VCC
SOC RTCRST
+19VB
+3VLP
EC ON
+3&5VALW
SPOK
+1.8VALW PRIM
+1.8VALW PG
1.0VALW PRIM
EC RSMRST
ON/OFF
Unless you don't have this requirements the MOB will not power on

PL401 HAS 5V present but in pl402 has no voltages

[Techtiger]

Re: No power ACER C5V01 LA-E891P

Remove the jumper pj403 and test Ohms both sides , test 19V in PQ402 , test cap PC413 Ohms , test PU401 pin 6 7 8 9 10 11 Voltage

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

PJ403 the left side has 19ohms the right side has 400 ohms PQ402 has +19v PC413 has 200 ohms PU401 pin 9 has 4.7vpin 10 has 4 milli volt pin 11 has no voltage

[Techtiger]

Re: No power ACER C5V01 LA-E891P

if thats so 19 Ohms then PL402 should be the same that's not good now you have to test PC416 PR410 PQ402 for short and pin 6 of PU401 must have 3.3V EN or change the PU401

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

if thats so 19 Ohms then PL402 should be the same that's not good now you have to test PC416 PR410 PQ402 for short and pin 6 of PU401 must have 3.3V EN or change the PU401

PC416 pr410 has no smd part but it has no short pin 6 has no voltages at all

[Techtiger]

Re: No power ACER C5V01 LA-E891P

PC416 pr410 has no smd part but it has no short pin 6 has no voltages at all

Trace it back 3V_EN comes from this pic point MAINPWON becomes EN through a Z-Diode

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

Trace it back 3V_EN comes from this pic point MAINPWON becomes EN through a Z-Diode

MAINPWON has 3V the other side has no voltage at all

[Cesert]

Re: No power ACER C5V01 LA-E891P

Thx for the schematics and board views.

[adonees]

Re: No power ACER C5V01 LA-E891P

Thanks for the schematics I just figured out that the Camera module failed and was causing short and the laptop was only blue light flashing.

[FixStation2020]

Re: No power ACER C5V01 LA-E891P

File Type: pdf Acer Aspire A515 series Compal LA-E891P r1A.pdf (1.83 MB, 590 views)
File Type: rar ACER C5V01 LA-E891P REV 2A.rar (329.4 KB, 530 views) i have thesame prob.of this laptop ....thanks to someone giving file

[kalilinux25]

Re: No power ACER C5V01 LA-E891P

File Type: pdf Acer Aspire A515 series Compal LA-E891P r1A.pdf (1.83 MB, 590 views)
File Type: rar ACER C5V01 LA-E891P REV 2A.rar (329.4 KB, 530 views) i have thesame prob.of this laptop ....thanks to someone giving file

great

[Mazorca]

Re: No power ACER C5V01 LA-E891P

This board has the power button on the keyboard on the laptop. How do I bypass that button and turn it on manually? The keyboard had liquid damage and has been taken out.

[stingerchamp]

Re: No power ACER C5V01 LA-E891P

Provide ground to connector pins

When you press power button below power button connects to ground and this gives ground to connector pin and board turns on


At connector with tweezers short pin 1 or 2

Look in schematic

[Mazorca]

Re: No power ACER C5V01 LA-E891P

Thank you stingerchamp. I tried shorting pin 27 (ON/OFFBTN#) on the keyboard connector, no luck, there is no voltage either. There is no ACOK(on the charger) or +3VLP either so Im just going to put it aside.

[Sephir0th]

Re: No power ACER C5V01 LA-E891P

MAINPWON has 3V the other side has no voltage at all

Did you solved this? It's exact the Same Case Here. 3V_EN isn't Coming Out, but MAINPWON present. No short found. Diode Reads 0.344V/O.L. in Diode Mode. Do i have to replace the diode, the IC or the whole SIO?

Thank you in advance!

[mcplslg123]

Re: No power ACER C5V01 LA-E891P

RB16 both sides 3V present?? If present, you can cut the track between diode and 3v_EN and thereby enabling 3V_EN from 3V_EN_R. Revived a dell 3567 15341 mb using this trick where the ram ic was not generating VTT but 1.2V was present on coil.