Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

[kalilinux25]

LAPTOP: IDEAPAD 3 14IIIL05
MODEL NAME: 81WD
SERIAL NUMBER: PF2K713H
BAORD: GS454/GS554/GV450/GV550 REV 1.0 NM-D031 2019-12-06
PROCESSOR: i3-1005G1
GRAPHICS: NO GFX
ONBOARD RAM
ISSUE: NO DISPLAY


taking 30milliamp

ALW_PWRGD-3.1v on and off state
EC_RSMRST#- 3.0v
PCH_PWROK- 0v onstate and off state 9.9k ohms
PM_SLP_S3#- onstate 0v off state 0v
PCH_DPWROK-3.0v on state and off state
VCCST_PWRGD_R- 0v on/off state
+VCCIN_AUX -0.8v
+VCCIN- 0v
+1.8VALW_P- 1.5v on and off state - 460 ohms going up
+VDDQ_OUT- 0v on and off state - 182 ohms

hope someone can help thanks in advance
I also tried flashing types of bios but nothing had change .

[mcplslg123]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

Measure resistance on all coils on ohms mode.

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

Measure resistance on all coils on ohms mode.

ill update it sir tommorow

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

Page 3 of schematic has power sequence block diagram. Why not follow it? Does it makes sense to measure PM_SLP_S3 when PCH_PWROK is not correct?

Measure resistance on all coils on ohms mode.

+3VLP-3.3v
+3VALW-3.3v
+3VL_EC -3.3v
+3VL -3.3v
3VALW_PCH_EN -0v on and off state 99k to gnd
EC_ON_1.8V -3.3v
SUSP# -0v
PLT_RST# -0v
VCC_FSPI -3.3v

+5VALW- 5V
EC_ON-3.3v
PCH_RSMRST#_R-3.0v
SYS_PWROK-0v
PCH_PWROK-0v on and off state
+3VS-0V- on and off state 28k to gnd
+5VS-0v on and off state 3.1mohms to gnd
+1.8VALW -1.5v on and off state 450ohms to gnd


VCCRTC-3,0V
SRTC_RST#-3.0V
RTC_RST#-3.0V
+3VALW_PCH-3.3V
EC_RSMRST#-3.0V

coil.
PL9801 -146ohms
PL3400 -57ohms
PL3401 -57ohms
PL1101 -6kohms
PL1601 -605ohms
remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
if PJ406 is connected together it has 602ohms without the PL1601 remove.
PL9802- 153ohms
PL9800- 445ohms
pl100- 1.4megaohms

[mcplslg123]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

PL1601 -605ohms
remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
if PJ406 is connected together it has 602ohms without the PL1601 remove.

Re-measure resistance to GND on PJ406,pin2(jumper being open). I strongly doubt your measurement here.

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

PL1601 -605ohms
remove PJ406 - pin 1 -has 2megaohms pin 2 has 6kohms
if PJ406 is connected together it has 602ohms without the PL1601 remove.

Re-measure resistance to GND on PJ406,pin2(jumper being open). I strongly doubt your measurement here.

i recheck again sorry it didnt have low resistance reading now is 0.662k from PJ406 to gnd

[mcplslg123]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

This reading is with PJ406 open or closed? If open, the reading is on which pad?

If the reading is 0.662K on pin2 while jumper is open, then you have some short on consumer side. The resistance should be atleast few kilo ohms.

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

This reading is with PJ406 open or closed? If open, the reading is on which pad?

If the reading is 0.662K on pin2 while jumper is open, then you have some short on consumer side. The resistance should be atleast few kilo ohms.

yes its on pin 2 but Im having stable 5v, why?

[mcplslg123]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

You always reply partially adding to the confusion. No mention of whether 5V is present with jumper in place or open.

To me, resistance og PJ406(jumper closed) should be few kilo ohms and usually 5V line has resistance of 10K or higher-so i've my doubt.

Wait for others comment.

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

You always reply partially adding to the confusion. No mention of whether 5V is present with jumper in place or open.

To me, resistance og PJ406(jumper closed) should be few kilo ohms and usually 5V line has resistance of 10K or higher-so i've my doubt.

Wait for others comment.

Resistance to GND of +1.8VALW sounds low also, maybe a bad pchh?

[kalilinux25]

Re: Lenovo IDEAPAD 3 14IIIL05 no display keeps restarting

Unit as been fixed it was just a shoorted SY6288D20AAC. UI4302 -Was the issue.Thanks for point the 5v line maybe the issue