Dear all,
Thank you for your effort and for the good forum.
This is my first post. I have searched long time for this problems, but it seems no answer to my specific problem.
I have this laptop for a customer to check.
It is like in sleep mode and never gets out of it.
The power LED and keyboard backlight turns on shortly every about 5 seconds.
(It is like the video that was in one thread on badcaps forum - I cant find it now)
Only power off by pressing the power button for about 10 seconds. Pressing power button gets it to this sleep state again.
Could not find the write schematic and no board view. I have the NM-A74 schematic to get help from.
Details:
Lenovo Yoga 2 Pro
M/N 20266
Main board:
Kona_SVT
EBKN7 V-0
RIO board: Hannstar NS-A071 Rev 2.0
LIO board: Hannstar NS-A072 Rev 1.0
Charging seems OK
ADAPTER OK
Without charger - only battery:
Battery reseated
- S4/S5 state (DC)
- VCCRTC ? could not measure. RTC battery present.
- VIN: 7.2V
- +3VALW : 3.3V
Push power button gives:
S0 State with following voltages:
VIN: 7.2V
+3VALW : 3.3V
+5VAUX: 4.94V
+3VAUX: 0V
+1.2VSUS: 0V and momentary 1.2V every 5 seconds
CPU_CORE: 0V and momentary 1.xV every 5 seconds
MAINON: 0V and momentary about 2.5-3V every 5 seconds
If I press power button for about 10 seconds it turns off - ONLY on battery. It does NOT turn OFF if charger is connected.
When charger is connected it automatically gets “turned ON” but in this “Sleep” state. MAINON trying to turn on every 5 seconds
CPU does not get warm
No fan spin at all.
SMBUS signals shows 3.3V. Does not seem to be shorted.
When charging, coil PL7 gets hot.
Help needed. Thanks
Thank you for your effort and for the good forum.
This is my first post. I have searched long time for this problems, but it seems no answer to my specific problem.
I have this laptop for a customer to check.
It is like in sleep mode and never gets out of it.
The power LED and keyboard backlight turns on shortly every about 5 seconds.
(It is like the video that was in one thread on badcaps forum - I cant find it now)
Only power off by pressing the power button for about 10 seconds. Pressing power button gets it to this sleep state again.
Could not find the write schematic and no board view. I have the NM-A74 schematic to get help from.
Details:
Lenovo Yoga 2 Pro
M/N 20266
Main board:
Kona_SVT
EBKN7 V-0
RIO board: Hannstar NS-A071 Rev 2.0
LIO board: Hannstar NS-A072 Rev 1.0
Charging seems OK
ADAPTER OK
Without charger - only battery:
Battery reseated
- S4/S5 state (DC)
- VCCRTC ? could not measure. RTC battery present.
- VIN: 7.2V
- +3VALW : 3.3V
Push power button gives:
S0 State with following voltages:
VIN: 7.2V
+3VALW : 3.3V
+5VAUX: 4.94V
+3VAUX: 0V
+1.2VSUS: 0V and momentary 1.2V every 5 seconds
CPU_CORE: 0V and momentary 1.xV every 5 seconds
MAINON: 0V and momentary about 2.5-3V every 5 seconds
If I press power button for about 10 seconds it turns off - ONLY on battery. It does NOT turn OFF if charger is connected.
When charger is connected it automatically gets “turned ON” but in this “Sleep” state. MAINON trying to turn on every 5 seconds
CPU does not get warm
No fan spin at all.
SMBUS signals shows 3.3V. Does not seem to be shorted.
When charging, coil PL7 gets hot.
Help needed. Thanks
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