Hello,
I got a Lenovo G50-70 NM-271 Rev.1.0 that does not turn on.
First the Laptop worked, only for about 1 hour and the shut off,
but you could just boot it back up for another hour.
Then it quit working for total, and it was disassembled.
2 Persons already looked at it, but did not come to a conclusion.
The Bios UC3 was removed and put on with new chip and Program.
I have now messured a few things :
Present so far :
- B+ 20V
- 5VALW
- 3V_SPI (UC3 Pin 8)
- 3VALW
- 3VLP
- 3VL
What is missing is :
- 3VS (Q24-Pins 1-3) (J1+J2)
- 1,35V (PJ316+PJ317)
- 0,95VGS (PJ709)
- 0,675VSP (PJ315)
I then looked if i get the 3VS at Pin 11 of the IT8586E, but there is 0V
as well
I checked Pin 11 and J1+J2 against Ground, but no short as seems.
When i try turning it on, the CPU Fan turns about 1/4 Turn, then stops.
If i leave the charger connected, it trys to startup again and again, the fan
turns a bit, stops, waits a few seconds, clicks again, waits.
When i disconnect and reconnect the charger, it does nothing, as long
as i don´t press Power-On or NOVO Button.
I am thinking the IT8586E is bad ?! What could i test more ?
A scematic was found here :
https://www.badcaps.net/forum/attach...7&d=1454346973
If needed i can take Pictures of Board.
Would be great if someone has a good clue.
Chris
I got a Lenovo G50-70 NM-271 Rev.1.0 that does not turn on.
First the Laptop worked, only for about 1 hour and the shut off,
but you could just boot it back up for another hour.
Then it quit working for total, and it was disassembled.
2 Persons already looked at it, but did not come to a conclusion.
The Bios UC3 was removed and put on with new chip and Program.
I have now messured a few things :
Present so far :
- B+ 20V
- 5VALW
- 3V_SPI (UC3 Pin 8)
- 3VALW
- 3VLP
- 3VL
What is missing is :
- 3VS (Q24-Pins 1-3) (J1+J2)
- 1,35V (PJ316+PJ317)
- 0,95VGS (PJ709)
- 0,675VSP (PJ315)
I then looked if i get the 3VS at Pin 11 of the IT8586E, but there is 0V
as well
I checked Pin 11 and J1+J2 against Ground, but no short as seems.
When i try turning it on, the CPU Fan turns about 1/4 Turn, then stops.
If i leave the charger connected, it trys to startup again and again, the fan
turns a bit, stops, waits a few seconds, clicks again, waits.
When i disconnect and reconnect the charger, it does nothing, as long
as i don´t press Power-On or NOVO Button.
I am thinking the IT8586E is bad ?! What could i test more ?
A scematic was found here :
https://www.badcaps.net/forum/attach...7&d=1454346973
If needed i can take Pictures of Board.
Would be great if someone has a good clue.
Chris
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