04-05-2016 08:26 AM
I am hoping someone can help me troubleshoot my Z710 as it is my main Laptop and badly needed.
The power jack (rectangular) was acting up for a long time due to wear and eventually wires popped off the jack. I re-soldered it and it worked for a week then all of a sudden it would not power up.
I removed/re-inserted the power plug a few times and the power LED seemed to light for a second I could not get any sign of life at all.
I took it apart (again) and cut the power cord and soldered it directly to the cable inside
There are 5 wires on the cable, 2 black, 2 red and 1 blue but looking at the jack and the mobo, theres only actually + and minus connections. On Mobo power connector, 3 pins to + and 2 to -
Both blacks are tied together and 2 reds and blue tied together (+)
So now I have + going to Red+Red+Blue and Gnd going to Black+Black
I see 19 volts at the power connector on the motherboard but pressing the power button does nothing and no LEDS light up. Tried with and without battery (I beleive bat is dead)
Does anyone have any tips?
Maybe something simple like needing to hold the power btn down for 30 secs. or something…
If not where can I find a schematic to start some board level troubleshooting
I have an Electronics background
Any help really appreciated. I need this working asap
04-06-2016 12:03 PM - edited 04-06-2016 12:08 PM
BTW, I would also appreciate any help on where to purchase a new modo in case I cant fix this one.
The model on the board is DUMB02
(What a name)
Almost as bad as the hard drives a friend used to sell called Daejong, apparently pronounced 'Die Young'
I have bought a few mobos from china that were DOA so I am leery unless someone has experience with a good seller.
Don't want to pay $$$$$$
04-07-2016 02:57 PM
Hi endabuser ,
Welcome to the Community Forums.
It's hard to get you a board level schematics particular to an OEM seems it an internal information.
Moving forward , if you have tried to connect a different working adapter and still having same issue, try to check if the DC in port board is the only thing needed here as such would save you getting an entire board.
With the parts , best that you use the machine number from here on the parts look up page to get specific part number for your model. This would also give you the part number for other parts like motherboard .
FRU listing on the hardware manual are for generalized model (also review power check out page21) .
I tried using an example machine number 59387520 , specific parts you can check on the hardware manual as follows ( just an example , it may be different on your specific machine number)
90005019 DUMBO2 Power Board CARDS MISC INTERNAL
90204150 DUMBO2 Power Board Cable CABLES EXTERNAL
90004565 DUMBO2 MB W8S DIS GS 2G SYSTEM BOARDS (page73 item10 on HMM)
36200314 Delta ADL135NDC3A 20V6.75A adapter AC ADAPTERS
You may check on lenovo encompass for availability and pricing to compare from other resellers too.
Hope this helps .
04-19-2016 09:41 AM
04-19-2016 01:15 PM
Hi endabuser ,
Thanks for the update .
Hoping for some board technicians to be able to provide input.
I was thinking of rather less aggressive way of doing it like just to have those particular parts replaced aside from the ones listed above to include : part : 90202793 BAMBI DC-IN Cable CABLES EXTERNAL similar image here.