Samsung NP370E4K No backlight running on battery

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Kambi13
    Senior Member
    • Aug 2022
    • 134
    • Portugal
    #1

    Samsung NP370E4K No backlight running on battery

    Hi all, need some help. I have a Samsung NP370E4K-KD2BR, which as a 5th Gen Intel CPU that works fine when running with the charger plugged in, but has soon as I remove it and it's running on battery the screen backlight goes off.

    Tried different battery - no change
    Tried different screen - no change

    Removed the plastic film from the screen inverter and looked for pwm signal which as about 3.3v when running with the charger plugged in, when I take it off the voltage drops down to 2.232v, so my best guess is that the EC is not providing the correct voltage.

    Would it be possible that a ME clean could solve this issue?

    Best Regards
    Last edited by SMDFlea; 09-04-2023, 11:13 AM. Reason: Added "Samsung NP370E4K" to thread title
    Tags: None
    • natic
      Member
      • Sep 2018
      • 34
      • EU
      #2
      Re: Samsung NP370E4K No backlight running on battery

      Hello!

      First of all specify the motherboard marking code.

        Comment

        Previous template Next

        Related Topics

        Collapse
        • Document Archive
          ISL88739AHRZ ISL88739 Laptop Battery Charger Datasheet
          by Document Archive
          The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
          configurable for operating as either a Hybrid Power Boost (HPB)
          charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
          4-cell batteries. Both configurations allow the battery to work with
          the adapter together to supply the system load when it exceeds
          the adapter capability, referred to as system Turbo mode. HPB
          charger configuration reverse-boosts battery energy to the system
          bus to help the adapter provide the system power in Turbo mode.
          NVDC charger configuration...
          11-05-2024, 03:28 PM
        • Document Archive
          ISL6257HRZ ISL6257HRZ-T Laptop Battery Charger Datasheet
          by Document Archive
          ISL6257HRZ ISL6257HRZ-T Laptop Battery Charger Datasheet

          Highly Integrated Narrow VDC Battery Charger for Notebook Computers

          The ISL6257HRZ ISL6257HRZ-T is a highly integrated battery charger controller
          for Li-Ion/Li-Ion polymer batteries. ISL6257 is designed for
          Narrow VDC applications where the system power source is
          either the battery pack or the regulated output of the charger.
          This makes the max voltage to the system equal to the max
          battery voltage instead of the max adapter voltage. Operating
          at lower system voltage can improve...
          11-05-2024, 04:43 PM
        • flat-earther
          how to prevent a connected charger from draining battery when not charging?
          by flat-earther
          I have an RC radio handset(Taranis QX7) which doesn't have internal battery charger which means I had to remove the battery every time I needed to charge it.
          So to improve it, I added a 15W USB-C charger board(link) inside and soldered it to the same connector on the PCB where the battery plugs into, great, now I can simply charge it with a USB-C cable.

          but the problem I found is that after the radio sat for two weeks without being used the 2S 18650 battery that I'm using was at 4.2V!
          So the battery is backfeeding the charger and being drained.

          How can I prevent...
          08-07-2025, 01:04 PM
        • Bowline
          Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
          by Bowline
          My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

          Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

          My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
          The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
          I have tried multiple different Dell power adapters. My Dell...
          06-11-2025, 10:13 AM
        • sam_sam_sam
          Bauer tool battery pack charging with a HERCULES charger modification
          by sam_sam_sam
          The Bauer power tool battery charger just has to many issues with the charger over heating because I several HERCULES Hercules battery chargers that are 3 amp charge and because they have gone on quite a few times over the years before they came out with the fan cooling battery charger I going to modify one so I can charge Bauer battery packs faster than the crape battery charger that they have

          Here is how this modification is going to be done I taking a 1.5 amp hour battery enclosure and gutting it removing the battery cells and replacing some Ryobi 1.5 amp hour battery pack that...
          05-06-2023, 12:17 PM
        • Loading...
        • No more items.
        Working...