Lenovo E430 Compal LA-8133P RT8205 issue

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  • jasko_jacker
    Badcaps Legend
    • Oct 2014
    • 1137
    • italy
    #1

    Lenovo E430 Compal LA-8133P RT8205 issue

    Hi,
    I spent many hours to solve this issue without result.
    If I insert the power cord I have only 4 volt on power mosfet PQ304 (page 46 schematic), battery receive the right voltage but without digital driving because it need the always on voltages.
    If I exclude RT8205 removing jumper PJ401 (page 47) with or without removing the +3VALW and +5VALW jumper (PJ402 and PJ403) the volt on PQ304 are ok.
    If I remove only the outs of RT805 with PJ402/PJ403 the issue returns.
    I have changed the RT8205 and his mosfets, checked the components around it , removed the PQ405A/B and so on....
    I think there is a component in another point of board that cause abnormal consumption on a secondary pin of RT8205 because the issue remain even if you exclude the outputs of the RT8205.
    Some ideas to try to solve ?
    Thanks so much
    Attached Files
    Tags: None
    • mahmoodjavan
      Banned
      • Mar 2018
      • 584
      • iran
      #2
      Re: Lenovo E430 Compal LA-8133P RT8205 issue

      Originally posted by jasko_jacker
      Hi,
      I spent many hours to solve this issue without result.
      If I insert the power cord I have only 4 volt on power mosfet PQ304 (page 46 schematic), battery receive the right voltage but without digital driving because it need the always on voltages.
      If I exclude RT8205 removing jumper PJ401 (page 47) with or without removing the +3VALW and +5VALW jumper (PJ402 and PJ403) the volt on PQ304 are ok.
      If I remove only the outs of RT805 with PJ402/PJ403 the issue returns.
      I have changed the RT8205 and his mosfets, checked the components around it , removed the PQ405A/B and so on....
      I think there is a component in another point of board that cause abnormal consumption on a secondary pin of RT8205 because the issue remain even if you exclude the outputs of the RT8205.
      Some ideas to try to solve ?
      Thanks so much
      ------------
      bios ec kbc
      Attached Files

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