QqEEH - Lenovo NM-D522

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • bociub
    Member
    • Dec 2023
    • 32
    • UK

    #1

    QqEEH - Lenovo NM-D522

    Hi There

    So I am looking for a part. Namely, a QqEEH. I beleive this is responsible to create the 3.3 power rail, but on my motherboard it is shorted to the ground. injecting 1 volt into the 20 volt power rail the IC heats up. Around the IC almost everything is shorted to the ground,
    Anyone knows what this little controller chip supposed to be?

    Thanks,

    Attached Files
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14673
    • Canada

    #2
    From the above database of parts:

    Qq*** SY8386BRHC (EL432 EL532 LA-H131P)

    Comment

    Related Topics

    Collapse

    • mkdj
      Lenovo Thinkpad L480 : 3VALW rail shorted to ground, but I can't find the shorted component
      by mkdj
      Dear all,

      Laptop is Lenovo Thinkpad L480 (boardview can be found in this badcaps topic). When pressing the power button the LED power light turns on, but nothing else happens.

      I removed the motherboard, checked for shorts on the main inductors. I found that there is a short to ground on the +3VALW_P rail (@PL201). I soldered a wire on the PL201 inductor, and I injected up to 1.3V with my power supply. Current drawn is approximately 3.2A.

      I used a small thermal camera to locate the shorted component. But nothing on the board heats significantly, except the...
      08-11-2025, 04:55 AM
    • mkdj
      Acer TravelMate P214 - N19Q7 main power rail shorted to ground
      by mkdj
      Dear all,

      I have taken out the motherboard of a Acer TravelMate P214. There is a short to ground on the main power rail (19V). I don't have the schematics or boardview for this board (DAZ8IMB1AA0 REVA). But I have found 4 MOSFETS close to the main power rail : 2 N-Channel and 2 P-Channel.

      I have checked resistance across each of the 4 MOSFETS. I have the following readings:
      Both N-Channel Mosfets: nothing odd

      P-Channel MOSFET number 1:
      source - drain : 117 kOhm
      source - gate: 96 Ohm
      gate - drain: 117 kOhm


      P-Channel MOSFET...
      08-20-2025, 06:08 AM
    • coasterghost
      Lenovo T14 Gen 2 Type 20XK Model 20XK0069US Odd Charging Issues
      by coasterghost
      For Badcaps Readers, Please note that I am hopefully going to present this same message to Lenovo to see if they have any insight to the matter as well and figured to share the entirety here for clarification. The System is out of warranty as it is but does have the option to have it extended.

      Model Information: T14 Gen 2 (Type 20XK, 20XL) Laptop (ThinkPad) - Type 20XK - Model 20XK0069US
      Board: T14 Gen 2 (Type 20XK, 20XL) - Type 20XK.

      System Hardware:
      Processor: AMD Ryzen 7 PRO 5850U
      Memory: 1x 16GB DDR4 3200 (Soldered on Board); 1x Crucial 32GB DDR4...
      09-08-2025, 10:46 PM
    • lefetylorant
      Lenovo Thinkcentre tiny M90Q gen 1 - no 12V rail
      by lefetylorant
      Hello Everyone,

      Long story short, I got this unit for very cheap.
      I've started to experiment with it's BIOS, as I did before successfully with an M900. However my very bad quality SOIC clip broken while dumping of the biosof and it must have damaged something on the panel, because it does not turn on, and does exactly nothing when powered. The maximum voltage that could have affected something is the 3.3 or 5v from the IC clip, because the unit was not powered while the bios dumping was in progress.

      I've performed some measurements:
      - 20V rail perfectly...
      09-14-2023, 05:05 AM
    • Nagy Daniel
      Lowest possible resistance on laptop motherboard rail - Guide Table request
      by Nagy Daniel
      Hi, I'm Daniel, and I'm new to the world of repairing motherboards.

      I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.

      I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.

      So, I generated a table with AI so I can...
      03-04-2025, 08:24 AM
    • Loading...
    • No more items.
    Working...