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LSC Smart Connect Power Strip Screw Removal Techniques

vsessink 6276 13
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  • #1 21259970
    vsessink
    Level 2  
    LSC Smart Connect Smart Power Strip teardown. Bought one on 2024-10-10 at Action.

    LSC Smart Connect power strip with packaging on a carpet background.
    Barcode label on a blue background with article number 3202887.

    This is a bit of a nasty power strip, because it has screws without a recess, i.e. no phillips, pozidriv, hex or whatever - they look like a nail! Also, the screws are sunk 10mm deep in the housing, so you can't use your pliers to turn them - the opening is way too small.

    Screw with rounded head lying on a wooden surface.
    Close-up of the LSC Smart Connect power strip casing with a small hole for a non-standard screw.

    So a teardown is, unfortunately, not doable with regular tools, I had to be creative.

    Luckily, the local Hornbach had a "spanhuls" (Dutch) or "Spannstift" (German) with the right diameter to enclose these nasty screws:

    Close-up of screws and a metal pin lying on a surface.

    Here is how to remove the screws:





    After that, a rather straightforward CB3S module can be found. You can program it in situ with a USB to serial programmer:

    Interior of a power strip showing the CB3S module.

    Close-up of the CB3S module in a smart power strip with pin labels.

    {
      "vendor": "LSC",
      "bDetailed": "0",
      "name": "LSC Smart Power Strip 3202887 Action 3680W",
      "model": "LSC Smart Power Strip",
      "chip": "BK7231N",
      "board": "CB3S",
      "flags": "0",
      "keywords": [
        "power strip",
        "relay",
        "switch"
      ],
      "pins": {
        "6": "Rel;2",
        "7": "Rel;3",
        "8": "Rel;4",
        "10": "Btn_Tgl_All;0",
        "14": "Rel;1",
        "23": "WifiLED_n;0"
      },
      "image": "https://obrazki.elektroda.pl/8471866500_1728724279.jpg",
    }
    
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  • #2 21261196
    piotrszulc1
    Level 10  
    @vsessink Did you make a backup of the original tuya firmware before flashing by any chance? Can you post it here?
    With it, there's a chance to create a cloudcutter profile and flash via OTA without a need to open it. Not all of us have these nice tools you do :)

    If you post the firmware backup, keep in mind that it might contain your wifi credentials (if the device was connected via app before).
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  • #3 21261588
    nielspiersma
    Level 9  
    Nice work, I also bought two. Firmware reports as 1.1.17 other hardware 1.0.5 in the Tuya app.
    I tried an OTA update with Cloud Cutter, but I was unsuccessful.
    It's always nice to flash these devices without opening them.
    At least for now you confirmed to me no RT chip is used :)

    Some observations: they seem to make use of the same casting as the "WOOX R6132 Slimme stekkerdoos met energiemeter"
    The plastic rubber caps are precisely the same as well as the wall mounting carvings.


    NIels
  • #4 21262606
    vsessink
    Level 2  
    >>21261196 I believe it's this one: readResult...-15-16.bin (2 MB)You must be logged in to download this attachment.
  • #6 21263663
    nielspiersma
    Level 9  
    Thanks @piotrszulc1,
    As unfortunate as it is, it is confirmed now, and there is no need to play with Tuya Cloud Cutter any more.
    I will do the soldering flash on the two I've bought. I think it is still a good buy.
    NIels
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  • #7 21264621
    nielspiersma
    Level 9  
    >>21259970

    There was a typo in the template, I've updated it:

    Code: JSON
    Log in, to see the code
  • #8 21269241
    nik156
    Level 18  
    Has anyone here on the strip and can write me if it makes any sounds, squeaks? I bought it and it squeaks, chatters, transmits walrus.
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  • #9 21270193
    nielspiersma
    Level 9  
    Hola,

    No it shouldn't make that noise. It has no speaker or other sound generator onboard.
    If it does make sound likely once.of the capacitors is faulty or a relay is flipping like there is no tomorrow.

    Bottom line, it should be quite a silent device

    Niels
  • #10 21270650
    nik156
    Level 18  
    Mine unfortunately squeaks when it is switched off. It's the second one I've replaced in the shop.
  • #11 21280747
    p.kaczmarek2
    Moderator Smart Home
    Pulse power supply coils can also squeal. However, are you referring to the relay when changing state from on to off or off to on?
    A power supply can also make a sound when it is faulty. See:
    How to fix a smart device that chirps, squeaks and makes strange sounds?
    Helpful post? Buy me a coffee.
  • #12 21281327
    nik156
    Level 18  
    I bought one and in the same sound I went to replace it. It turned out that the other piece was also squeaking. I abandoned the purchase and received a refund.
    It beeped without relay activation, just when plugged in, although when the relays were on you could also hear the beeping, but in a different form. Even when the power was switched off you could hear such a squeal with a descending parabola. This is known to be of great importance at night.
  • #13 21389637
    Maximilian0017
    Level 7  
    It looks more like a "Paspen" or "Spanstift" what you used to open it.
    Thanks for sharing on how to open it!

    And yes, this unit whines when the relays are all off.

    I'll try to open one in the coming week.
  • #14 21392765
    Maximilian0017
    Level 7  
    Just opened one of the units without damage using the 3 or 4mm "Paspen" or "Spanstift"
    It isn't that easy because the Paspen will pop off the screw quite easily.
    Tips:
    - first try to turn the Paspen until it locks a bit, then hammer it a few times.
    - during the removal keep pressure on the Paspen, even if it pops off try to grip it by turning until it locks and keeping pressure.
    - do not hit the Paspen with the hammer if you almost have the screw out, it will damage the threads.

Topic summary

✨ The discussion revolves around the challenges of disassembling the LSC Smart Connect Smart Power Strip, particularly due to the unique screws that lack a standard recess, making them difficult to remove with conventional tools. Users shared their experiences and solutions, including the use of a "spanhuls" or "Spanstift" to grip and turn the screws. Some participants reported issues with the device making unwanted noises, such as squeaks or chirps, which could indicate faulty components. Others confirmed that the device should operate quietly under normal conditions. The conversation also touched on firmware flashing and compatibility with Tuya Cloud Cutter, with some users expressing concerns about the device being patched, which complicates OTA updates.
Generated by the language model.

FAQ

TL;DR: Screws are headless and sunk 10 mm; "not doable with regular tools." Use a Spannstift; inside is CB3S/BK7231N, programmable in-place. [Elektroda, vsessink, post #21259970]

Why it matters: For LSC/Action owners, modders, and repairers who need to open, flash, and quiet this strip quickly and safely.

Quick Facts

How do I remove the headless screws without special bits?

Use a Paspen/Spannstift and follow three steps:
  1. Turn the pin in the screw bore until it grips, then give a few hammer taps.
  2. Keep downward pressure and turn steadily; re‑grip if it pops off.
  3. Do not hammer once the screw is nearly out to avoid thread damage. [Elektroda, Maximilian0017, post #21392765]

Which tool and size fits these headless screws?

A 3–4 mm Paspen/Spannstift works. It can pop off the screw, so maintain axial pressure while turning to keep it engaged. The pin often needs a light tap to lock before removal. [Elektroda, Maximilian0017, post #21392765]

Where can I buy the tool and what is it called?

One user sourced it at Hornbach, calling it a “spanhuls” (Dutch) or “Spannstift” (German). Bring the strip to match diameter. The approach encloses the screw shaft for torque. [Elektroda, vsessink, post #21259970]

Can I avoid damaging the screw threads during removal?

Yes. Keep consistent downward pressure while turning so the pin stays locked. If it slips, re‑grip by turning before tapping. Avoid hammering when the screw is almost out to protect threads. [Elektroda, Maximilian0017, post #21392765]

What smart module and Wi‑Fi chip does this power strip use?

It uses a Tuya CB3S module built around the BK7231N chip. This confirms a BK72xx platform for custom firmware work and pin mapping. [Elektroda, nielspiersma, post #21264621]

Can I program it without removing the module?

Yes. "You can program it in situ with a USB to serial programmer." Access the CB3S pads inside once the case is open, and use a 3.3 V UART tool. [Elektroda, vsessink, post #21259970]

Can I flash it OTA with Tuya CloudCutter?

Current reports show OTA flashing fails because the device appears patched. Expect unsuccessful CloudCutter attempts on this model and firmware family. [Elektroda, piotrszulc1, post #21263416]

What are the GPIO mappings for relays, button, and LED?

Pins: 14→Rel1, 6→Rel2, 7→Rel3, 8→Rel4. Button: 10→Btn_Tgl_All;0. LED: 23→WifiLED_n;0. This defines four controllable channels plus a global toggle. [Elektroda, nielspiersma, post #21264621]

What is the model code and power rating?

Template lists it as “LSC Smart Power Strip 3202887 Action 3680W.” Use the rating with appropriate safety margins and wiring practices. [Elektroda, nielspiersma, post #21264621]

Should the LSC power strip make any noise?

No. It has no speaker, and operation should be quiet. As one expert noted, “Bottom line, it should be quite a silent device.” [Elektroda, nielspiersma, post #21270193]

Why does mine squeal or chirp, especially when idle or off?

Switch‑mode power supplies and coils can squeal under certain conditions. A faulty PSU may emit sounds, and relay chattering indicates instability. Inspect or exchange if noise persists under normal load. [Elektroda, p.kaczmarek2, post #21280747]

My unit whines even with all relays off—what should I do?

Some buyers reported persistent squeal in multiple samples and chose a refund. If your replacement still whines when off, return it under warranty. [Elektroda, nik156, post #21281327]

What firmware and hardware versions have been observed?

Reported app versions include firmware 1.1.17 and hardware 1.0.5. An OTA attempt with CloudCutter on this setup was unsuccessful. [Elektroda, nielspiersma, post #21261588]

What’s the recommended path if OTA is blocked?

Proceed with a wired, soldered flash. One user planned a “soldering flash” for both purchased units and continued using them. [Elektroda, nielspiersma, post #21263663]

Does this LSC strip share its casing with another brand?

Observations suggest it shares the same casting as the WOOX R6132. Rubber caps and wall‑mount carvings look identical. [Elektroda, nielspiersma, post #21261588]

Any privacy concerns when backing up the stock Tuya firmware?

Yes. A full backup may include your Wi‑Fi credentials if the device was already paired. Sanitize before sharing archives. [Elektroda, piotrszulc1, post #21261196]
Generated by the language model.
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