Help in modifying an 8-mode Christmas LED curtain light

[kulit_shepherd]

Hi everyone,

I'm looking for some assistance modifying an 8-mode Christmas LED curtain light controller so that the lights remain permanently ON at full brightness whenever power is applied, without having to cycle through the different lighting modes.

The problem is that the controller doesn't remember the last selected mode. Every time the power is switched off and back on, it resets to the default flashing sequence.

Since I have several sets installed, manually selecting the steady-on mode every day is quite inconvenient.

Light Set Details:

• Manufacturer: Taizhou Huiyuan Lighting Co., Ltd.
• Model: XH-646 / 200L (based on packaging)
• Controller PCB marking: 220V-2.0
• Power supply: 220V AC, directly connected to mains
• LEDs: 200 per set
• Configuration: 6-meter-wide curtain with multiple hanging strands containing approximately 5–7 LEDs each
• Controller: 8 lighting modes, including steady ON

Controller PCB:

I've attached photographs of the circuit board.

The board appears to have:

• U1: 6-pin controller IC (markings appear to have been erased)
• SW1: Mode-selection push button
• Q1: Switching component
• B7: Possibly a bridge rectifier
• L1 and L2: Likely separate LED output channels
• Common positive (+) connection

When steady-on mode is selected, all 200 LEDs illuminate continuously at full brightness without visible flickering.

What I'm Trying to Achieve:

I'd like to retain the original power circuitry and LED wiring, but eliminate the flashing sequences so that both LED channels remain continuously illuminated whenever the lights are plugged in.

Ideally, I'd prefer modifying the existing PCB rather than purchasing replacement controllers.

My Questions:

1. Has anyone encountered this particular 220V-2.0 PCB or a similar controller?
2. Is it possible to bypass the sequencing function while retaining the original rectification and current-limiting circuitry?
3. Would this require modifying the switching components, or is there another way to make steady-on the default?
4. Are there any particular electrical or thermal safety concerns with this type of modification?

The lights are intended for outdoor installation on trees, so electrical safety and reliability are important considerations.

I'd appreciate any advice, particularly from anyone who has successfully modified a similar controller.

Thanks in advance for your help!

 

[Notenoughlights]

I'm not sure where you're seeing Q1 on that board.
All there appears to be is an IC of some kind, likely with built in triac outputs, a button, 2 resistors, capacitor and bridge rectifier.
If I was in your situation, I would consider binning the fire hazard set of lights and buying something with a low voltage supply.

If I had to guess, it would be this here. But be wary. You are messing with a controller that uses MAINS 240v AC power and unless you know what you are doing, do NOT proceed.