OpenBeken RGB Bulbs with BK7231T Chips Overheating Despite Renewed Thermal Glue

Openbeken rgb bulbs - extreme temperatures are happening on a couple my bulbs which are small bk7231T chips. Is there a way to get these temps down? I have renewed the thermal glue between the aluminium baseplate but it’s not helped

You would need to use a larger heatsink, as the current one is probably too small and this is where new paste will not help.

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Can you show what it looks like as maybe something can be added.

are you setting powersave 1 in startup command or autoexec?

the SM2135 current may be too high vs factory setting



did Easy Flasher mention current in info extraction? if not, it can sometimes be seen in the boot log of original firmware
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/commands-extended.md

Im not no - I thought powersave was just to save power when in an "off" state?

I would rather not dismantle the bulbs again and break the glue however I will say the "heatsink" is a very cheap piece of aluminium possible 1mm thick. They are not the most robustly built bulbs. They are small too being "candle" e14 style, I dont suffer the problem as much with larger e14 type

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Ive tried the various power and current options, no real change. I think I will retire these bulbs and switch it out to an LED strip (they are in a funky style of lamp which could accommodate a strip without being visible from exterior)

You need to lower the SM2135 current. This is the solution. Tuya might even used lower current setting, we don't import it, yet. Maybe we should lower the default one.

I had similar issue on LN882H. Reducing LED driver current through console command in autoexec.bat is the solution.

I will say even more - you should make it lower than it was in Tuya, this way, your bulb will have much longer lifespan. Those chinese bulbs are always working at their limit and they are more or less designed to fail early, so you can buy next one soon.

What setting would you recommend? I have
SM2135_Current 0x00 0x00 in startup

I don't remember it from memory, but here's how it looks like in our codebase.

Defaults:


The only question is do you start SM driver first? If not, it may not get applied.

Driver is 100% started. I figured to run at the lowest 10ma setting but still temps are 90-100 degrees

Are you sure that reading of temperature is correct? That's very high. Maybe our calibration is wrong on T.

Or maybe we need a futher solution, for example, a PWM duty limiter/remap?

it certainly feels it by touch alone when I remove the bulb, almost like handling an old incandescent bulb

>>21742119

I think a limiter for pwm would help I have another bulb that doesn’t use the other drivers and that over heats too