Repair LED bulbs, analyze cause of failure,

Last time, the LED light fixture broke down, and this time, the LED light bulb I was using was broken.
So I ordered and fixed the LED chip.
If the converter is voltage unstable, 6 LEDs have failed.
And I took a thermal imaging camera to see how much heat I know.
I had a lot more heat than I thought.
In my opinion, I think I should sell it with a fan to lower the heat.
materials
1.LED chip (2835 9v)
2. Electric iron and tweezers, lead
3. Hera
4. Power supply (9v battery is also possible)