The attached picture just for example, not real experimentsHow do the repaired light bulbs fail? Which LED have you used to replace the defective ones? Or what have you tried to repair the light bulb, the attached picture suggests you have replaced the LEDs.
Another led of the led series failed , if repair, another one fail and so onthe question is what has failed after the repair, an other component/LED or the LED substitution?
The leds are driven by constant current led driver, you mean voltage change across the leds?, more voltage cause led to burn?I think the led's simply get too much current. It's indicated by your experience with various repairs. Can you find the adjustment that reduces current to the led's?
Correct. So by reducing voltage you also reduce current. The aim is to reduce power in each led, thus reducing stress.The leds are driven by constant current led driver, you mean voltage change across the leds?, more voltage cause led to burn?
Other options: heat gun, or iron (used for clothing), I even used a rather thick aluminum sheet (10mm) on a kitchen stove for SMD soldering.to heat the back of the substrate on a gas flame
How add shunt resistor or pararell resistor on circuit like this?Adding a series resistor probably wont help. The constant current driver will just increase its voltage (within it's limitations) to compensate and restore the same current as before. Shunting some current through a resistor in parallel will work but increase the load on the already stressed driver and increase the heat produced, probably counter productive overall.
I know how, but just hardly find same specifications of smd led, that’s why thinking of other solutionsOther options: heat gun, or iron (used for clothing), I even used a rather thick aluminum sheet (10mm) on a kitchen stove for SMD soldering.
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