The flash of Canon IS870 camera is smoking. Expert help.

Under normal circumstances, if there are oil stains or other combustible materials on the lamp holder of high-power hot shoe flash, the combustible materials may be ignited during full-power continuous flash photography, and the stains can generally be wiped off. However, the power of general household cameras is generally small, the callback time is long, the heat accumulation is small, and the possibility of igniting stains is not great. It may be that there is a problem with the internal high-voltage line. It is recommended not to enable the flash again at this time, otherwise the whole flash circuit and even the motherboard may be damaged.