This is an IP Camera circuit and after i put accidentally 12vDC instead of 5vDC this component has died with smoking. I want to replace this component with new one but i didnt figurate it out what is this component and have a closer look under magnifier find some clues as u can see pictures below. This component have 5 lead Barely seen a write "A14P" maybe, but not sure U10 sign left side of component. Please help what is this component so i can order new one and replace it.
Fried bugs in an SOT23-5 package with carmelized epoxy toxic fumes
There is another SMPS , U20 which is likely for 3.3V USB and other logic chips.
Since this SMPS is located near the speaker port, I am having second thoughts about the function of this regulator. By tracing the output, you may find it is used as a boost regulator like +12V used for Speaker port amplifier (not visible) and the MOTOV1 port. Shorting either of those outputs may have contributed to the problem of fusing the regulator. Although they tend to have UVP, OVP, OTP features that only works if the sense input is not damaged. So handle with care and use a very low current limited lab supply in your experiments and gradually raise the current limit to 50mA with a preset voltage.
I see something worrying in your photo of the main PCB. If my hypothesis is correct then, unfortunately, you are wasting your time trying to replace the SOT23-5
U10 component mentioned in your question.
In your photo of the main PCB, there seems to be a "blister" (i.e. a raised area) on the top of the main TQFP IC (
If that is really a "blister" on the IC, and not a reflection or other photographic anomaly, then the IC has probably suffered catastrophic internal damage. Damage to ICs like that, occurs due to internal heating.
My hypothesis is that when you connected 12 V to the 5 V power input, an excessive voltage was applied to other components including
U16, causing internal damage. I expect that
U16 is a programmed MCU and so you will be unable to replace it, as it probably won't be sold, pre-programmed, as a spare part by the manufacturer of this IP camera. Also, other components on the PCB could also have been damaged by the over-voltage event.
That is why my conclusion is, if that IC is blistered, then you are likely to be wasting your time trying to repair that PCB.