No power, burnt chip

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I have a Tview t90dvfd portable dvd player wont power on. Occasionally screen would flash and infrared bulbs for remote would turn on.

I pulled the cover and found a burnt chip, not sure what it was. i searched, it might be an optocoupler, but the ones i bought are too large.

4 prong, perfectly square after i removed the damaged one.

https://youtu.be/5QeawtJoZJA

Update (12/09/2018)

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Can you take close-up pictures from multiple angles? Also, are there any identifying markings in white paint near it on the board?

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My initial suspicion is some sort of DC/DC converter. It would be strange for an Optocoupler. Looking at fail modes, their short-circuit is usually corrosion or tin whiskers, not internally.

It could be a tiny relay, or a number of other things. When the device is powered, what voltages are on each side of the burnt component?

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I'll have to get voltages, i saw another vid he called it that so i thought, why not lol.

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No marks or anything I can tell.

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Shaky is best I can do lol.

I would have uploaded pics, but didn't see upload button. Now I do.[image|1641269]

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1 Answer

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A shaky-cam video doesn’t allow us to discern any detail at all. Post a clear and well focussed picture.

Based on what I can see, I doubt it’s an optocoupler as they tend to be used to separate a high voltage section of the board with a low-voltage section. When designing one in a circuit, a physical slot is milled into the pcb. So post a good picture where we can see the component designations and the surrounding circuitry.

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jim will be eternally grateful.
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