DBPower RD-810

[Patrick13770]

My grandson found this mini projector at a garage sale for $5. They said it was never used and it had been sitting on a shelf. So he took it home and plugged it in. Suddenly he heard a sizzling sound and smelled smoke. So he called grandpa and asked if I would take a look at it.
Turns out the IC at U4 fried. Does anyone know what the component is because I can't get accurate info off it. I'll attach a pic of the area.

 

[ZipZapOuch]

My grandson found this mini projector at a garage sale for $5. They said it was never used and it had been sitting on a shelf. So he took it home and plugged it in. Suddenly he heard a sizzling sound and smelled smoke. So he called grandpa and asked if I would take a look at it.
Turns out the IC at U4 fried. Does anyone know what the component is because I can't get accurate info off it. I'll attach a pic of the area.

Chips with "C7E" seem to be some types of DC-DC regulator or converter from Torex Semiconductor. Seems like your grandson's "good deal" is your migraine moment. Good luck if you elect to fix it or if you decide to break the news to your heir that it belongs in the bin.

 

[Tony Stewart]

The SMD code database indicates it's a Torex 3.4V 100 mA LDO which ought to have thermal protection unless supply input was reversed.

 

[ZipZapOuch]

The SMD code database indicates it's a Torex 3.4V 100 mA LDO which ought to have thermal protection unless supply input was reversed.

Careful, Torex seems to use the same code for nearly all of their regulators.
Also, a TO-25 package (used by Torex) is a 5-pin device. So, we're likely on the wrong track.

 

[Tony Stewart]

yes, the SOT-26 LDOs tend to be dual output regulators which are not listed on Torex site, yet C7E's are exclusive to Torex, unless TI once made these or one of its former acquisitions.

 

[sagor1]

Having looked at some "fixit" sites for RD-810, the power supply is a separate unit, but the blown chip in on the main board. Thus, unless the power supply itself is bad (seems to be a universal supply), the chip failure would not have been caused by a mistake in how the supply was plugged in. (the DC power cable seems to be keyed)
That said, for that chip to blow, there must have been something else that faulted on the main board, causing the chip to fail. Hard to diagnose or fix. Just replacing the chip may not fix it, the new chip will likely blow as well.

 

[Patrick13770]

Okay cool thank you for all the good feedback.
I figured I would at least try a replacement chip first. Who knows, maybe it was bad from the factory.
I'll let you know how it turns out....

 

[Patrick13770]

Also....
I did disconnect the power supply from the main board, plugged it in and I'm getting 12v output.....