Its a surface mount 5 pin IC , it has BFO0 written on it, on a board from a Tasco trail camera.
U6-U7

 

 

 

en25qh16b-104hip

 

en25qh16b-104hip

That's the part number for U4 a flash memory IC , looking for info on U6-U7, my hunch is thats its either a dual transistor switch or a voltage regulator.

 

U6,7 are PWM power supplies. See the inductor and capacitors, wide traces.

 

Look up Torex Semiconductor XC6101-XC6105, XC6111-XC6117series.
Possibly XC6115.

 

XC6xxxx are voltage detectors. the ICs used here are switching regulators. there is plenty of products in SOT23-5 that could fit the bill so not sure what the used ICs are. seem to be SOT23-5 package.

 

The first post is asking for information with no hint as to which sort of information. What is the purpose? To understand the camera or to repair it?? or something else????

 

Switching regulator it is. The PCB layout matches the circuit schematics in post #8.

 

The first post is asking for information with no hint as to which sort of information. What is the purpose? To understand the camera or to repair it?? or something else????

Yes I was going to attempt to repair it initially but on closer inspection I noticed that the board itself has some corrosion on it. Water or battery chemicals must have made its way onto the board surface. So I'm thinking it's not repairable.

 

XC6xxxx are voltage detectors. the ICs used here are switching regulators. there is plenty of products in SOT23-5 that could fit the bill so not sure what the used ICs are. seem to be SOT23-5 package.

View attachment 332677
View attachment 332676

Yes PM it appears to be a SOT23-5 package, the pin assignment looks to be a match. The input voltage to U6 is +6.23 from the battery pack, the output voltage is +3.27, this voltage also appears on the common pin of the power switch (sw2), yet the unit will not turn on ?

 

Yes I was going to attempt to repair it initially but on closer inspection I noticed that the board itself has some corrosion on it. Water or battery chemicals must have made its way onto the board surface. So I'm thinking it's not repairable.

The first thing to do is to clean off the corrosion with isopropyl alcohol and a soft brush.

 

Some corroded PCBs are repairable, some are not. And the amount of effort that should be taken depends entirely on the cost of any alternative choices. Non-TV remotes for which there is no possible replacement available may get a lot more effort .

 

The first thing to do is to clean off the corrosion with isopropyl alcohol and a soft brush.

The traces on this double-sided board are very small and the components are all surface mount types , the voltage regulators that i thought might be the problem turned out to be ok , so the board has other issues . After some thought i've decided not to pursue the repair any further. It belongs to my brother in-law, he has several of these cameras and they are $28 a pop.
Thanks tho.

 

Some corroded PCBs are repairable, some are not. And the amount of effort that should be taken depends entirely on the cost of any alternative choices. Non-TV remotes for which there is no possible replacement available may get a lot more effort .

I have to agree Bill, its a cheapish $28 camera ( he has several ) and ive decided not to pursue it any further.
Thanks for replying.

 

Really, though, making a detail examination of the PCB will be educational no matter if you try to repair it or not. Closely examining a fine-line PCB provides an education as to where lines can fail, and what failed solder joints can look like. That knowledge, in turn, will provide insights for future PCB inspections.
Also, if you spot a failed connection and are able to repair it, definitely a bit of improved ability. And keeping something out of a landfill.

 

If you have multiple units of this board that helps with the trouble shootong. Measure voltages and compare against a working board.

 

Of course, without a circuit and understanding how something works, all you are doing is checking for failed parts. That is not a very efficient way to service anything.
Of course, with some products, even when you know exactly what part has failed, no repair is possible because no replacement parts can be acquired.

 

Of course, without a circuit and understanding how something works, all you are doing is checking for failed parts. That is not a very efficient way to service anything.
Of course, with some products, even when you know exactly what part has failed, no repair is possible because no replacement parts can be acquired.

Agree , also like to add that if this were to be a paid job the cost could easily exceed the cost of the unit, especially as you say with no schematics and trouble shooting guides.