Here is a a close up of the OZ99xx chip and the transistors.
Are those holes on the transistors??? They all look the same except for one that doesn't seem to have a hole in the "dot" of the marking.
Nobody has apparently commented on this yet -- but yes, that does look like holes burnt into the SOT-23 package to me. While I have not personally seen this in SOT-23 transistors, I have encountered SOIC packages with very similar-looking small holes after they had let out the magic smoke. Given the fact that more than one transistor is affected, some other root cause has probably triggered their failure.
Or am I misinterpreting this? Has anyone come across similar "holes" which were benign?
The LED driver board was confirmed to be operational and the transistors were confirmed to be working as well .
I'm glad I'm not the only one wondering about theses. Gotta admit it's strange to find what looks like holes on top of transistors. BUT it's true that the driver works, I was able to light the whole panel in a very bright white and Jwillis says the transistors reading I took looked good so I guess it's either normal or some form of aging that is not critical yet?
About the M.NT68676.2A controller, I was looking at the exact same one. I was finally able to find a seller that understood what I was talking about and he sent me a document (attached) with specifications, schematics and pin out info.
He has a compatible LED driver for me but their controller board requires an external 12v 4A power source and I would rather keep it internal.
If I find 12v on the current power supply can I just connect to it to power their controller?
If not is it OK to power it using a step down circuit from eBay on the 18v line to the driver board?
I also wonder if their LED driver will be as bright as the current one.
Preserving the current PS would make it easier to use the original driver, using an external PS would require stepping up the 12v to 18v for the driver.
Also, are we sure the "DIM" signal from the new controller is the same as the original "BRI" signal? Same thing for the ON/OFF signal.
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