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Fried pcb for led lamp

Joni

Feb 14, 2023
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Ceiling lamp pcb got fried after it was installed incorrectly. cables from out end of transformer, were plugged in red to black and black to red.
The lamp has a panel and rgb led strips. It aslo coes with a controler.

I think all I have to do is replace the voltage regulator that got fried.
6D92F9D5-D9E0-40B8-A7D1-7EA356E3475C.jpegF8B840B4-C07B-4113-9C90-A76A290C331D.jpeg
As seen on the pictures above I removed the capacitor that was covering the burnt component.51B6A5C6-529E-405B-A42A-07CAA4628E7A.jpeg
I also removed the glue
1C679619-15DE-4C0C-A93B-086F75765057.jpeg
I can Identify the component as a SOT89 78L…. Rest is missing
I think it’s a voltage regulator.
But I have no Idea what voltage I need .
Here is another picBDEA5DCF-FBDD-4284-A427-3042AC7E0A80.jpeg
 

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Harald Kapp

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Possibly a 78L05 (5 V regulator) or 78L03 (3.3 V regulator).
Could be either one, the CPU HT66F018 can operat between 2.2 V and 5.5 V, so that is inconclusive. I'd start with the 3.3 V regulatro and switch to 5 V if 3.3 V doesn't work.

On the other hand, you're lucky if it is really only the voltage regulator, not more.
 

kellys_eye

Jun 25, 2010
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The diode at the bottom of the last picture is also likely shorted.
 

Joni

Feb 14, 2023
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Big thanks for the replies, I’ll try to get a hold of the components. Might take a few months though, since ali express is the only place I was able to find the VRs…
 

kellys_eye

Jun 25, 2010
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since ali express is the only place I was able to find the VRs…
There are many suppliers such as Farnell, RS Components, Mouser etc that stock those items. Most countries have outlets too.
 

kellys_eye

Jun 25, 2010
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If the pinout matches and the technical spec do as well then float your boat!
 

Joni

Feb 14, 2023
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Could you help picking the right diode to replace the one in the picture? I wanna add it to the order incase it’s broken too.
I’ve been trying to figure this stiff out on my own, but I’m not that well versed in this stuff
 
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