Hi all,
I have purchased a while ago a powerboard that includes a very handy dual LED light. It worked for a while then started to not turn on in summer (but worked in winder) and eventually blew up. I opened up the case - the two LED lights are on the edges of the powerboard and the power adapter is housed in the left hand side together with the left LED PCB and reflector. I measured the voltage required for the LEDS and the amperage - 9V 0.5A.
So I got one of those cheap SMPS 9V 1A off Ebay (I am using these in all my webcams 24/7 with no problems for years) took the pcb out of the case and soldered the connections to it. All good - I put it back. After only 2 weeks or intermittent use, bang. I opened the case - the high voltage part was at fault, 2 of the 4 rectifier diodes blown and a transistor (swtching transistor? no idea about SMPS unfort) and a resistor - oh yes and the fuse. Before blowing the SMPS was emitting a high pitched noise (for a few days).
SO I thought - must have been a defective power supply. I put in another of the same type. This time it only lasted a few hours! Now granted, it is quite hot and humid here and the case is quite tight - however the whole thing didd nto seem to get excessively hot in operation. This time, the same area was damaged ie diodes, transistor and a resistor - the fuse was Ok.
I wonder - what is going on? There is no short in the LEDs, I mean the fuse woudl blow and that would be it? Could it just be the heat?
I am aiming to get another 9V SMPS and this time put in outside the whole case - it will be messy and ugly, but I'd like to try it outside, see if it blows again.
I have a regulated protected bech supply too, maybe hook it up to the LEDS for extensive time, see what happens?
I can probably repair the blown SMPS-es but have no idea what transistor that may be - and the resistor. The SPMS is cheap - $4AUD - but it takes time to arrive from China (now its NY as well there) and it is very annoying to create so much waste also...
Any idea would be appreciated, thank you. Ill try to put up some photos..
I have purchased a while ago a powerboard that includes a very handy dual LED light. It worked for a while then started to not turn on in summer (but worked in winder) and eventually blew up. I opened up the case - the two LED lights are on the edges of the powerboard and the power adapter is housed in the left hand side together with the left LED PCB and reflector. I measured the voltage required for the LEDS and the amperage - 9V 0.5A.
So I got one of those cheap SMPS 9V 1A off Ebay (I am using these in all my webcams 24/7 with no problems for years) took the pcb out of the case and soldered the connections to it. All good - I put it back. After only 2 weeks or intermittent use, bang. I opened the case - the high voltage part was at fault, 2 of the 4 rectifier diodes blown and a transistor (swtching transistor? no idea about SMPS unfort) and a resistor - oh yes and the fuse. Before blowing the SMPS was emitting a high pitched noise (for a few days).
SO I thought - must have been a defective power supply. I put in another of the same type. This time it only lasted a few hours! Now granted, it is quite hot and humid here and the case is quite tight - however the whole thing didd nto seem to get excessively hot in operation. This time, the same area was damaged ie diodes, transistor and a resistor - the fuse was Ok.
I wonder - what is going on? There is no short in the LEDs, I mean the fuse woudl blow and that would be it? Could it just be the heat?
I am aiming to get another 9V SMPS and this time put in outside the whole case - it will be messy and ugly, but I'd like to try it outside, see if it blows again.
I have a regulated protected bech supply too, maybe hook it up to the LEDS for extensive time, see what happens?
I can probably repair the blown SMPS-es but have no idea what transistor that may be - and the resistor. The SPMS is cheap - $4AUD - but it takes time to arrive from China (now its NY as well there) and it is very annoying to create so much waste also...
Any idea would be appreciated, thank you. Ill try to put up some photos..
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