Hello
I'm trying to repair a mains adapter for a well known LED light company which has stopped working 2 years from purchase. It's a switching power supply, input 100-240v 47-63Hz AC, 0.1A. Output 4v 100mA DC.
Opening up the device it was quickly apparent that two of the electrolytic capacitors had burst (E-Cap +-20% 3.3uF 8x12mm 400V).
Having replaced the obviously leaking caps I still cannot get a voltage reading from the output plug.
There are two more E Caps that I can see, but they don't look like they've burst. Are they to be suspected more then any other part of the circuit?
Also why do computer circuit boards last decades yet PSU conk out after two years? Do they use some special E Caps that have superior reliability? The PSU does look like it's been thrown together with all the bare wires topside.
I'm trying to repair a mains adapter for a well known LED light company which has stopped working 2 years from purchase. It's a switching power supply, input 100-240v 47-63Hz AC, 0.1A. Output 4v 100mA DC.
Opening up the device it was quickly apparent that two of the electrolytic capacitors had burst (E-Cap +-20% 3.3uF 8x12mm 400V).
Having replaced the obviously leaking caps I still cannot get a voltage reading from the output plug.
There are two more E Caps that I can see, but they don't look like they've burst. Are they to be suspected more then any other part of the circuit?
Also why do computer circuit boards last decades yet PSU conk out after two years? Do they use some special E Caps that have superior reliability? The PSU does look like it's been thrown together with all the bare wires topside.