Electronics > Repair

European Lamp in the US Stopped Working

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mgwalker95:
Hi,
I am having an issue with a dimmable lamp that I bought from a company in Europe (https://website-craft.s3.amazonaws.com/spec-sheets/Tradition-Montera-Table-Lamp-JH42-Spec-Sheet.pdf). When I first bought it, it worked fine for a couple of months but, the light will not come on anymore and I can't seem to figure out why it isn't working.

To power the lamp in the US I am using this step up converter DT-500VA and I am using these bulbs (https://www.amazon.com/PIFUT-Equivalent-Replacement-Incandescent-Candelabra/dp/B08P6TR9CF/ref=sr_1_5_pp). I have taken the lamp apart and can't seem to figure out what the issue could be.  I suspect that something is broken due to it working for a long time but all the components seem to be working that I have checked. It may be that the TRIAC is broken but I am not sure how to check that the TRIAC is working. Any help or ideas on what to check would be appreciated!

Items I have checked so far:
Replacing the bulbs
Step up converter: Multimeter is reading 240VAC
voltage Input to the PCB: 240VAC
Checked the input fuse and thermal fuse in the lamp: both read 0 Ohms
Output voltage with no lightbulbs(potentiometer slider High or low): 240VAC
Output voltage with lightbulbs(potentiometer slider High or low): 5VAC
Tried powering it with 120VAC, the lights still do not work.

step up converter: (https://www.amazon.com/LVYUAN-Voltage-Transformer-Converter-Universal/dp/B08TBQDGCD)

I have attached pictures of the PCB below.

IanB:
Well, the lamp is specified for 50 Hz.  In the USA you have 60 Hz. So there is a possibility that the circuit died as a result of prolonged use at the wrong frequency.

Another possibility is a low quality product that just failed because it failed.

I do not get why you linked to 110 V bulbs, when you are running the lamp through a step up converter at 240 V? Can you explain that? It is obvious that 110 V bulbs will fail on 240 V.

Furthermore, when the bulbs fail, they may take out the lamp electronics too.

Haenk:
Well, you are running a dimmer in combination with a LED branded "cheap as crap" - that's very thoughtful of you. Not.
Check the lamp with a regular 40W 230V bulb (no LED) first, or try to measure the output of the dimmer.
If you want to use LED, use a *branded* one (Osram, Philips, Paulmann) and use one that is spec'ed as "dimmerable" (that has a good chance of working, but still might not).

mgwalker95:
Thank you for the replies! I did realize that I picked the wrong bulbs when I looked into it so, I am getting some 240V bulbs to try. Why would the 110V bulbs have worked for a couple of months on 240V and then failed and other 110V not perform the same? Also what component would a bulb going out damage in the electronics?

Haenk:
If you have dimmed to 50%, that might leave enough room to survive for a bit, but it will eventually kill the LED anyway.
How long they will survive might be dependent on the components used (cheap stuff might use whatever is available cheaply on the market) and/or pure luck.
Likely cheap brands might even source devices from different manufacturers.

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