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In need of some assistance - faulty desk lamp

Ben Cooper

Nov 11, 2014
4
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Nov 11, 2014
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Hello

I have a small LED piano lamp which has a 5v dc input and a self locking switch (I think). There is a small pcb of which the mains lead pugs in to (assuming this is the power supply module) which also connects the battery leads to the LED circuit. I think that this pcb/power supply module is faulty however struggling to find a replacement. Everything I have found starts at a higher voltage e.g. 6.5-12v and has an output of 5v but I already have 5v dc at the power lead. Don't want to just bypass this module as assuming it protects the LEDs. Can anyone suggest where I might find a replacement, what it would be called and/or how I can fix this. The switch is a separate unit at the moment, linked with two leads inside the lamp base unit. The lamp is a stagg STLED 10.

Many thanks,

Ben
 

Arouse1973

Adam
Dec 18, 2013
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Dec 18, 2013
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5,178
Hello Ben
Can you take some pictures of the unit so we can have a look? Take nice clear close up pictures.
Adam
 

Ben Cooper

Nov 11, 2014
4
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Nov 11, 2014
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4
Hi Adam

Thanks. Yes, please see the following:

Ben
 

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Supercap2F

Mar 22, 2014
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Mar 22, 2014
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550
It appears that there is a black wire that has come unsoldered from the battery pack:
IMAG0272[1].jpg
Do you have a soldering iron so you could fix it?

The lamp should work when you plug it into the wall, but not when it's running on batteries if that's the only thing.
Dan
 

Ben Cooper

Nov 11, 2014
4
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Nov 11, 2014
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Hi Dan

Thanks for this. Unfortunately this is not the cause. I managed to detach this whilst fiddling. I am getting 5v dc at the power input and appears to be going to the switch. However, only 1v at the terminals for the LED circuit.

Thanks

Ben
 

Arouse1973

Adam
Dec 18, 2013
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Dec 18, 2013
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5,178
Hi Ben
Are there any components on the other side of the PCBs? What type of battery do you use, are they rechargeable types? Have you tried it with and without the batteries?
Adam
 

Ben Cooper

Nov 11, 2014
4
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Nov 11, 2014
Messages
4
Hi, yes, there is 1 small resistor and some very small flat square chip type components. It doesn't work on battery or mains. Just AAs. Pretty sure I just need to replace that little power module circuit board but it's obviously specifically manufactured for this lamp.

Many thanks
 

Gryd3

Jun 25, 2014
4,098
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Jun 25, 2014
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4,098
It doesn't work on battery or mains. Just AAs.
Can you please clear this up? Does this mean it does or does not work on batteries?

In your troubleshooting, are you referring to an external battery pack that you connect to the DC input where the mains adaptor goes?
 
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