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Emergency lights

lamp lantern problem 50W. Burnt component

Arlequin2013

hace 5 años

Dear: The attached image shows the Led Lamp that I am trying to repair. It is 50W Candil brand. When I opened it I had a component burned in series with one of the 220V cables (F11 bottom right). It seemed to be a resistance for the packaging of the component, so replace it with a resistance of the value that seemed to indicate the bands (1 ohm) but they always burn. Use 1/2 Watt resistors. I have 3 lanterns in the same conditions. From what I saw on the internet there are fuse resistors and I am wondering if this may be the case. Try to find some info about bluff but I didn't find anything. The rest of the circuit does not seem to be bad, there are no overheating marks on any component and when I test them the LEDs light up until the resistors are burned (1/4 of a second, no more). Any suggestion is welcome.

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Ricardo Ab.

5.181

hace 5 años

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hace 5 años

Hi If the silkscreen indicates F11, it is clearly not a resistance. It would be a fuse If it burns it is because there is a short circuit. First control the diode bridge and then the transistors My doubt is that bands had the supposed "resistance" regards

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JOSE MIGUEL SIRGO PASCUAL

6.953

hace 5 años

The procedure to follow is as follows:
Bypass the F11, place a 500w incandecent lamp in series with the 220-volt power input of the mains and measure the current consumed by the device with an ammeter clamp.
With this reading, calculate the watts consumed and it will be known if there is an excessive consumption that indicates an anomaly in the circuit.
This procedure is valid for when you want to repair any device that blows the fuses.

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Arlequin2013

hace 5 años

A series lamp, of course. Not being a professional repairman this was completely overlooked. I am going to put into practice this end of seamana I tell you the results.

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Arlequin2013

hace 5 años

Use the lamp and there is indeed something short because the lamp turns on. Not 100% but it turns on a lot and the led lamp doesn't even mosque. Now a process will begin to see which component is the one that is short.
Thanks for the help.

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Arlequin2013

hace 5 años

Dear: Thank you for your answers. I will use the serial lamp and control diodes and transistors. I upload photos of the burned components. These are the ones that you remove from the PCB with the symbol F11.