What could that be?

Krzysztof's picture

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Joined: May 10, 2020

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What could that be?
May 10, 2020 - 5:58am

Hello

It is a noob question. I am trying to repair my garden solar lights and they have a small very simple circuit with something that most likely is a voltage booster.

I tested the output produced from the system and it is only 0.5V or so which is obviously too little to power the LEDs. So for me, it looks like the booster is broken. I thought of replacing it but there is not a number on the part. Would you have an idea of what it could be? Picture attached.

Thank you

krzysIMG_8040.JPG

 

 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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What is the specification of the solar light? Input voltage? LED voltage or current?

The circuit uses an inductor, therefore this is may be a switching regulator used for LED. No capacitors are attached.

Could you provide the image of the PCB bottom.

Krzysztof's picture

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Thank you Sourav

Solar panel output is 5-6V and the battery is LiMH 1.2V.

LEDs switch on with more than 5V applied.

IMG_8041.jpg

BEst

 

Sourav Gupta's picture

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The IC number is QX5253. It is a switchable IC that requires three components only, an inductor, a LDR and one Resistor. This works with 2.5V LEDs.

 

The IC number is - QX5253. You can search google for more info.

 

This is my best guess.

Krzysztof's picture

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Hi

Thank you. But there are only two resistors and the solar panel there.

BEst

Krzys

Krzysztof's picture

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sorry one resistor and one inductor