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Replace faultly digit

Introduzione

Digits are enlighted by leds. After a while, some led intensity decrease or goes into short circuit. Let see how to replace the led.

  1. Replace faultly digit, Display digit: passo 1, immagine 1 di 3 Replace faultly digit, Display digit: passo 1, immagine 2 di 3 Replace faultly digit, Display digit: passo 1, immagine 3 di 3

    • Unplug the power supply from the wall, remove batteries.

    • Unscrew x7 and open the device by unlocking the plastic clip on the bottom face.

    • On the rear of the display panel, unscrew x2 and unclip the flat cable.

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  2. Replace faultly digit: passo 2, immagine 1 di 3 Replace faultly digit: passo 2, immagine 2 di 3 Replace faultly digit: passo 2, immagine 3 di 3

    • We want to separate the digit support from the PCB to access the leds.

    • On the back, mill the white clips to free the PCB from the digit support. I used a Dremel like tool.

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  4. Replace faultly digit: passo 3, immagine 1 di 2 Replace faultly digit: passo 3, immagine 2 di 2

    • You can test the leds by plug in the flat cable. Be carefull of high voltage.

    • In my case, I had to replace the 2B led. Locate the green mark before unsoldering the led. Green mark goes to the driver chip.

    • To buy leds, search Internet with key words : white led smd 0603

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    • Once done, you can try the led fix and reassemble the device.

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Conclusione

Pour réassembler votre appareil, suivez les instructions dans l'ordre inverse.

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