Ga door naar hoofdinhoud

Repare the audio output of the Lunii - My Story Factory v1

Wat je nodig hebt

  1. Repare the audio output of the Lunii - My Story Factory v1, The right tools.: stap 1, afbeelding 1 van 3 Repare the audio output of the Lunii - My Story Factory v1, The right tools.: stap 1, afbeelding 2 van 3 Repare the audio output of the Lunii - My Story Factory v1, The right tools.: stap 1, afbeelding 3 van 3
    • STOP! Immediately drop that kitchen knife! Even if you've already opened tons of things with it, it's still not a screwdriver!

    • As a super handyman parent, you do have a real screwdriver hidden at the bottom of a drawer, but until you find it, I'll show you how it goes.

    • For this, I'm going to use a size 2 Phillips (or Phillips PH2) screwdriver. A 3.5 dish will do just fine, all this and being able to reach the screw without damaging the hull of our Lunii.

  2. Repare the audio output of the Lunii - My Story Factory v1, 4 screws, nothing more.: stap 2, afbeelding 1 van 2 Repare the audio output of the Lunii - My Story Factory v1, 4 screws, nothing more.: stap 2, afbeelding 2 van 2
    • Let's go ! We firmly hold our Story Factory in one hand and with the other we unscrew the 4 screws that come our way.

    • Make sure that the 4 screws are fully unscrewed by tilting the Lunii, they will fall out by themselves.

  3. Repare the audio output of the Lunii - My Story Factory v1, Inhale, pull!: stap 3, afbeelding 1 van 3 Repare the audio output of the Lunii - My Story Factory v1, Inhale, pull!: stap 3, afbeelding 2 van 3 Repare the audio output of the Lunii - My Story Factory v1, Inhale, pull!: stap 3, afbeelding 3 van 3
    • Then straighten the Lunii and hold the two top edges each with a thumb.

    • By gently spreading your fingers you should be able to open it without any resistance.

    • Hooray we made it! And a small interesting detail, the adhesive under the Lunii acts as a hinge.

  4. Repare the audio output of the Lunii - My Story Factory v1, Admire: stap 4, afbeelding 1 van 2 Repare the audio output of the Lunii - My Story Factory v1, Admire: stap 4, afbeelding 2 van 2
    • Next step: make an inventory of common failures and their solution!

  5. Repare the audio output of the Lunii - My Story Factory v1, Test the audio with headphones: stap 5, afbeelding 1 van 1
    • If the speaker is not working, try connecting headphones to the audio jack.

    • Any set of headphones will do, not just the official Lunii headphones.

    • If no sound still comes out, the problem is upstream of the amplification part, and this tutorial will likely be useless to you.

    • If sound comes out of the headphones, continue the investigation.

  6. Repare the audio output of the Lunii - My Story Factory v1, Test the speaker: stap 6, afbeelding 1 van 2 Repare the audio output of the Lunii - My Story Factory v1, Test the speaker: stap 6, afbeelding 2 van 2
    • Disconnect the battery.

    • Measure the resistance between the speaker terminals; it should be around 3 ohms.

    • If the resistance is too large, the speaker is probably damaged.

  7. Repare the audio output of the Lunii - My Story Factory v1, Test the potentiometer and the headphone jack: stap 7, afbeelding 1 van 1
    • Turn the potentiometer to the maximum volume.

    • With a multimeter, measure the resistance between the two pins (audio in and audio out) at the bottom, as indicated in the photo.

    • If the resistance is high (in the order of a megaohm) or infinite, the potentiometer and audio jack daughter board are the problem.

    • If possible, replace the daughter board.

    • The problem may be from a blocked contact inside the audio jack, which can be unblocked with isopropyl alcohol (see this forum for more information).

    • If the resistance is fine, the next step describes a hack to work around the problem.

  8. Repare the audio output of the Lunii - My Story Factory v1, Workaround for the sound issue: stap 8, afbeelding 1 van 3 Repare the audio output of the Lunii - My Story Factory v1, Workaround for the sound issue: stap 8, afbeelding 2 van 3 Repare the audio output of the Lunii - My Story Factory v1, Workaround for the sound issue: stap 8, afbeelding 3 van 3
    • Insert a through-hole resistor of 1 kOhm or similar into the last two pins of the connector, as shown in the picture.

    • Reconnect the battery and test the sound and volume control.

    • If this fixes the audio issue, solder the resistor in place.

    • In my case, I used a 1 kOhm 0402 resistor recovered from a broken circuit board. The ideal resistor would be in the 0805 format.

    • Solder the resistor between the two areas highlighted in pink in the picture.

    • With this method, connecting headphones will no longer automatically turn off the main audio output. To fix this, you must disconnect the speaker cable.

  9. Repare the audio output of the Lunii - My Story Factory v1, Change the amplifier: stap 9, afbeelding 1 van 2 Repare the audio output of the Lunii - My Story Factory v1, Change the amplifier: stap 9, afbeelding 2 van 2
    • Desolder the amplifier, which is highlighted in orange in the picture.

    • To desolder this component with only one soldering iron, bridge all of the pins on one side with solder and heat it with the iron. Once the solder is melted, lift that side of the component up. Repeat this technique on the other side of the part to remove it completely.

    • Reconnect the battery, turn the potentiometer to on, and test the voltage between GND and VBAT. This should be the same value as the battery voltage, between 3.7 and 4.2 V.

    • If possible, play an audio file and use an oscilloscope or a multimeter to verify that a signal is present on the audio input pin, as indicated by a blue arrow in the picture.

  10. Repare the audio output of the Lunii - My Story Factory v1, Solder on a new amplifier: stap 10, afbeelding 1 van 2 Repare the audio output of the Lunii - My Story Factory v1, Solder on a new amplifier: stap 10, afbeelding 2 van 2
    • Order a TI LM4871MX from your preferred electronic distributer.

    • Clean the contacts and resolder the new component.

Conclusie

To reassemble the device, follow the instructions in reverse.

Met dank aan deze vertalers:

fr en

100%

EHaga7 helpt ons de wereld te herstellen! Wil je bijdragen?
Begin met vertalen ›

Eve Redero

Lid sinds: 02/28/22

2.436 Reputatie

10 handleidingen geschreven

Één opmerking

La carte fille comportant la prise jack s'appelle "module son" chez Lunii et le SAV peut en envoyer gratuitement.

Hadrien - Antwoord

Voeg opmerking toe

Weergavestatistieken:

Afgelopen 24 uren: 4

Afgelopen 7 dagen: 39

Afgelopen 30 dagen: 141

Altijd: 1,046