Aller au contenu principal

Réparez vos affaires

Droit à la réparation

Boutique

Introduction

This is an example of an iPhone XS Max abnormal screen display problems caused by a rare mistake-someone soldered the wrong boards together.

Vidéo d'introduction

  1. Connect an iPhone XS Max display assembly with the motherboard and connect the battery connector with the DC Power Supply.
    • Connect an iPhone XS Max display assembly with the motherboard and connect the battery connector with the DC Power Supply.

    • Get the motherboard powered on with tweezers. We can see that the screen comes with abnormal display and the boot current is larger than normal value. However, the phone can access the activation screen.

    • Judging by this, the display problem is probably related to the display circuit, the GPU circuit or the third space PCB.

  2. Let’s check the display circuit first. Run diode mode measurement of the display connector J5700. The measured value is normal. So the display problem has nothing to do with the display circuit.
    • Let’s check the display circuit first. Run diode mode measurement of the display connector J5700. The measured value is normal. So the display problem has nothing to do with the display circuit.

    • Next, we need to check the GPU circuit.

  3. Le kit d'outils Essentiel

    Les outils les plus utiles dans notre kit le plus compact.

    J'achète

    Le kit d'outils Essentiel

    Les outils les plus utiles dans notre kit le plus compact.

    J'achète
  4. We need to separate the motherboard before the test. Place the motherboard on the specialized Heating Platform. 3 minutes later, pick up the upper layer with tweezers and then the lower layer.
    • We need to separate the motherboard before the test. Place the motherboard on the specialized Heating Platform. 3 minutes later, pick up the upper layer with tweezers and then the lower layer.

  5. Connect the iPhone XS Max display assembly with the upper layer and connect the battery connector with the DC Power Supply. Get the upper layer powered on with tweezers. The problem remains the same.
    • Connect the iPhone XS Max display assembly with the upper layer and connect the battery connector with the DC Power Supply. Get the upper layer powered on with tweezers. The problem remains the same.

    • Which indicates that the display problem has nothing to do with the third space PCB.

  6. We need to continue with the GPU circuit.
    • We need to continue with the GPU circuit.

    • Attach the upper layer to the PCB Holder. Open REFOX and find the GPU circuit of iPhone XS Max.

    • Compare the upper layer we are dealing with and the one on the bitmap, we find that the one we are dealing with is an iPhone XS upper layer not an iPhone XS Max upper layer as described. This is obviously a rare case that you will likely never see in real life.

  7. Try to connect an iPhone XS display assembly with the upper layer and connect the battery connector with the DC Power Supply.
    • Try to connect an iPhone XS display assembly with the upper layer and connect the battery connector with the DC Power Supply.

    • Get the upper layer powered on with tweezers. The phone turns on normally with normal display. The phone can access the activation screen and the boot current is also normal this time.

    • We can confirm now that our client soldered an iPhone XS upper layer onto an iPhone XS Max lower layer and resulted in the abnormal screen display.

Phryne

Membre depuis le 17/11/2019

14 826 Réputation

80 tutoriels rédigés

Nice your post

It Bd44 - Réponse

Thanks for watching!

Phryne -

Ajouter un commentaire

Afficher les statistiques:

Dernières 24 heures : 4

7 derniers jours : 42

30 derniers jours : 179

Total : 1,733