If your Vivo Y36 5G is turning on with no display light, dim light, or black screen with sound, then you are facing the LCD Backlight Problem.
This post gives you the 100% Working Vivo Y36 5G LCD Light Solution, including backlight jumper ways, LED line repairs, filter/coil checking, and practical technician tips.

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✔ Common Symptoms of Vivo Y36 5G Backlight Problem

  • Mobile turns ON but no display
  • Screen shows very dim light
  • You can hear sound/vibration but screen stays black
  • Flashlight works but display does not
  • After water damage, display goes completely dark
  • LCD changed but still no backlight

❗ Before Doing Any PCB Work – Try These Steps

  1. Clean display connector with IPA (Isopropyl Alcohol)
  2. Try another original LCD
  3. Check for shorts in display connector
  4. Inspect board for corrosion or burnt components

If still not fixed → Continue with the hardware solution below.

🔧 Vivo Y36 5G LCD Light Hardware Solution

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The backlight system includes:

  • LED Positive Line (+)
  • LED Negative Line (−)
  • Backlight Filters / Coils (L)
  • Backlight Diode
  • Backlight IC / PMIC Section
  • Display Connector

If any of these fail → LCD light will not work.

✔ Step-By-Step Backlight Repair Guide

1. Check Backlight LED Lines

Using a multimeter:

  • Check continuity of backlight + and –
  • If line is broken → apply jumper ways (diagram above)

2. Test Backlight Diode

  • Replace if shorted or open
  • A faulty diode causes no display light even if the phone boots

3. Check Backlight Filters/Coils

Look for:

  • Burnt coil
  • Loose coil
  • Broken coil

Replace from donor board if needed.

4. Reheat or Replace PMIC Backlight Section

This area commonly fails after:

  • Water damage
  • Short circuits
  • Wrong charger usage

If PMIC output is missing → the backlight will not turn on.

⭐ Vivo Y36 5G Display Connector Pinouts & Jumper Ways

Use jumper wires if:

  • Track is burnt
  • Connector pad is missing
  • No voltage on backlight pins

Always use thin insulated jumpers to avoid shorting nearby pads.

⚠ Safety Tips

  • Never apply direct battery voltage to display pins
  • Keep heat below 350°C when working near ICs
  • Use flux when soldering jumpers
  • Test display before reassembling

📌 Causes of Vivo Y36 5G Backlight Not Working

  • Dropping the phone
  • Water damage / liquid entry
  • Cheap charger causing PMIC failure
  • Fake LCD installation
  • Burnt backlight coil
  • Damaged display connector

🛠 Required Tools for Repair

  • DC Power Supply
  • Multimeter
  • Hot Air Station
  • Microscope (optional but helpful)
  • Soldering iron
  • Jump wire
  • Flux + IPA

📚 Frequently Asked Questions (FAQ)

1. Why Vivo Y36 5G display is on but no light?

Because the backlight circuit is faulty — common causes include a burnt coil, bad diode, or broken jumper line.

2. Can replacing the LCD fix backlight issues?

Only if LCD backlight LEDs are damaged.
If not, the issue is on the motherboard.

3. Is jumper safe for backlight repair?

Yes, but use thin wires and avoid touching other pads.

4. Does software cause display light problems?

No. Backlight issues are 100% hardware related.