Redmi 10C Display Light Issue — Jumper Solution & Detailed Repair Guide
Stuck with a dark screen on a Redmi 10C? You might not need a new LCD — the backlight path on the motherboard can fail. This guide reveals the exact jumper points and step-by-step method technicians use to restore the display light quickly. Inside: symptoms, causes, micro-jumper technique, and safety precautions.
Symptoms: How to identify a backlight problem
- Phone boots (vibration/sound) but screen stays black or extremely dim.
- Under strong light you can barely see the GUI (shadow of icons) — touchscreen may still respond.
- Replacing the LCD doesn't bring back brightness — classic motherboard backlight fault.
What usually causes this?
- Broken copper trace or lifted trace on the backlight line.
- Burnt filter/coil or smd component in the LED driver path.
- Damaged backlight driver IC or solder pad corrosion from water damage.
- Connector fault / mechanical stress causing a micro-open in the trace.
Jumper solution — when & why to use it
A jumper is used when the backlight trace is open or a tiny SMD component is missing/damaged and immediate replacement is impractical. The jumper bypasses the damaged section and restores power to the backlight LEDs. It’s fast and effective, but should be done precisely.
Step-by-step jumper repair (recommended for experienced techs)
- Power OFF, remove battery (if removable) and disconnect all cables. Work on an anti-static mat.
- Open the phone and remove the motherboard carefully. Clean the board area with 90%+ IPA and a soft brush.
- Locate the jumper points shown in the picture (yellow dots highlight the two points to connect). Confirm continuity with a multimeter — you’ll usually see an open between these pads.
- Using a fine-gauge copper wire (36–40 AWG or enamel-coated wire), strip and tin the ends. Use a fine-tip soldering iron (200–350°C) and flux for minimal heat exposure.
- Bridge the pads with a short jumper wire, soldering gently to the designated pads. Keep the wire as flat as possible and avoid contact with nearby components.
- Inspect the solder joints under magnification for cold joints or bridges. Clean flux residues with IPA.
- Re-assemble partially and test powering the board (use battery/bench supply). If backlight returns, finish reassembly and test thoroughly.
Tools & materials
- Fine-tip soldering iron (temp-controlled)
- Thin copper/enamel wire (36–40 AWG) or silver paint for micro-jumpers
- Flux, 0.3–0.5mm solder
- Multimeter, magnifier or microscope, IPA
Precautions & best practices
- Do not use excessive heat — ICs around the jumper area are sensitive.
- If unsure, take high-resolution photos before touching the board so you can restore layout if needed.
- Jumper is often a temporary fix. For permanent reliability, replace the burned SMD component or the filter/coil if available.
- Observe ESD safety. Wear an ESD wrist strap when possible.
Troubleshooting — if jumper doesn't work
- If backlight still dead after jumper, the driver IC may be faulty — check surrounding components and power rails.
- Check integrity of FPC display connector and test with a known-good screen to rule out LCD faults.
- Inspect for corrosion that may short other lines — clean and retest.
Final notes
The jumper method is a valuable fast-repair technique for Redmi 10C backlight failures. When done with care, it restores functionality and buys time while sourcing replacement parts. Always weigh whether a board-level jumper is appropriate for long-term repair or only a diagnostic/temporary fix.
Continuity test: Probe 1 -> pad A Probe 2 -> pad B Expected: OPEN (broken) before jumper, continuity after jumper (low ohms)
