By Refitec | Expert TV Repair & LG TV Service Center Near You
📞 Call or WhatsApp: 0704843613
⚡ Quick Answers — Jump to Your Problem
| # | Problem | Quick Fix |
|---|---|---|
| 1 | Blank/black screen with sound | Power cycle the TV & check backlight |
| 2 | Wrong input source selected | Press INPUT/SOURCE and switch to correct HDMI port |
| 3 | Loose or faulty HDMI/cable connection | Reseat or replace HDMI cable |
| 4 ** | ** Backlight failure | Requires professional backlight repair — Call Refitec |
| 5 | Mainboard or T-Con board failure | Requires professional board repair — Call Refitec |
🔧 Can’t fix it yourself? Refitec is your trusted LG TV service center near you. Call or WhatsApp: 0704843613
Reason #1: The TV Needs a Simple Power Reset
Quick Fix
Unplug your LG TV from the wall for 60 seconds, then plug it back in.
Detailed Steps
Many cases of “LG TV sound but no picture” are caused by a temporary firmware or power glitch. A hard power reset clears the TV’s internal memory and restores normal display operation.
How to do it:
- Turn off your LG TV using the remote.
- Unplug the power cable from the wall socket — do NOT just use the remote standby button.
- Wait a full 60 seconds (not 10 — the capacitors need time to discharge).
- Press and hold the physical power button on the TV (not the remote) for 10 seconds while it’s unplugged.
- Plug the TV back in and turn it on.
Still not working? The issue is likely hardware-related. Move to the next reason below or contact Refitec.
Reason #2: Wrong Input Source Selected
Quick Fix
Press the INPUT or SOURCE button on your remote and select the correct HDMI or AV input.
Detailed Steps
Your LG TV may be outputting audio from one source while displaying a blank screen from another. This is one of the most common — and most overlooked — causes of the “sound but no picture” problem.
How to fix it:
- Press the INPUT or SOURCE button on your LG remote.
- A menu will appear showing all available inputs: HDMI 1, HDMI 2, AV, Component, etc.
- Use the arrow keys to scroll through each input.
- Select the input where your device (cable box, streaming stick, game console) is connected.
- If you see a picture on any input — the problem was just the source selection.
Pro Tip: If your LG TV shows a “No Signal” message on the correct HDMI port but you have sound, the connected device may be the issue — try a different HDMI cable or port.
Reason #3: Loose, Damaged, or Faulty Cable Connection
Quick Fix
Unplug and firmly reseat all cables connected to your LG TV — especially HDMI cables.
Detailed Steps
A loose or damaged HDMI or AV cable can carry audio signal while failing to transmit video signal, resulting in sound but no picture on your LG TV.
How to fix it:
- Turn off both your LG TV and the connected device (cable box, laptop, decoder, etc.).
- Unplug the HDMI cable from both ends — the TV and the source device.
- Inspect the cable ends for bent pins, debris, or visible damage.
- Firmly plug the cable back in on both ends — you should feel/hear a click.
- Turn both devices back on.
- Try a different HDMI cable if available — cables can fail internally without visible damage.
- Try a different HDMI port on the TV (e.g., switch from HDMI 1 to HDMI 2).
If the problem persists with multiple cables and ports, the issue is likely internal — proceed to Reason #4 or call Refitec on 0704843613.
Reason #4: LG TV Backlight Failure (Most Common Hardware Fault)
Quick Fix
Shine a bright torch/flashlight at your LG TV screen in a dark room. If you can faintly see an image, your backlight has failed — this requires professional repair.
Detailed Steps
The backlight is the set of LED strips behind your LG TV’s LCD panel that illuminate the image. When the backlight fails, the panel still produces a picture — but it’s invisible to the naked eye. The audio system runs independently, so you still hear sound perfectly.
How to confirm backlight failure:
- Turn on your LG TV and ensure it’s on the correct input.
- Go into a dark room.
- Shine a bright flashlight or phone torch very close to the screen at an angle.
- Look carefully — can you see a faint, dim image of what should be displayed?
- If yes — your LG TV backlight has failed.
What causes LG TV backlight failure?
- Burnt-out LED strips (common in LG TVs after 3–5 years of use)
- Faulty backlight driver on the power board
- Surge damage from power fluctuations
⚠️ This repair requires disassembling the TV panel and replacing LED strips. Attempting this without proper tools and expertise can permanently damage your screen.
🔧 Refitec specialises in LG TV backlight repair. We source genuine and compatible LED strips for all LG TV models. Call or WhatsApp: 0704843613
Reason #5: Mainboard or T-Con Board Failure
Quick Fix
If none of the above steps work, your LG TV likely has an internal board failure — mainboard or T-Con board — which requires professional diagnosis and repair.
Detailed Steps
Your LG TV contains several key internal boards. Two of the most common culprits when you have sound but no picture are:
The T-Con (Timing Control) Board:
- Controls the timing signals that drive your LCD panel
- When it fails: the panel stays black even though the rest of the TV works perfectly
- Sound continues because the mainboard is still functioning
The Mainboard:
- The brain of your TV — processes video, manages inputs, and communicates with the display
- A partial mainboard failure can knock out video while leaving audio intact
Signs it’s a board issue (not backlight):
- Flashlight test shows NO faint image at all (rules out backlight)
- TV worked fine then suddenly went black after a power surge
- Screen flashes briefly at startup then goes dark
- You’ve already replaced cables and ruled out input/source issues
What Refitec does:
- Full diagnostic to identify the exact faulty component
- T-Con board repair or replacement
- Mainboard repair or component-level soldering
- Testing before return to ensure full picture restoration
⚠️ Board repairs require expert electronics skills and proper equipment. Do not attempt to remove or swap boards without professional guidance — incorrect handling can destroy your TV permanently.
🛠️ When to Call a Professional LG TV Service Center
If your LG TV has sound but no picture and:
- The power reset didn’t help ✗
- You’ve confirmed the correct input source ✗
- You’ve tested multiple HDMI cables and ports ✗
- The flashlight test confirms backlight failure ✗
- Or you see no image at all even with a flashlight ✗
…it’s time to call the experts.
📍 Refitec — Your Trusted LG TV Service Center Near You {#contact}
At Refitec, we specialise in diagnosing and repairing all LG TV models — from OLED to NanoCell to standard LED panels. Whether it’s a backlight replacement, T-Con board repair, or mainboard fix, our certified technicians get your screen back to life fast and affordably.
Why choose Refitec?
- ✅ Experienced LG TV repair technicians
- ✅ Genuine & compatible spare parts
- ✅ Fast turnaround time
- ✅ Transparent pricing — no hidden costs
- ✅ Serving customers across the region
📞 Book a Repair or Get a Free Quote Today
Call or WhatsApp: 0704843613
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