---
product_id: 181510562
title: "TKDMR LED Lamp Bead TV Backlight Tester - for All LED Lights Repair Output 0-300V (0-300V 30mA)"
brand: "tkdmr"
price: "€ 37.93"
currency: EUR
in_stock: true
reviews_count: 10
category: "Tkdmr"
url: https://www.desertcart.de/products/181510562-tkdmr-led-lamp-bead-tv-backlight-tester-for-all-led
store_origin: DE
region: Germany
---

# 0-300V output voltage Compact 3.7x2.1x1.1 inch size 30mA working current TKDMR LED Lamp Bead TV Backlight Tester - for All LED Lights Repair Output 0-300V (0-300V 30mA)

**Brand:** tkdmr
**Price:** € 37.93
**Availability:** ✅ In Stock

## Summary

> 🔧 Diagnose LED TV backlights like a pro — fast, safe, and foolproof!

## Quick Answers

- **What is this?** TKDMR LED Lamp Bead TV Backlight Tester - for All LED Lights Repair Output 0-300V (0-300V 30mA) by tkdmr
- **How much does it cost?** € 37.93 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/181510562-tkdmr-led-lamp-bead-tv-backlight-tester-for-all-led)

## Best For

- tkdmr enthusiasts

## Why This Product

- Trusted tkdmr brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Time & Cost Saver:** Pinpoint faulty LEDs in seconds without disassembling panels or wasting batteries.
- • **Safety First Design:** Double isolation and no-spark testing ensure zero electric shock risk during use.
- • **Pocket-Sized Powerhouse:** Compact, lightweight, and ready for on-the-go professional repairs.
- • **Universal Compatibility:** Works seamlessly with any LED TV backlight size or panel for quick diagnostics.
- • **Precision Voltage Control:** Adaptive 0-300V output with soft start protects your LEDs from damage.

## Overview

The TKDMR LED Lamp Bead TV Backlight Tester is a compact, professional-grade tool designed to safely and accurately troubleshoot LED TV backlight issues. Featuring an adaptive 0-300V output with 30mA current and double isolation safety, it quickly identifies faulty LEDs without damaging components. Ideal for technicians and DIYers, it saves time and money by eliminating guesswork and the need for multiple batteries or panel disassembly.

## Description

TV backlight problems are getting increasingly common. As we know, slight voltage change can have a big influence on TV function.This LED Lamp LED TV Backlight Tester can find defective LED on the strip in few seconds because of automatically adjust the voltage level and current. This LED tester can save your time to find the TV which back light is defective.It is really a good tool for Every Technician. If there is something wrong with LED strip, you can change it or replace the bad LED beads. Applicable to any size LED TV , perfect backlight inspection and maintenance tool ! Model: TD2B Input Voltage:AC 110-265V (International General) Output Voltage :0-300V (Adopt soft start mode, the voltage slowly increases.After power on, the voltmeter needs to wait for a few seconds to display the normal 300 value.) Output Current:30mA Main Application: - Suitable for single LED beads, LED stirng, LED panel and Integrated optical LED - Support testing the capacitance voltage and the diode voltage - No need to disassemble panel to test the LED strips which can save a lot of time for you. - Safe Protection: Double Isolated - Burn protection: Voltage and Current Intelligent Adjustment. - Safety design : Slow boost , soft start. Increase the current steadily. How to operate this LED Lamp LED TV Backlight Tester? 1. Plug in power, it would be cost about 3 to 5 seconds to start 2. The soft start mode make the backlight getting brighter gradually 3. If you can't make sure which is"+"and "-", then not test for a long time 4. Don't touch the output terminal of probes for a long time 5. Retardancy materials: Double Isolate Design makes tester safety with high strength and flame What's in the box 1*Tester 1*User manual 1Pair*Test probe 1*US Power Plug

Review: Right tool for the job. More economical in the long run than a series of 9V batteries. - I have seen quite a few online videos and instructions on how to test LED TV backlights using 9V batteries instead of a “costly tester”. Unfortunately, testing LED TV backlights with 9V batteries is not as economical as it may seem. At 3V per LED, testing a strip of 6 LED would require at least two 9V batteries. Testing an array of twenty LEDs would require about six batteries. Where I'm from a 9V battery is about $3.50 each (x6 batteries) = $21 plus tax. That in addition to wires plus time and effort assembling it. This LED tester is $19 delivered to my door. It comes complete with test probes and is designed for one specific purpose only – Test LEDs. Whether it’s a single LED, a strip of six or an entire array of twenty plus LEDs, this tester will test them all. I used it to test the top and bottom half backlight arrays of a 55-inch LG HDTV I was repairing. Not only I was able to identify the defective strip from the entire array in seconds, but I also zeroed in on the actual bad LED. For individuals with even the most basic electronics background, this tool is simple to use with virtually no risk of damage to the LED since the output is adaptive and automatically adjusts to the output required of however many LEDs are tested at the same time. In contrast, a series of 9V batteries always provide full power and can easily damage LEDs. Build quality is decent but I’m not sure how long this will last on heavy-duty repair shop use. This tester is best suited for DIY, hobbyist, students or technicians training. Anyone looking for an easy and effective way of troubleshooting any LED issues including TV backlights this would be your tool. It’s actually more economical in the long run than a series of 9V batteries.
Review: Great Tool - Worked perfectly to diagnose and test TV backlight LEDs.

## Features

- √ LED LCD screen TV backlight problems are getting increasingly common. As we know, slight voltage change can have a big influence on TV function. Designed to SAFELY and ACCURATELY TROUBLESHOOT A VARIETY of LED TV BACKLIGHT PROBLEMS.
- √ Input Voltage :85V - 265V,Output Voltage :0-300V,Working Current:30mA.New upgrade excellent tool for diagnosing and locating bad LEDs in backlights.
- √ With help of this tool, you can know the LED LCD screen backlight problem quickly.High brightness and safety against electric shock.No sparking when test pen is short-circuited.Intelligent adjustment of output voltage and current against electric shock .A practical tool for checking LED TV backlight problem at any size without burning LED beads and LED panel.Save time!Save money!
- √ Testing the backlight of LED at any size display the voltage, It can be tested in a long time, and will not damage the lamp beads.Safer with dual protection of power and tester Isolation.Pocket size which is very convenient for on-door appliance.
- 【Quality Assurance】Please contact us if you have any questions during use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B082GVB68Y |
| Best Sellers Rank | #69,046 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #62 in Voltage Testers |
| Brand | TKDMR |
| Color | white |
| Customer Reviews | 4.6 4.6 out of 5 stars (739) |
| Date First Available | April 16, 2019 |
| Item Weight | 8.8 ounces |
| Item dimensions L x W x H | 3.7 x 2.1 x 1.1 inches |
| Item model number | TD2B |
| Manufacturer | TKDMR |
| Measurement Type | Voltmeter |
| Min. Operating Voltage | 85 Volts |
| Power Source | Electric |
| Product Dimensions | 3.7 x 2.1 x 1.1 inches |
| Specification Met | CE, RoHS, UL |
| Style | Digital |
| UPC | 789659036201 |

## Product Details

- **Brand:** TKDMR
- **Color:** white
- **Item Weight:** 0.25 Kilograms
- **Power Source:** Electric
- **Style:** Digital

## Images

![TKDMR LED Lamp Bead TV Backlight Tester - for All LED Lights Repair Output 0-300V (0-300V 30mA) - Image 1](https://m.media-amazon.com/images/I/71WuPJQTnPL.jpg)

## Questions & Answers

**Q: What's the difference between this and a basic digital multi meter?**
A: This is NOT a multi-meter, because this actually outputs voltage from 0 all the way until 300V but it will stop when there's resistance (meaning the LED/light bulb starts to light up, at least that's what I think is happening). But a multi-meter only detects voltage and not pass voltage to be able to light up an LED for example.

So with this device, you don't even need to power up your TV or LED that you are testing, you can just have an LED light strip for example not connected to anything, and with this device you place the RED lead on the + of led strip and BLACK lead on the - of the led strip and the led strip will light up after a few seconds, if it doesn't then the led strip is broken.

Hope that helps, I used it to fix a broken Sony TV that would not power up (because some of the LED bulbs inside went bad).

**Q: I got shocked. Did I do something wrong because it says no electric shock on it?**
A: if you touch the LED bar/bulb at same time as you testing depends on bar you might get shocked since there is current going over it . But I never got shocked if I just touch the probes themselves .

**Q: Im wondering... Would this tester work for testing car fuses as well??**
A: No, I would not think so.  This is basically a voltage and low electric current generator and monitor.  What you need is a continuity tester.

**Q: "Output Voltage :0-300V "........ ac or dc?**
A: I got this one first and it DID NOT right it, it was supposed to check the back lights onTV  and see what worked and what didn't but what it did it put way to much voltage and it would burn the back lights out, so yo end up replacing ones that were good so after that mistake I got a little more expense and it worked just fine, the good one I got was X00249NZ1H, and it worked like it was supposed to, the way it works is when you check the back lights it would send the correct voltage and light them up so you know how many you have bad, you may get lucky and only have one blub not working on the strip and that will stop them all from working, hope this helps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Right tool for the job. More economical in the long run than a series of 9V batteries.
*by S***. on August 5, 2023*

I have seen quite a few online videos and instructions on how to test LED TV backlights using 9V batteries instead of a “costly tester”. Unfortunately, testing LED TV backlights with 9V batteries is not as economical as it may seem. At 3V per LED, testing a strip of 6 LED would require at least two 9V batteries. Testing an array of twenty LEDs would require about six batteries. Where I'm from a 9V battery is about $3.50 each (x6 batteries) = $21 plus tax. That in addition to wires plus time and effort assembling it. This LED tester is $19 delivered to my door. It comes complete with test probes and is designed for one specific purpose only – Test LEDs. Whether it’s a single LED, a strip of six or an entire array of twenty plus LEDs, this tester will test them all. I used it to test the top and bottom half backlight arrays of a 55-inch LG HDTV I was repairing. Not only I was able to identify the defective strip from the entire array in seconds, but I also zeroed in on the actual bad LED. For individuals with even the most basic electronics background, this tool is simple to use with virtually no risk of damage to the LED since the output is adaptive and automatically adjusts to the output required of however many LEDs are tested at the same time. In contrast, a series of 9V batteries always provide full power and can easily damage LEDs. Build quality is decent but I’m not sure how long this will last on heavy-duty repair shop use. This tester is best suited for DIY, hobbyist, students or technicians training. Anyone looking for an easy and effective way of troubleshooting any LED issues including TV backlights this would be your tool. It’s actually more economical in the long run than a series of 9V batteries.

### ⭐⭐⭐⭐⭐ Great Tool
*by P***. on January 4, 2026*

Worked perfectly to diagnose and test TV backlight LEDs.

### ⭐⭐⭐⭐⭐ Fixed my 65" TCL and saved myself a lot of money.
*by R***P on December 12, 2025*

I used the TKDMR LED Lamp Bead TV Backlight Tester on a 65" TCL TV. The tester instructions were clear and easy to follow ( although I am a Certified YouTube TV tech. Lol! ) I found one LED on one strand that was bad amd replaced that strand for less than $5. Viola! I now have a perfectly working 65" TV in my radio shack that I use as a World Map. I definitely got my money's worth. Will I need it again? Maybe.

## Frequently Bought Together

- TKDMR LED Lamp Bead TV Backlight Tester - for All LED Lights Repair Output 0-300V (0-300V 30mA)
- Kaisiking 11 PCS Screen Suction Cup Kit LCD Screen Opening Tools Screen Replacement Tools for iPad, iMac, MacBook, Tablet, Laptop, iPhone, Samsung, Huawei, Etc.
- 6 pcs LED Backlight Strips Replacement Set for TCL TV 65HR330M08A1 65S421 65S425 65S423 JLD65081330-365AS-M_V03

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.de/products/181510562-tkdmr-led-lamp-bead-tv-backlight-tester-for-all-led](https://www.desertcart.de/products/181510562-tkdmr-led-lamp-bead-tv-backlight-tester-for-all-led)

---

*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-24*