YEKMLCO KT4H 0-330V probador de retroiluminación de TV LED ajuste inteligente ajuste Manual de voltaje placa controladora de corriente constante reparación cuenta LED

Product Parameters

• Product model: KT4H
• Vin: AC 85-265V
• Vout: DC 0-330V (Automatic + Adjustable)
• Voltmeter Accuracy: < (± 0.5 ± 1%Vout) V
• Iout: 0-150mA (Automatic + Adjustable)
• Constant Current Board Testing Current: 0-999mA
• Ammeter Accuracy: <(±2 ±1%Iout) mA
• Pinput: 50VA (MAX)
• Temperature: -20℃~+40℃

Product Introduction

Real-time testing voltage and current of constant current drive board.
1. Testing LED strips, LED panels, single LED bead, COB lighting sources and so on.
2. Testing backlight of LED TV, displays, computers and so on.
3. Compatible with all the LED strips (high voltage or low voltage).
4. Manual adjusting the range of testing voltage (20-330V/DC) and current (20-150mA).
Adjusting voltage at open circuit (without loads) and adjusting current with loads or contact probes together.
5. No burn out when testing single LED bead with wrong polarity. (Set voltage around to 20V and the current switch to 1mA)
6. Testing voltage parameter of various of electronic components.
7. Testing LED light on vehicle.

Test Method without Disassembling the Screen

Cut off the power of TV, Unplug the interface sockets of the constant current plate and light bar, Insert the Red and Black pens of the tester into the anode and cathode of the interface of the LED light bar.
1. Multiple LED strips
Testing the voltage of each strips and record them. Compare the voltage of each strips, it is normal if the differences <2V or <3%.
2. Single LED strip
A. The LED strip is not on (need remove the screen to repair):
voltage = 0, SHORT CIRCUIT. Voltage ≥ 300V, OPEN CIRCUIT.
B. The LED strip is on (need the testing references of constant current driver board to determine the backlight is normal or not).

Please note here that the voltage is adjusted when the circuit is open and the current is adjusted during the short circuit.

Introductions of the Additional Function

Voltage Test of Electrolytic capacitor:
Connect the black pen with the cathode of the electrolytic capacitor and the red pen with the anode. The voltage value displayed in the voltmeter will rise fast at the beginning. When reaching a certain point, the rising velocity will slow noticeably. At this time the voltage value displayed is the actual withstand voltage of the tested electrolytic capacitor. (The capacitors are qualified if the actual voltage value is higher than the indicated voltage value )
Notice: Avoid to break the capacitor, the testing time should not be too long.
1. Set the voltage around 20V and the current to 1mA when testing the voltage references of diodes, triodes, MOS tube and IC.
2. Set the voltage around 330V and the current to 1mA when testing the breakdown voltage of capacitors, stabilivolts, piezoresistors and TVS.