Samsung Syncmaster 2443 Backlight Inverter Replacement Repair Guide

Difficulty

Easy

Steps

Time Required

                          1 - 2 hours

Sections

Backlight Inverter
3 steps

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Introduction

In this case, a few windings of the transformer have an short circuit, causing the resistance of the two secondary coils to be different.

The fault of transformer can be detected by measuring the temperature of the transformer left and right side using infrared thermometer or thermal imager. The temperature will differ greatly.

Power supply model number is BN44-00238

What you need

Step 1

              Open the display

Remove the power cord.
Remove the display stand by removing the two screws on the round plate on the backside of the monitor
Open up the backside of the display (display placed face down on cloth to avoid scratches) by carefully releasing the snapped in latches using a screwdriver or opener tool.

Remove the power cord.

Remove the display stand by removing the two screws on the round plate on the backside of the monitor

Open up the backside of the display (display placed face down on cloth to avoid scratches) by carefully releasing the snapped in latches using a screwdriver or opener tool.

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Step 2

              Remove metal cage containing PCBs

The metal cage housing the PCBs as just stuck to the backside of the LCD.
Carefully remove adhesive strips, release the cables to LCD and front panel buttons.
Remove SMPS PCB (switching mode power supply) by removing screws around.

The metal cage housing the PCBs as just stuck to the backside of the LCD.

Carefully remove adhesive strips, release the cables to LCD and front panel buttons.

Remove SMPS PCB (switching mode power supply) by removing screws around.

Step 3

Caution: Touching the capacitor wires may cause serious injury. Use a capacitor discharge probe to safely rid the capacitors of dangerous charges.
From power board desolder transformer. It has 6 pins on one and 4 pins on the other side.
Replace with new transformer. (Model TM-09176)

Caution: Touching the capacitor wires may cause serious injury. Use a capacitor discharge probe to safely rid the capacitors of dangerous charges.

From power board desolder transformer. It has 6 pins on one and 4 pins on the other side.

Replace with new transformer. (Model TM-09176)

To reassemble your device, follow these instructions in reverse order.

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                    Thomas Widmaier

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Walter Holzwarth - Jun 23, 2016

Caution!

Myrra 12 V AC Transfor 5VA is not compatible with TM09176

Kristijan Žganec - Jan 17, 2019

Hi, I have the same issue with the same monitor. But in my case, the transformer has equal temperature on both sides. Is there any way for me to check if it’s really the transformer or something else?

One more thing, there is a high-pitched noise coming from the upper part of the screen (probably the backlight), after the screen goes dark again. Thanks!

Thomas Widmaier - Jan 17, 2019

High pitched noise is probably the resonance of a coil either the transformer or another inductor of the swtiching regulator circuit.

You could try and measure the inductance / resistance of the transformer (desolder first) and check if they match very closely.

Dumbo - Jul 4, 2019

I took some thermal images (using SeekTermal camera) from the power-supply board of this TV:

The rectangular black transformer TM-09176 (T301) gets 60°C at one side only. But the resistor R301 beside the transformer, gets nearly 100°C! This is maybe due to unregulated high current coming from the transformer? The rest of the board stays very cool.

Thomas Widmaier - Jul 4, 2019

Measure if there is any short circuit to ground with resistance or continuity mode around the resistor that gets hot.

Maby the CCFL Tube or wire is shorted ?

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