LCD TV Backlight Repair From CCFL to LED
https://www.instructables.com/id/LED-Backlight-for-Your-LCD-Monitor-or-Television/
Until recently after reading that article, I tried to repair the TV. Able to isolate the Inverter and removed the CCFL to test, and lo and behold, the other side of 4 CCFL inverter is defective. The mosfets are shorted. I tried to use only the other side by cutting traces and isolate the shorted parts, but still the TV auto shutdown. Putting a flashlight into the screen will show that it is working. My option is to buy universal inverter since both CCFL still working, but I like better the LED strip option since this is cheaper and safer. I created relay switch so that the LED strip is off when TV is off also. I know this is not the best option, but for this, works perfectly and served my purpose. This is also very cheap and quick repair. I spent around $4 only on this.
Parts :
LED White Strips - 2 ( 10 inches each )
LED Red - 1 ( For relay indicator )
12V Relay - 1 ( Normally open from an old TV board )
BC547 (NPN) - 1 ( For relay switch )
Diode (Rectifier) - 1 ( For relay protection )
Resistor 10K - 1
Resistor 1 K - 2
Assorted Wires - For connection
Breadboard - 1 ( For the relay switch circuit )
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Warning : Please always work safely and respect any power source even if it is low voltage. This project will require working with TV power supply and high voltage Inverter. I am not responsible for any harm or damage to anything it may cause to anyone that will try this instructables. Remember to remove power and allow time to deplete the power before working on the board.
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Step 1: Remove CCFL From LCD Screen
Step 2: Determine the Required Length of LED Strip
Measure the total length of the CCFL and match the LED strip, this strip can cut for every 3 LED. I bought mine from local electronics shop. They sell per 3 LED's.
Step 3: Connect Wire to LED Strip
Solder the wire on each LED strip, I did this by scratching the self adhesive tape at the back of the strip copper pad. Take note of the polarity and color of the wire to use to ensure that correct potential is provided on each pad.
Step 4: Build the Relay Switch Circuit
Step 5: Identify Relay Circuit Trigger Pin to Activate When TV Is On
From the inverter connection, locate the pin where it is "Zero" when the TV is off and with any voltage when the TV is on. In this TV I located the one with brown wire. This is using voltmeter and found to be around 3 volts. This is enough to drive the NPN transistor and eventually energize the relay.
Step 6: Connect the Relay Circuit to the Logic Board
Connect the relay switch Vin to the 3 volts pin, the power of 12V and to ground. Switch on the TV and see if the relay will activate. I removed the connector from the defective inverter and soldered to the relay board.
Step 7: Re-assemle the LCD Panel With New LED Strip
Step 8: Finally - Connect the New Relay Circuit and LED Strip Together and Enjoy
source: https://www.instructables.com/id/LCD-TV-Backlight-Repair-from-CCFL-to-LED/
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