Facing TV Problems? Ask a TV Technician.
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Do you have a multimeter available to take some test readings?
Ok, can you test the voltage outputs from the power supply board and let me know what they are?
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Hello, I'm Shahid. Sorry to hear that you're having trouble with this but I'll do my best to help.
Can you check standby 3.3V DC output on power supply board connector that goes to main board of TV?
3.3V would be stamped near the connector.
This is odd reading, set your voltmeter to DC Volt range and measure DC 3.3V at pin-3 at connector CN6200 of power supply board, these volts should be constant.
If volts is available and no standby/ power light solid or blink on TV front then replace the main board of TV which isn't working and causing the problem. I hope these info will help. If you have any additional questions, feel free to ask.
Its OK, unplug CN6402 and check 3.3V DC which would be available all the time when plug TV power cord in.
Is the 3.3V stable/ constant?
If so, replug CN6402 and again check 3.3V that should stay stable/ constant.
If volt goes low/ high that means main board is bad and should be replaced.
I'm afraid I have no idea about market in Nigeria and you would need to contact Sony service center in Nigeria to get replacement main board, if required.
Do you need any further assistance with this question?