SONY KDL-40NX700 2 red led blink problem

[ozguven]

When the power is turned on, a snapshot appears on the screen and it turns off. 2 red LEDs are flashing.

I disconnected the power module cable going to the main board. I threw a power on jumper with 3.3 v from outside. The relay is working and there is 12v and other voltages in the power socket.

Where else should I look? All fuses appear to be intact.

[Davi.p]

Check the service manual for that 2 blinks, i suspect backlight..

[ozguven]

Hello,

This is what is stated in the manual.
TWO Blinks---B+ over current protection (OCP) , unit goes to the standby
mode then displays the 2 blink fault. Could be a short in the power supply of
any of the circuits.

When turned on, the backlight turns on momentarily. Then everything shuts down. I tried to measure it with a voltmeter until it shut down. Something like 85v. The voltmeter cannot read quickly until the relay closes.

[Davi.p]

Try to disconnect the tcon and see if blinks becomes 5

[ozguven]

yes, I didn't say Tcon Power. Then it blinking 5 times.

[ozguven]

I also suspect the rear lush led bars. I want to be sure of dismantling everything.

[ozguven]

I wrote it incorrectly. I also suspect the back light led bars. I want to be sure of dismantling everything.

[vinceroger69]

If i remember these sets have edgelit leds these are older sets now i think 2010 era so my guess is bad leds

[ozguven]

Yes. The device manufactured in 2010.

[nomoresonys]

It's a 40 inch screen, you shouldn't have a problem taking it apart if you go slow and take your time, just treat the panel like a baby.

[Davi.p]

Don't run.. dismantling panel is always risky, test the tcon at bench with bench psu, check the various converters, or at least if psu goes protect mode..

[ozguven]

Now I removed the panel. I tested the LED bars. LEDs on one side did not light up. There are 4 bars in total. Grouped in pairs of 2. I tested the double group of bars I tested one by one. 2 LEDs in one of the bars are faulty. I wonder if this is the source of the problem.

[vinceroger69]

Now I removed the panel. I tested the LED bars. LEDs on one side did not light up. There are 4 bars in total. Grouped in pairs of 2. I tested the double group of bars I tested one by one. 2 LEDs in one of the bars are faulty. I wonder if this is the source of the problem.

yes once you replace the strips the tv should work fine again (i have just repaired a tv just one led had failed and caused no backlight at all)

[ozguven]

OK. Thanks.
I will change it as soon as possible and share the result.

[ozguven]

LED bars arrived today. I made the change and tested it. It works perfectly. Thanks to everyone who helped.

[vinceroger69]

Thats good to hear and another tv saved from landfill.