Question about LG 50LS4000

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When turning TV on, why does the screen blink on and off?

I changed Tcon board but same problem

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Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Posted on Apr 30, 2015

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Posted on Jan 02, 2017

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Have a samsung TV UN40H5203AFXZA will not turn on. When plugged in the stand-by light blinks seven times and goes off. Changed power,main and Tcon boards. 3 lights come on the Tcon board but go off.


Please un-plug the cable between the main board & the power supply, apply the AC power to it, if the back lights come on & still on, replace the main board; if the back lights did not come on, mostly the problem is defective back light LED strips.

May 08, 2017 | Samsung Televison & Video

1 Answer

Sony Screen wont turn on. Replaces tcon. No Power going to tcon.


Hi Nick, Please trace the 12V line. Most probably it is coming from the main board.

Dec 10, 2016 | Sony Televison & Video

1 Answer

Sony Bravia KDL-60EX500 no longer turns on.


Refer to Sony KDL 55EX500 Troubleshooting Manual Protection Mode Symptom...
5X Blink - TCON & HFR Failure
The 5X blink protection mode indicates a communications error between the TCON/HFR board and the MT5388 microprocessor on the A-Board.
First replace the TCON/HFR Board if the 5X protection mode blink pattern occurs. If the TCON/HFR Board does not repair the problem then replace the A-Board.

see schematics in Sony KDL 55EX500 Troubleshooting Manual Page 23

Sep 15, 2016 | Sony Bravia Kdl-60ex500 60" Inch 120hz...

1 Answer

Tv turns on but is white screen


The TCON board or the LCD panel is faulty. Can confirm by replacing the TCON board. If you wish to get some details about repairing LCD LED TV then check the link below
http://electro-medical.blogspot.com/

Jul 03, 2016 | Televison & Video

1 Answer

My LG TV lcd sound okay and the back light is on but no display on the screen


check your data flex between the main board & the screen Tcon if good change your tcon or the entire screen because the tcon connection to the screen is lost due to dry joints

Jul 14, 2015 | LG Televison & Video

1 Answer

I have a Vizio XVT3d474sv. My TCON went bad, only one side of the screen was working. I ordered a new TCON for it. I had been checking over other things and was lightly tapping areas to see if somethi


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Nov 03, 2014 | Vizio XVT3D474SV 47 in. 3D LCD TV

1 Answer

Tv white screen


Problem is with Tcon board mounted on the LCD panel. Either replace Tcon board in complete or try to replace IC AS15-HGXXXXX mounted on Tcon board.

Oct 05, 2013 | Sony KLV32S400A 32 in. LCD TV

1 Answer

My sony bravia kdl-32s3000 keeps turning off and the standby light is flashing 5 times


Just a copy from Sony:
5X Blink - TCON & HFR Failure
The 5X blink protection mode indicates a communications error between the TCON/HFR board and the MT5388 microprocessor on the A-Board. First replace the TCON/HFR Board if the 5X protection mode blink pattern occurs. If the TCON/HFR Board does not repair the problem then replace the A-Board.

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Oct 24, 2012 | Sony KDL-32S3000 32 in. LCD Television

2 Answers

My tv sony bravia 46" are still not workin i still


Don't return the new refurbish tv power supply board,keep it and used it the old one u have it in ur tv it is shorted and dead already.Return those LCD inverter boards though.Should buy a main tv Tuner signal board and replace it too though,that the other board it is causes and it is also dead too.Repair this problems many times before,alway these two boards are dead.I promise u the tv now will have stable power supply again tv will work again.

Jul 15, 2011 | Sony BRAVIA KDL-46W4100 46 in. LCD HDTV

1 Answer

The TV won't turn on, and the standby light is blinking in groups of 5. The manual mentions this, but only that the number of blinks is significant, not in which way. What do we do?


Just a copy from Sony:
5X Blink - TCON & HFR Failure
The 5X blink protection mode indicates a communications error between the TCON/HFR board and the MT5388 microprocessor on the A-Board. First replace the TCON/HFR Board if the 5X protection mode blink pattern occurs. If the TCON/HFR Board does not repair the problem then replace the A-Board.

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Jun 14, 2010 | Sony KDL46EX500 46 in. HD-Ready TV

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