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Old 07-12-2016, 03:11 PM   #1
tech2014
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Default Sony KDL-46EX400 startup issue

I have a Sony KDL-46EX400 that is acting strange. When you power it up, the backlight will come on for a second, along with a loud buzzing sound. It tries to turn on 3 times, then goes into standby. The LED flashes 6 times.In the service manual it indicates a backlight problem, and the possible cause it says LCD panel.

When I remove the connections going from the power supply to the inverter board, the tv doesn't buzz anymore when trying to power up. It just tries turning on and chirps each time(rather then buzz), then goes into standby. Would this be a bad panel or inverter board? See pics below.

TV1.jpg

TV2.jpg

TV3.jpg
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Old 07-12-2016, 03:28 PM   #2
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Default Re: Sony KDL-46EX400 startup issue

Bad panel how ? Also checked the secondary resistance of the little buffer transformers and the main one on the Psu for the backlights ?
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Old 07-12-2016, 03:31 PM   #3
tech2014
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Default Re: Sony KDL-46EX400 startup issue

It says possible cause for 6 led flashes is LCD panel in the service manual. I forgot to mention that there was a lightening strike and it took out a few of this guys appliances and other electronics.

I will check the transformers and let you know what I find.

Last edited by tech2014; 07-12-2016 at 03:32 PM..
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Old 07-12-2016, 03:31 PM   #4
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Default Re: Sony KDL-46EX400 startup issue

Please read the Training manual.
6X Blink - Backlight System Failure (46” Models)
The 46” models have both a 4X and 6X blink protection mode. The 4X blink will, in most cases, be caused by a defective lamp.
Because all the Backlight HV Inverter circuits are located on the GD2-Board, a 6X blink protection mode will be fixed, in most cases, by replacing the GD2-Board. If the GD2-Board does not repair the problem replace the A-Board. The BL-ON and Dimmer signals come from the microprocessor on the A-Board. A shorted or open BL-ON signal will cause this 3X condition. Also a shorted Dimmer will cause this 3X condition.
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

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http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Old 07-12-2016, 03:35 PM   #5
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Default Re: Sony KDL-46EX400 startup issue

thanks budm.
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