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joan78
Joined: 06 Sep 2013
Posts: 4
Location: Dominican Republic
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 Posted: Fri Sep 06, 2013 1:10 pm Post subject: Sony Bravia KDL-55EX720 LCD 4 red led light blink code |
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| We have a Sony KDL-55EX720. When the TV is turned on, it display the screen for few seconds and them it automatically Turn Off and give a signal of 4 red light blinks. This is suppose to be a backlight inverter failure. We requested Sony Part 147430211 (DPS-78 CH 1-883-933-11) G8 Converter/inverter and replaced. But the TV Still give the same message. What can you recommend us to do? |
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curtis wolfe
Joined: 11 Apr 2013
Posts: 27
Location: connecticut
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| Posted: Sat Sep 07, 2013 8:33 am Post subject: |
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| The manual said as a last resort the g6a board could be bad but the manual has no schematics showing the boards. This is all I could find. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away
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| Posted: Sat Sep 07, 2013 9:32 am Post subject: |
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| Panel could have one (or more) defective bulbs. |
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joan78
Joined: 06 Sep 2013
Posts: 4
Location: Dominican Republic
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| Posted: Mon Sep 09, 2013 7:32 am Post subject: |
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We got the service manual for this TV, It's first indication is to check the voltage on the BATV Board (the one with all the input connection), if it's good, them the next step is to replace the G board, the bad is that this TV has 2 G boards, the G6 and G8 Board. Already replaced the G8, which cost us around 90.00 USD, the G6 has a price of 190.00 USD. I just wouldn't like to order the second board to find out it's not the problem.
If it not the G Boards, the manual suggest to replace the LED Driver Board, which i think is the one on the middle of the TV, just above the T-com board.
About the panel, if it turns on, at least for few seconds (once got it to turn for half an hour), and looks OK, Is it probable it has bad bulbs?
Is there any way to test the G6 board?
We got the service manual from this link:
http://elektrotanya.com/sony_kdl-32_37_40_46_kdl-55ex720_ex721_ex723_ex724_ex725_ex726_ex727_ex728_ex729_chassis_az2f.pdf/download.html |
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JTS1957
Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away
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| Posted: Mon Sep 09, 2013 1:30 pm Post subject: |
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Inverter is a balanced circuit. If there is any intermittent, due to a broken bulb, blackened-end bulb, bad connection at any bulb termination etc. the circuitry will sense these and shut it down.
Does the audio continue or gets shut off too? |
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joan78
Joined: 06 Sep 2013
Posts: 4
Location: Dominican Republic
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| Posted: Mon Sep 09, 2013 2:47 pm Post subject: |
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| The hole TV Gets shut off and red light start blinking, 4 times and a pause. The TV won't turn on again unless power cord is unplugged and plugged back. |
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tvrepairtech
Joined: 04 Oct 2013
Posts: 2
Location: tulsa
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| Posted: Fri Oct 04, 2013 8:36 am Post subject: Re: Sony Bravia KDL-55EX720 LCD 4 red led light blink code |
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HI! IT could the power supply failure as well. What is the power supply board
board part number? |
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joan78
Joined: 06 Sep 2013
Posts: 4
Location: Dominican Republic
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| Posted: Fri May 18, 2018 5:07 pm Post subject: |
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| I know its a old thread, but wanted to share our solution. The TV was fixed by replacing the led Strips on the LCD Panel. Had to pull them out to see the part number on them , and found them for 45 Dollars from a provider from china on Ebay (60LED LED strip S1G2-550SM0-R1 for KDL-55HX750 LJ64-02875A LJ64-02876A). TV is working for now, but unfortunately the damm vertical black line still there. |
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