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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.

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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.

Posted on May 27, 2017

  • Ronald Albright May 27, 2017

    TV has never had any back lighting. After being plugged in for 10 minutes the stand-by light comes on. Once you push the button it starts blinking. I guess its trashed?



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Posted on Jan 02, 2017


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Hi there, my Samsung TV turns on, but the screen is black and the audio works. I changed the main board and power supply/LED board. I'm thinking the T-con board but I just wanted your opinion.

You have already changed power supply/led board and main board. What is left now is the tcon and scaler board. Please try tcon.This may solve your problem. By the way, there is a systematic way of singling out the faulty board. A little research on this will save you save you time and money. Good luck.

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My Samsung 40” led wont turn on and little light blinks 5 times. I have changed the power board and the main board!! What’s next???? T CON board???

Tcon won't cause this issue, check the voltages from the power board with it on and see if they are all right, sounds like you may have got a bad replacement board

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Hi have Samsung tv(UN40H5203AFXZA) Version:TD01. It doesn't turn on just red light blinking, no sound/ pics.How can I know if it's main board or power supply board and what should I buy? Thank you

Hello Anas,
These failure could be a combination of the power supply and the main board failing.
I would suggest to replace both boards or if you are able to measure the voltages from the power supply and verify that the power supply is working, then you should only replace the main board.
Let me know if you require further assistance.
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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.

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How do I fix a Samsung UN40H5203AFXZA LED that TV flashes when I plug it in.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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Sony trinitron kd-34xs955 standby light is blinking 7 times

Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
As you can see here, seven blinks of standby light is due to some over voltate at the final anode of the picture tube. This is a protection process that going on insde the tV circuits, to prevent more damage to other comnponents on board. The most common cause for this is with the main power regulator out voltage itself. If any way, it ahs exceeded 135VDC, this kind of fault will occur. Check the main power regulator section circuit for any damaged component/s. Replace all the small electrolytic capacitors there. Visit the site named 'Electro-help' for more details. Check this LINK and select the site named above. View it in 'Flip card' option, which can be selected from the drop down box menu at the left top corner or the display window. It will make search easy. Some times, the ads attached with each posts might help you to find the availability of spare parts. There are more than 550 posts to different brand TVs. Blinking codes and details are there.

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My sony tv automatically goes into stand by mode and we have already changed the power supply as solution given by fixya .com

If the unit is playing normally then goes to stand-by, it could be also caused by the main board and or the ballast boards. If it is caused by the ballast boards, it should give you error code with the red stand-by light blinking 11 or 13 times. If the stand-by light does not blink a code, it is probly the main board.
I hope this helps,

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Red LED light blinks 7 times when the set is turned on; no pictur

if you have the circuit diagram of your tv,check the horizontal polarisation IC closer to the line transformer and replace it.If it doesn't work,send the question again.

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The most likely problem are two failed capacitors on the main board in the center of the TV The failed parts are easy to identify as the top of the cap will no longer be flat but will have bulged up. DO NOT attempt to remove the back of the TV unless you know what you are doing.
soldering on a circuit board will be required to fix this problem.

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Stand by light blinks 6 times, wont power on

Here you find sony blinking codes

SIX Blinks---No Horizontal (H STOP), no raster, goes to the blinking selfdiagnosis
function immediately. Check C515 & 516 and the jungle IC, IC206.

SEVEN Blinks---High voltage shutdown. The high voltage has exceeded 33k
and the unit goes immediately into safety shutdown. Check power supply
regulation and horizontal circuits.

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