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My Sony Bravia TV (model KD-49XD8005) wont turn on after incident

Hi IFixit community


I have a 2.5 year old Sony Bravia 49 inch LED TV (KD-49XD8005) which wont turn on any longer. It happened after an incident when I was plugging an HDMI cable from my TV to my desktop computer. The TV was plugged in, and turned on. Without thinking about it, I tried to connect to my desktop and a few sparks jumped from my graphics cards HDMI port to the end of the HDMI from the TV as I plugged it in. Afterwards, the back-light was turned on, with no image and the status light was gone. So I used the remote to turn off the TV, and afterwards the TV will not turn on again. Right now, the TV shows no sign of any power (no indicator light, flicker, anything)


I have tried the following for troubleshooting:

- Unplugging all other devices/wires except for the power supply and try turning on

- Letting the AC power supply and TV “rest” separately for a week before trying to plug it in again and turning on

- Trying both only the power on button on the TV and/or only the remote

- Checking the AC power supply, which does supply the correct 19.5 volts, checking with my volt meter.

- Opening up the television, trying to check if any capacitors were bulged or if anything that looked like a fuse was blown using my volt meter, with no luck/anything seeming broken


My question is if anyone has experience with anything similar to my case or advice on how I could troubleshoot further? I was planning on sending it to a technician, although the ones in my area have horrible reviews (even the ones Sony is directing me to)

If anyone is interested in pictures of the boards, I will gladly supply them.


Thanks in advance


[EDIT #1]

Pictures of boards and first measurements

Overview: (Yes there is a shield on the “bottom” board. Please write if anyone wants me to remove it and show the board. I imagine its related to the LED backlight

Block Image

Board which receives DC power:

Block Image

Data board with output/input:

Block Image

Power brick:

Block Image

Power brick measurement:

Block Image


[EDIT #2]

Measured the pins going to the main board and these values:

Block Image




Update (08/29/2019)

I have just repaired the TV - it was the main board which was the issue.

I replaced the board and booted using the correct firmware on a NTFS USB drive.

Answer this question I have this problem too

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1 Answer

@dumbldoor sounds like an issue with the main board. Yes, pictures will definitely help. Post those with your question Adding images to an existing question

With the back removed check the power going to the power board. Measure carefully to see if your set gets power and let us know what you find. That way we know where to start further troubleshooting. Remember (very simplified) it is the main board that ells the power board to turn on. So any trouble with the main board could be disabling your TV.

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Hi oldturkey03

Thanks for the explicit guide on image upload - very helpful. :-)

I have uploaded images of the two boards which are visible when opening the case. The bottom board is still shielded, but if you want an image of that as well, please feel to comment and I will upload that as well.

I measured both the DC power brick directly (see image) as well as the terminals (on the dc jack) on the board, also getting around 19.5 volts. So the board seems to get power at the terminal. Do have any recommendations on what points/terminals I should measure from here? I will then report those back.

Thanks in advance

by

Hi @oldturkey03

I just read another post you answered which reminded me of this situation: Sony tv KDL-50W800B not turning on

I have measured the fuses and they have continuity. I have also checked the voltages on the CN4001 connector. I am getting 3.3V, although on pin 7. Furthermore I am getting 12V on two pins and 19.5V on two other pins. Please see the "edit 2" image, with the pins marked.

Do you know if those pins should behave like that? If so, do you think the Main board might be the culprit?

Thanks in advance

by

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Mathias J will be eternally grateful.
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