Hi,
I noticed a TV out on the street that had been thrown out. It was near my house, so I thought why not take it and have a look to see what is wrong with it. I'm not expecting to fix it, but I am curious enough to try and see if it's perhaps something simple (i.e. a simple board replacement). You can sometimes be lucky like that.
Here's what happens:
Plug power cord into outlet. A very faint sound can be heard coming from one of the components on the power supply board. Power LED is red which likely indicates standby.
Press power button and light turns blue (probably indicating ON status). After this, that same component makes a more noticeable constant noise. I can't really describe it, it's like buzzing or chirping, just a constant sound that doesn't stop until power is cut. It's not deafening loud, but it is noticeable if you go closer to the component. Screen is pitch black. No backlight or anything like that can be seen upon power up.
If the board is just plugged into the mains, it makes no sound at all. As soon as the main board gets plugged in, it makes a faint sound on standby mode and gets louder if I press the power button.
The component that's producing the constant sound is marked on the screenshot. What is it? And what would cause it to make a constant noise? Does it explain why the screen is black?
How likely is it to be a power supply board fault? I've seen some spare boards on sale that I'm considering if it is the power supply board. I guess I just want to have more information before I decide to purchase a spare board.
I'm no expert on board repairs at the component-level, so actually fixing what's wrong on the board is out of my league at this time. If there's anything I can check with a multi-meter to verify if it's the power supply board, I am willing to do that.
Appreciate any input.
I noticed a TV out on the street that had been thrown out. It was near my house, so I thought why not take it and have a look to see what is wrong with it. I'm not expecting to fix it, but I am curious enough to try and see if it's perhaps something simple (i.e. a simple board replacement). You can sometimes be lucky like that.
Here's what happens:
Plug power cord into outlet. A very faint sound can be heard coming from one of the components on the power supply board. Power LED is red which likely indicates standby.
Press power button and light turns blue (probably indicating ON status). After this, that same component makes a more noticeable constant noise. I can't really describe it, it's like buzzing or chirping, just a constant sound that doesn't stop until power is cut. It's not deafening loud, but it is noticeable if you go closer to the component. Screen is pitch black. No backlight or anything like that can be seen upon power up.
If the board is just plugged into the mains, it makes no sound at all. As soon as the main board gets plugged in, it makes a faint sound on standby mode and gets louder if I press the power button.
The component that's producing the constant sound is marked on the screenshot. What is it? And what would cause it to make a constant noise? Does it explain why the screen is black?
How likely is it to be a power supply board fault? I've seen some spare boards on sale that I'm considering if it is the power supply board. I guess I just want to have more information before I decide to purchase a spare board.
I'm no expert on board repairs at the component-level, so actually fixing what's wrong on the board is out of my league at this time. If there's anything I can check with a multi-meter to verify if it's the power supply board, I am willing to do that.
Appreciate any input.
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