Old TV as work light

[VK3ZYZ]

I was inspired by DIY Perks Youtube channel to have a play wih an old TV backlight.

Much to the "delight" of my XYL, another old TV was picked up from being dumped on the side of the road. This one is a 44" JVC model. Upon trying it out, the LCD was reveled to be smashed. In fact, it looks like some goo from the LCD has leaked over a lot of the back light lens so it is a bit damaged.
Once the LCD was removed, the back light could be turned on with the TV power switch but after a time, it would power down again. So, the next step was to see if the TV board could be removed and just leave the power supply there.
After measuring the power supply pins with the TV in standby and then powered up, the pins on the TV board of interest are as follows....
Standby ON
12V 12V 12V
ON/OFF 0V 3V
ADJ 0V 2V5

So, I tried a 470R (it looks like in the picture. I ment to use a 1K2 but must have picked up the wrong one) resistor from 12V to ON/OFF, 1N4148 from ON/OFF to ADJ and a red LED from ADJ to GND.
And it looks to be working

The parts fit on the bottom of the power board connector...




I just thought of something else. As the TV screen and board are no longer there, the 12V would be available for other uses. Hmmm.....

 

[VK3ZYZ]

And as a bonus, there was a WiFi/Bluetooth module in the TV.
as well as a couple of nice compact speakers.

 

[VK3YNV]

Nice bit of salvage, could you lay it flat as a benchtop light box?

 

[VK3ZYZ]

Another version.

 

[VK3ZYZ]

Well, I did it again!
There was this lonely rejected 60" Bauhn TV on the side of the road.
As normal, the screen was smashed. But after removing the LCD, this is what remains.

The back light works fine. I had to wind the camera exposure down as far as it would go to get this shot.

This is what it looks like at that exposure setting and no back light.


I'm thinking this TV, mounted in a nice wood frame, will make a great work light over our kitchen bench.

 

[VK3ZYZ]

The TV needs the power button pressed to turn the backlight on, so here is my "Power On Reset" circuitry.

It plugs into the main board in place of the push buttons, and gets the 3.3V from the IR sensor lead.

The rest of the leads are just cut off leaving a bit of wire for Justin Case.
The back light starts about 3 seconds after power is applied.

The 3D printer is useful to make a drilling guide for the wooed frame.

 

[VK3ZYZ]

I made up the frame this morning.

and was intending to use magnets to hold the TV in the frame.


Here it is on the TV.


But the magnets did not prove to be strong enough to reliable hold the TV whilst adding the main holding brackets.
So, I will go with safety chains attached to the 4 TV mount posts.


That will have the TV swinging in position and then I can lift it up and secure it.

 

[VK3YNV]

Hi Denys,

If you want to rip some pine or kd strips to run around the inside of the frame, I can do them on the table saw.

I had to clean up the outfeed table yesterday to finish a riser stand for the tumble dryer.

 

[VK3ZYZ]

Today I mounted the frame on the ceiling after climbing into the ceiling space and measuring where the bearers were and running the power cable.
The crawling over and under the air conditioning ducts was quite a chore!

The plaster lifter is real handy!

And it does not look real bad

Wiring up tomorrow!

The power will come via the white 3 pin socket in the rear right corner.

 

[VK3ZYZ]

The terminals and wires in the old lamp were crumbling from the UV. But now, with new terminals (and tightening up one that fell off), the connection went well and the light looks good!

 

[VK3YNV]

looks great !!

 

[BillC]

looks great !!

Looks good,