Anth's Computer Cave

LCD Monitor Teardown

Today we are tearing down a small, battered LCD monitor to see what components we can reuse.



The victim is a 15 inch ViewSonic VA520, which plugs directly into a wall socket with no power brick required. It works, but I have no computers that can use such a low resolution. Let's see what we can salvage for other purposes.

There were four screws to remove from the back, then some gentle levering removed the rear panel.

Inside the rear of the TV with the power supply on the left.

I knew there must be a power supply of some sort in this monitor and there it was. This one looks like it could be useful.


I removed the shiny steel plate next to reveal the A/V decoder board.

The AV decoder board.

The PSU connects to this board from in the top-left of this image. The black cable attached to the right of the image is the VGA cable that connects to you PC.

I can't use many components from this board because most are too small for to work with. There is a turnpot, a couple of crystal oscillators and some capacitors. The caps are soldered hard against the board meaning their connectors will be too short to work with.


This rear power connector looks good for re-purposing in its steal bracket.

The plug fits the power supply I removed earlier.


The LCD inverter board.

This inverter board has nothing I really need. I'll keep it in case I wish to reuse the LCD panel at some stage.


The front switch panel .

The front switch panel has five buttons and a LED. Sometimes you can find a purpose for these boards with their existing layout but mostly I just desolder the buttons and LEDs


The rear support for the LCD panel.

The LCD Panel is no use to me at the moment. Its 1024*768 resolution does not suit any of my projects, but they are easy to store so I will keep it. I may need it in the future.

Its backing plate is a good solid sheet of steel.


What will I do with all this?

The base and casing I will definitely use.

The casing from the LCD.

These will become a wall-mounted light shroud. Unlike most monitors, the base on this unit swivels 90 degrees backwards, meaning you can fasten the base to a wall and use the light shroud horizontally or swivel up to shine the light vertically.

The casing from the LCD folded 90 degrees.

You can expect to see a light shroud project on the Cave very soon.



The power supply from the LCD.

The power supply from this teardown may be suitable for the light shroud project, but I have other plans for it.

It has one 12V rail and two 5V rails. According to the specs from ViewSonic it is rated at 30W. It is compact and light, and it is matched to the rear power connector I salvaged from the monitor.

One of my current builds is the base station for a home automation system for The AAIMI Project. This base station just happens to require a compact power supply with 5V and 12V.

I'd call that a happy coincidence.

The verdict

I'm calling this teardown worthwhile. I get to use nearly all of the components and there is no real waste.

Note, however, that this monitor plugged directly into the wall for power. The typical monitors from this period had a power brick instead, and you would find less usable components inside those units.

Stay tuned for upcoming projects using these parts. For now, feel free to explore the Cave.

Cheers

Anth


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Next: Teardown: HP 1400 printer


Comments

Leave a comment.

Rick 5/10/2018: 4.00PM

I was looking for some projects to work on after finding a LCD discarded.

Coming across your site was refreshing as others seem to just take a wierd sanctimonious air about them.

Thank you.

Anth 5/10/2018: 4:05PM

Hi Rick

I'm still using the power supply out of that LCD for my home-automation system, so they're worth having a look at.

I reckon the reason the electronics people treat us with a sanctimonious air is because it's:

A:

Easier than explaining the info to us noobs.

Or B:

They don't want us destroying ourselves or our equipment. I can relate to this because as an ex-carpenter I wouldn't try to explain how to safely build a deck or any other critical structure in just a few lines.

That's why I try to learn on worthless broken ectronics so I can learn without destroying valuable things,and without getting talked-down-to by those others you mentioned.

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