st-90a standalone tft lcd monitor price

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Late 90s / early 2000s TFT LCD monitors… They weren’t great, but hey, they set the scene for everything that was to come, including the monitors that we still use today. I bought a bargain eBay job lot of them - but do any of them actually work? Can I repair any that don’t?

…that’s right! A 12.1” LCD DigiPOS-branded screen - which of course goes with the Point Of Sale PC which I’ve been turning into a DOS gaming machine - and I’ve been on eBay looking for small CRT monitors specifically for that machine and the company that actually sold that to me initially - which was the clothing retailer in Coventry which are closing down - happened to have just listed a job lot of six of these matching monitors.

So we have six DigiPOS branded 12.1” TFT LCD monitors, and of course these will be quite early TFTs so they’re probably not brilliant for gaming and stuff but they are LCDs so, you know, none of that dual scan rubbish as far as I can see.

These monitors cost me the grand total of £38 - so yeah, £30 for the six monitors and £8 for postage - and judging by the size and the weight of that box, I think the postage probably ended up costing them quite a lot more than that.

But to be fair for the price I can’t really grumble and they will just be something fairly bog standard so I don’t think that’s a huge problem - and a big bag of VGA cables too! These just have a VGA on the back of course. A small, portable, VGA LCD monitor is always a handy thing to have around for testing and quickly getting stuff set up and whatever else.

We’re actually off to a good start with monitor number 1. The plastic is a little bit yellowed and the screen perhaps looks a bit dim, but that could just be dirt. Otherwise it seems to be working fine, so I’ll set this one aside.

Up next is monitor number 2, and this is one of those ones with the black frame around the screen, which I’ll take a closer look at later when I get it apart. I can see things happening on the screen so the LCD part seems to be working, but I think it’s safe to say that the backlight’s dead in this one.

On to number 3, and after some initial glitching, this monitor actually seems to work OK. Maybe just a loose connection and hopefully I can give the insides a poke and it’ll be as good as new. Maybe.

Number 4 now, and this is the first one I got out of the box with that big scratch on the front. That horizontal band across the screen looks terminal, but again this one has a working backlight which perhaps I can salvage, and maybe swap into that second monitor I tested.

Monitor number 5 - and another dead horizontal band. Perhaps I can look at reflowing the solder, or again, if I’m lucky it could just be a bad cable or loose connection internally.

I also worked out why they didn’t come with power supplies and it’s quite interesting. It seems the VGA cable has - and someone’s actually labeled this “AC out” - I don’t know if you can see that - the VGA cable also has the power cable built in, and of course these DigiPOS Point Of Sale PCs originally, with the original power supply, actually had an output on the back for powering the monitor.

So I decided to start at the beginning with.. er.. well. Monitor number 6. In addition to a broken backlight, this one has small surface scratches all over the screen itself so I wasn’t too bothered if I damaged it, meaning it would be excellent practice for tearing these things down.

As with many older LCDs, these screens are a somewhat loose sandwich of separate layers - with a white reflector at the back, a clear diffuser to spread the light of that tiny fluorescent tube at the top, and finally the actual LCD at the front.

Setting this one aside for spares, I decided to see if I could transplant the backlight from monitor number 4 - the one with the big dent in it - into monitor number 2, which seemed to be in otherwise good condition.

So stripping down monitor number 4, I can see that the internals are in much better condition, with no broken plastic to be seen. In fact, if it weren’t for the big dent in the screen and resulting band of dead pixels, this one might actually be the nicest example here.

You see, I popped open the intended recipient - screen number 2, and immediately I can see that something is amiss. The LCD controller board is completely different to the 2 I’ve already seen, and further disassembly reveals that the black surround around the screen - which I assumed was part of some kind of privacy filter or what have you, actually turns out to be a bezel designed to hide the fact that the panel itself is too small for the frame.

Still filled with determination, I realised that the first screen I’d torn down - number 6 - was the only other non-bezel variant I had in need of a backlight, so - despite those light scratches on the front - that would be the recipient of the backlight I’d salvaged from monitor number 4.

The panel from monitor number 4 also has a nice solid black plastic internal frame, as opposed to the shattered one on panel number 6. But the ribbon cables look delicate and I don’t really want to risk damaging them, and the broken plastic is only in one corner anyway, so I stuck with the broken one for now.

Going back to my notes, it seems like a backlight swap from monitor 5 into monitor 2 - which as you’ll remember, I stripped down earlier in the hope that the backlight from number 4 would fit - should yield results.

So I set about dismantling monitor number 5 to salvage its backlight and… ooh, it seems this is an IBM panel - very fancy indeed. Comparing the two side by side - the other one being made by Sharp - it seems the tubes might be the same size despite the panel being assembled slightly differently, but further teardown reveals that backlight number 5 is actually a completely different shape and wouldn’t fit into panel number 2.

Rapidly running out of options, I decided that monitor number 5 with its IBM panel might actually be repairable, so set about on a last ditch attempt to fix that dead horizontal band. Somehow this monitor now also had a broken power switch, which shouldn’t really be surprising after everything else that’s gone on, but at least poking around the screen actually yielded some promising results for a change. Perhaps my luck was finally turning.

So with soldering iron in hand and all other options seemingly exhausted, I thought I’d have a go at reflowing the connector. In hindsight, perhaps doing this with the monitor powered on wasn’t the best of plans, but it was a last ditch salvage attempt after all, and er… Yeah. Nevermind.

So I decided to cut my losses, throw these 4 broken monitors onto the ever growing repair pile, and fire up trusty old monitor number 3 aga- oh, great. Not only does it have these vertical lines, it’s also so dim that I wouldn’t be surprised if the backlight on this one failed as well, sooner rather than later.

I think it goes without saying that these monitors have evidently had a hard life - so for my £38 I’m left with one screen that works pretty well but is a bit on the dim side, one that works OKish with the occasional poke but in all honesty probably won’t work for long, and a big pile of e-waste that - to be honest - I doubt I can even take them to the dump as they’ll probably accuse me of trying to offload commercial waste.

So if you have any suggestions for projects that I could do with these dead monitors, do let me know in the comments - maybe fitting a modern IPS panel would be a fun experiment, or e-ink, or coming up with some kind of backlight solution for the original panels for the couple that need it.

4x 3G-SDI and 4x HDMI digital video inputs with flexible channel assignments provides connections to the latest video sources, including cameras and DSLRs. Incoming video sources do not have to be genlocked due to Ki Pro GO"s input frame syncs. Ki Pro GO also features AJA"s high quality de-interlacers on each input so progressive recordings can be made from interlaced inputs. High quality 2-channel embedded audio or balanced XLR analog audio can be assigned to any recording channel. Multi-Channel Matrix Monitoring enables multiple video channels to be viewed on any single HDMI or SDI display, and Enhanced Super Out offers timecode, media status and audio meter overlays over the SDI and HDMI monitor outputs.

The video and audio connections on the rear panel of the Ki Pro GO offers 4x 3G-SDI and 4x HDMI inputs with separate SDI and HDMI monitoring which includes Matrix Monitoring for multi-channel viewing on a single HD display. XLR Analog Audio in offers Mic, Line and Phantom Power for audio recording from master sources, mixers and more. HDMI and SDI 2-channel embedded audio or the XLR analog inputs can be easily assigned to each recording channel. Alternatively, you can use the second Analog Audio input as a LTC input.

HD HDMI and/or SDI monitors can be fed from Ki Pro GO"s SDI and HDMI monitoring ports to display up to four channels of video in a matrix at a time per display or alternatively you can choose to send a full screen single channel of your choice to either output, allowing both matrix viewing and close up detail inspection for a channel of your choice.

This flexibility ensures multi-camera shoots can be monitored on a single monitor when desired, with no matrix converter or independent monitors required for the utmost in efficiency and convenience.

Enhanced Super Out provides a timecode overlay, per chanel audio VU meters and media remaining percentages over SDI and HDMI Monitor outputs, putting what you need to know, where you need to see it.

Ki Pro GO features a beautiful high resolution large HD display with Video Monitor and Menu/Status Overlays for pristine monitoring of your material and serves as your interface to Ki Pro GO"s familiar and intuitive menu system. The detailed overlay UI includes onscreen keyboard functionality and a clear view of the powerful yet simple to operate UI, all pristinely presented on the HD LCD display.

The current status of the system and key configuration information is clearly displayed on the beautiful built-in high resolution LCD screen. Additional operational information can be found in the STATUS menu which can be accessed even when recording or playing back.

The STRIX and Amigo are portable, handheld electronic magnifiers with an adjustable angle and 7-inch and 6.5-inch TFT (thin film transistor) display screens, respectively. Both have a display-freeze feature that allows you to take a temporary picture of what is on the screen, and both have a stand to facilitate short handwriting tasks. Both have adjustable magnification levels and various display modes. Although these devices are similar in some respects, they most likely will be used differently, as I discuss later in the article.

The STRIX has an autofocus camera, can be used for reading and writing, and can be held up to magnify images across the room. The device can magnify from 4 to 22 times on its integrated 7-inch TFT screen. In addition to its full-color (Photo) mode, it displays images in high-contrast black on white (Positive) and high-contrast white on black (Negative) modes.

As was mentioned previously, the STRIX can be connected to a computer through a USB2 port and by running its optional Frame Grabber software. The STRIX can also be connected to a television or video monitor to provide higher levels of magnification. Its built-in writing position allows it to be tilted at an angle to facilitate the writing of short notes and signing documents.

This mode is activated by pressing the AF button twice. At this point, the red LCD (liquid crystal display) light begins blinking to indicate that you are in Super Far Vision mode. This mode is used for viewing objects farther than 6 feet away; for shorter distances, Far Vision mode should be used.

The Amigo, which weighs 1.5 pounds, is designed for reading and writing. It can magnify from 3.5 to 14 times on its integrated 6.5-inch TFT display screen and can be connected to a separate television or video monitor for higher levels of magnification. It has six viewing modes: Full Color, Black and White, High-Contrast Positive, High-Contrast Negative, Yellow Text on a Blue Background, and Yellow Text on a Black Background. Your last magnification and viewing mode settings are automatically saved when you turn the Amigo off and are restored when you turn the device on the next time.