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Author Topic: Are metal frames safe for CRT televisions?  (Read 533 times)

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MiteWiseacre

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Are metal frames safe for CRT televisions?
« on: April 15, 2019, 11:42:30 pm »
Hi, I have decased my Sony KV 27fs120, discharged and built a frame out of angle iron stock which is bolted to the television ear mounts. I am nervous about powering it up after reading some vague comments saying those ears that the grounds are attached to are hot when the tv is powered on. This seems unlikely to me, should have have used wood? Is the entire frame really going to be energized?
Thanks for your help.

mohawk640

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Re: Are metal frames safe for CRT televisions?
« Reply #1 on: April 15, 2019, 11:52:52 pm »
They used metal frames in arcade machine

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MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #2 on: April 16, 2019, 12:02:26 am »
I read that arcade monitors use some kind of transformer to make the frame safe, anything further on this?

Edit: I tried powering it up and nothing. Doesnít even make a sound. Iím afraid I killed it somehow. Is there a main fuse or anything simple I can try to bring her back to life?
« Last Edit: April 16, 2019, 12:44:02 am by MiteWiseacre »

mohawk640

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Re: Are metal frames safe for CRT televisions?
« Reply #3 on: April 16, 2019, 12:47:25 am »
I read that arcade monitors use some kind of transformer to make the frame safe, anything further on this?

Edit: I tried powering it up and nothing. Doesnít even make a sound. Iím afraid I killed it somehow. Is there a main fuse or anything simple I can try to bring her back to life?
Some montior used transformer and other do not ,

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mohawk640

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Re: Are metal frames safe for CRT televisions?
« Reply #4 on: April 16, 2019, 12:48:47 am »
What are you trying to do?

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MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #5 on: April 16, 2019, 12:57:16 am »
Building a MAME cab, wanted to get the width of the television down so the cab would fit through doorways. So I decased it and made a frame for it. Really tried not to mess with any internals as I worked on it. Flipped it back up and attempted to power it up but it is unresponsive

Titchgamer

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Re: Are metal frames safe for CRT televisions?
« Reply #6 on: April 16, 2019, 01:48:30 am »
Building a MAME cab, wanted to get the width of the television down so the cab would fit through doorways. So I decased it and made a frame for it. Really tried not to mess with any internals as I worked on it. Flipped it back up and attempted to power it up but it is unresponsive

First thing to do would be check your mains supply to it with a multi meter if you get no response at all from it.

If thats ok then I would be looking at on board fuses.

MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #7 on: April 16, 2019, 02:52:00 am »
I broke the control board it seems    :hissy:

Titchgamer

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Re: Are metal frames safe for CRT televisions?
« Reply #8 on: April 16, 2019, 03:02:38 am »
I broke the control board it seems    :hissy:

What you do to it!?

MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #9 on: April 16, 2019, 03:40:49 am »
I think when I had it screen down I picked  it up out of the front plastic to set on a blanket, the main board likes to slide ahead out of its tray...
PSA - find a way to secure the board or get someone to help you, you might break something

Titchgamer

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Re: Are metal frames safe for CRT televisions?
« Reply #10 on: April 16, 2019, 04:44:18 am »
You actually snapped it you mean?

MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #11 on: April 16, 2019, 09:10:45 am »
Yah thereís a crack across it near the power button, Iím trying to find a replacement now. Found one for a 32 inch thatís similar but only one plug instead of two, hopefully the leads match up

Titchgamer

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Re: Are metal frames safe for CRT televisions?
« Reply #12 on: April 16, 2019, 09:19:18 am »
Damnn yeah thats pretty catastrophic!

lilshawn

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Re: Are metal frames safe for CRT televisions?
« Reply #13 on: April 16, 2019, 10:30:44 am »
I read that arcade monitors use some kind of transformer to make the frame safe, anything further on this?

While isolation transformers do provide a certain degree of safety, older arcade monitors used a regulator chip to make the high voltage power supply used to make the 20 some odd kilovolts of power used to drive the tube... an isolation transformer was used to isolate the AC mains coming in becasue one half of the incoming power (the neutral) is tied to ground. this does not work with this type of supply. the regulator backfeeds into the "ground" and kills the operator since it's not supposed to be connected to ground... effectively making the chassis HOT with high voltage. hopefully the chassis blows up somewhere and kills itself before the operator has a chance to touch anything metal. isolating the chassis still makes it HOT, just not in respect to ground...making it (more) okay to touch.

newer monitors/tv's use what's called a "switchmode" power supply. these have dedicated electronic power supplies that are used to power the various power rails needed in a monitor. these are already electrically isolated from the mains supply and tied to chassis ground already, and do not require isolation.

if a TV/monitor was made in the last 30 years, it will have this type of supply. and the isolation transformer should probably be removed to eliminate them a source of issues later. arcade monitors only used the old regulator style for simplicity and cost to produce and eventually swapped to switched mode supply in the mid 90's (most likely becasue the regulators went end of life and weren't available as new parts anymore.)

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Re: Are metal frames safe for CRT televisions?
« Reply #14 on: April 16, 2019, 11:12:26 am »
Look up you local classified ad paper or sites. I found 4 KV 27FS120 for free here.
As a side note I also did remove one and made a frame for the cabinet but I used wood it works fine and with 2X4 it fit flush with the tube.

MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #15 on: April 16, 2019, 11:05:25 pm »
Thanks for the info guys!
Yah I saw a couple more identical Sony Ďs in the classifieds, can probably scoop another for $20
Such a shame though
These are less than 20yrs old so my frame sounds fairly safe.

MiteWiseacre

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Re: Are metal frames safe for CRT televisions?
« Reply #16 on: April 19, 2019, 09:01:48 pm »
Just an update/conclusion on this thread.
I attempted to soldier the broken control board, after doing so the TV powered on but kinda went crazy (be careful decasing these because the main board likes to slip out)
Found another kv27 f120 took it apart and swapped it into my metal frame, being more aware of how the process goes and what to watch out for. I suppose it was a happy accident ruining my last set because the picture and geometry on this one is way better!
At the end of the day, my all metal frame has not fried me yet. The TV was made in 2004 so Iím sure itís much safer than older models. I wouldnít state definitively that it is safe but it does seem to be relatively so.