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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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19th Nov 2020, 1:28 am | #21 |
Hexode
Join Date: Mar 2012
Location: Liverpool, Merseyside, UK.
Posts: 453
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Re: Faulty CRT Computer Monitor
Checking the model number I see it is for the CPC+ range of home computers so will be a standard resolution CRT similar to those in portable TV's of the era. Even in the 90's when these weren't that old this problem was cropping up regularly. I think it is something to do with the composition of the wedges, probably a similar kind of thing to those rubber belts that turn to goo over a number of years. Some sets had grey wedges and I never saw this problem where they were used.
If you really value the monitor you could probably use a CRT assembly from a 14 inch portable TV, if you can find a good one. I know I did this with the earlier CPC monitors. |
19th Nov 2020, 12:53 pm | #22 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Faulty CRT Computer Monitor
The 'water' on the wedge might be an acidic byproduct of some decomposition.
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19th Nov 2020, 2:54 pm | #23 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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19th Nov 2020, 10:07 pm | #24 |
Triode
Join Date: Nov 2020
Location: Surrey
Posts: 26
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Re: Faulty CRT Computer Monitor
I’d be interested to see how you get on with this. I too own one of these and dread the day mine stops working.
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19th Nov 2020, 10:14 pm | #25 |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
I went and picked it up. It has a Philips tube in it. Its working ok but I'm not convinced I'm going to be able to swap the tube over. I was hoping it might be a straight swap but not convinced. Need to clean it up, discharge and see what it's like. I guess worst case I just use this instead. Its the right colour case and is a good match for the computer.
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19th Nov 2020, 11:58 pm | #26 |
Hexode
Join Date: Mar 2012
Location: Liverpool, Merseyside, UK.
Posts: 453
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Re: Faulty CRT Computer Monitor
Despite the dirty inside, that does look quite a bit newer than the monitor.
If it's in good working condition I would be inclined to keep it in one piece and use it as you say. |
20th Nov 2020, 9:21 am | #27 |
Hexode
Join Date: Nov 2010
Location: Market Drayton, Shropshire, UK.
Posts: 486
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Re: Faulty CRT Computer Monitor
Looking at the 2 picture in thread 25 this the same set as the mastui 14r or 14t. Be careful if swopping over crt , at the back of my mind is a idea about heater voltage being different on these 14ins tube.
Can you give us the full crt No off the label on the crt . regards Derrick Last edited by 1955APREN; 20th Nov 2020 at 9:25 am. Reason: spelling |
20th Nov 2020, 12:48 pm | #28 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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This is a nice TV and works fine via Scart so really it's more flexible than the old monitor, even the colour is a good match for the computer, the only downside is its mono and I don't have the remote for it. |
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20th Nov 2020, 2:10 pm | #29 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Faulty CRT Computer Monitor
It's not too late to take preventive action, i.e. removing the old wedges and glue, cleaning up and replacing them with other wedges from a different type out of a scrap set. Since the yoke needs to be removed and refitted, you should be prepared for some redoing of at least the dynamic convergence.
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20th Nov 2020, 4:23 pm | #30 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,498
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Re: Faulty CRT Computer Monitor
I may (note: may!) still have the scan coils from a Matsui 1420b 14" I scrapped for another fault a few years back. You would be welcome to them.
However, it will be some months before I can access them. If you don't mind the wait and can hang on to your Amstrad it might be a way to revive it. Meanwhile, perhaps other members could confirm compatibility between these two.
__________________
Regards, Ben. |
21st Nov 2020, 1:35 am | #31 | |
Hexode
Join Date: Mar 2012
Location: Liverpool, Merseyside, UK.
Posts: 453
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Re: Faulty CRT Computer Monitor
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The way I used to do it was to measure the resistance of the field coil windings and if they were fairly close I would do the swap, tweaking the height if necessary. Nothing to lose in this case. |
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21st Nov 2020, 5:52 pm | #32 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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25th Nov 2020, 11:25 pm | #33 |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
Hi all, I decided not to break up the Grundig as it's a nice fully working TV and don't want to end up with two broken sets but I picked up a free philips set, it works but the tube itself has quite alot of scratches on the face so isn't good for much.
I've attached some pictures of the numbering on the tube and was hoping someone in the known might be able to tell me if this is a feasible swap for the coils. Bit depressing to see this tube was made in the UK, probably make virtually nothing like this now, I guess the whole of Philips is a very different company now. Philips UK R&D once once just down the road from me in Redhill, the site bulldozed and is now a warehouse complex. |
26th Nov 2020, 7:27 pm | #34 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Faulty CRT Computer Monitor
The CRT label looks quite unfamiliar, modeled after the label used by their Taiwan CRT factory. If it didn't show UK on it I would have said it came from Taiwan, for sure.
The important part of the CRT label, the grey printing with the type number isn't quite readable. Could you take a close up picture of that? Also, could you have a look if there's any white stamping on the bell of the CRT? And maybe a picture of the deflection yoke? |
26th Nov 2020, 9:20 pm | #35 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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27th Nov 2020, 11:53 am | #36 |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
Extra photos. I could see any white writing the bell.
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28th Nov 2020, 12:41 am | #37 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Faulty CRT Computer Monitor
Strangely, it's not manufactured by Philips, and I don't know why it says UK on the label. The manufacturer is almost certainly Chunghwa (CPT) of Taiwan. Did they have a factory in the UK? The TV set itself was made in Poland.
EDIT: apparently, they produced picture tubes in Glasgow up until 2004 then went into insolvency and ended in 2015. According to glassdoor they were still taking job applicants in 2012 but they already wound down operations. Possibly they had a sales office for their LCD products.The Taiwanese mother company still exists. Also see https://find-and-update.company-info...589/insolvency Last edited by Maarten; 28th Nov 2020 at 1:02 am. |
28th Nov 2020, 9:22 pm | #38 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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As for whether it will work in my old Amstrad monitor I might just try it, take the PCB and plug it in and see what happens. The TV has some sort of intermittent issue as it won't always switch on and the tube has a few scratches on the face so really I have nothing to lose. |
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30th Nov 2020, 8:54 pm | #39 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Faulty CRT Computer Monitor
It is almost certainly made by Chunghwa in Glasgow. Philips did sometimes ask for custom labels on bought in CRTs. I've also seen "Philips" W76EKW tubes, made by Panasonic Germany (formerly known as SEL).
It might be good news for you, as the Chunghwa may be a closer match to the original tube. I'd try replacing the tube+yoke as a complete assembly first. |
30th Nov 2020, 10:01 pm | #40 | |
Triode
Join Date: Nov 2019
Location: Horley, Surrey, UK.
Posts: 20
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Re: Faulty CRT Computer Monitor
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