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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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29th Apr 2014, 10:44 am | #1 |
Retired Dormant Member
Join Date: Apr 2014
Location: Cardiff
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Dead Philips monitor
I've got an old Philips HD15 monitor. The screen is dead, the low voltages are OK, but there doesn't seem to be anything coming out of the HV transformer. I have only used a multimeter not a scope. Any tips would be greatly appreciated. Thanks
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29th Apr 2014, 12:00 pm | #2 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,185
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Re: Dead Philips monitor
What is the model number? It can usually be found on a label on the back.
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29th Apr 2014, 12:20 pm | #3 |
Retired Dormant Member
Join Date: Apr 2014
Location: Cardiff
Posts: 5
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Re: Dead Philips monitor
Thanks Maarten.
It's a UTAP20W |
29th Apr 2014, 1:25 pm | #4 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,185
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Re: Dead Philips monitor
That doesn't seem right either. Maybe you could take a picture of the label?
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29th Apr 2014, 1:32 pm | #5 |
Retired Dormant Member
Join Date: Apr 2014
Location: Cardiff
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Re: Dead Philips monitor
Hi Marten
thanks for your time, it is appreciated. I've just looked at the label and that is the correct model number. It is a medical monitor but does have ordinary VGA DVI inputs. |
29th Apr 2014, 2:56 pm | #6 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
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Re: Dead Philips monitor
Ah, then it is most likely made by FIMI, Sarrono Italy (formerly known as Phonola, later part of Philips, nowadays part of Barco). Very high quality equipment and certainly worthwhile preserving (I own and use one of the very few consumer monitors they ever manufactured). Finding a schematic is probably going to be hard, so repairing must be done by traditional fault finding while reverse engineering or at least recognising the circuitry. This is best started at the power supply. Most likely it should be putting out a +B around 100V and some low tension lines to the signal and control circuitry. The horizontal deflection and HV transformer may be in separate circuits.
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29th Apr 2014, 3:21 pm | #7 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,967
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Re: Dead Philips monitor
a quick web search gives this
HD15 - P/N: UTAP20W 4535 613 82311 20"lcd not one I have seen |
29th Apr 2014, 3:22 pm | #8 |
Retired Dormant Member
Join Date: Apr 2014
Location: Cardiff
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Re: Dead Philips monitor
Yes Maarten, it is made in Italy. Havent been able to cct diagrammes, but will look for the 100v. Thankyou so much.
Yes Fixitnow, thanks |
29th Apr 2014, 4:08 pm | #9 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
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Re: Dead Philips monitor
Check the power transistor that is driving the primary of the horizontal output transformer. It may be s/c collector-emitter.
Al. |
29th Apr 2014, 4:40 pm | #10 | |
Dekatron
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Re: Dead Philips monitor
Quote:
Rich
__________________
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29th Apr 2014, 5:01 pm | #11 |
Retired Dormant Member
Join Date: Apr 2014
Location: Cardiff
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Re: Dead Philips monitor
Thanks everyone
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