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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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27th May 2020, 12:51 pm | #1 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,498
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LOEWE 5281 TV chassis 110Q23
This, my main set, gave a bright raster with retrace lines upon powerup this morning. Measuring across the RGB o/p stage rectifier on the CRT PCB I'm only getting some 60v. No obvious burnups. Resoldered a few suspicious looking joints to no avail.
I'm working blind here as have no schematic despite a few web searches. The supply voltage appears to be derived from the LOPTmr pin 4, via R547 but it's a crowded board and not that easy to trace. Ring any bells for anyone?
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Regards, Ben. |
27th May 2020, 2:21 pm | #2 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: LOEWE 5281 TV chassis 110Q23
The rectifier should be on the chassis, as far as I remember Loewe.
The 110Q23 is also called Q2300, maybe this helpsin searching for a schematic. Does it have a Philips ESF/ERF tube? |
27th May 2020, 3:37 pm | #3 |
Hexode
Join Date: Nov 2010
Location: Market Drayton, Shropshire, UK.
Posts: 485
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Re: LOEWE 5281 TV chassis 110Q23
Hi Ben
Can you locate the point were the 200v ( apr) Arrives at the crt base, try tacking a 4.7uf 250v from this point to chassis if this clears the fault look for oc cap after the diode from the lopts . I might have circuit in my shed I will look after Regards Derrick Last edited by 1955APREN; 27th May 2020 at 3:38 pm. Reason: spelling |