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Electronics Forum / Electronics / June 2004[MELB] HP A2094A monitor (Sony GDM-1934) for anyone interested
G'day folks, if repair techs, etc, are interested in the above 20" monitor they can have it as long as you can pick it up, (I'm on Mt Dandenong). I think it's a GDM-1934 variant, (after doing a Google search), it's fixed frequency, 1280*1024 72Hz 78.125kHz 5*BNC,(R,G,B,HD,VD), inputs & outputs. It might have a problem, I couldn't get it to sync to my PC output when set to 1280*1024 72Hz, but the Trinitron tube seems to be fine - at least what I could see of it as it was trying to sync. Anyone interested in doing a swap for approx. 4 high voltage film capacitors? Otherwise I'll start pulling it apart to see if I can get the parts I need for another Trinitron monitor - or if someone can send me the parts list for it from the Service Manual, I can see if it has the parts I need without pulling it apart. Thanks, Dave > It might have a problem, I couldn't get it to sync to my PC output when > set to 1280*1024 72Hz, but the Trinitron tube seems to be fine - at > least what I could see of it as it was trying to sync. How did you inject the sync? These monitors mostly take sync on green. I've had success operating workstation monitors from a VGA card under Linux (where I have complete control over scan settings) by hooking the Vsync and Hsync to the Green via a pair of 220 Ohm resisters. The video level is a little low, so you can't quite get full brightness, but that doesn't bother me, in fact I'm looking at an HP98752A (rebadged Sony) right now. Clifford Heath. >> It might have a problem, I couldn't get it to sync to my PC output when >> set to 1280*1024 72Hz, but the Trinitron tube seems to be fine - at [quoted text clipped - 7 lines] > but that doesn't bother me, in fact I'm looking at an HP98752A > (rebadged Sony) right now. I thought of that and have a small cct diagram for combining H & Vsync to give sync on green but couldn't be bothered trying it - was a bit more than a pair of resistors :) I just used the VGA->BNC cable, guess I could try puting the resistors on the back of the BNC connectors just so I can see if the monitor does indeed work properly but in the end I'd rather fix my IBM P70 multiscan, (Sony 17SE2T - reduced width problem), than be stuck with just one resolution/scan rate - also the P70 isn't quite so cumbersome! Suddenly got into this fix all the gizmos mode: NEC N9570A - requires idler assembly NEC 3D - replace all the electros (vertical foldover) IBM P70 - reduced width (try to replace HV caps - if I can find them) Sony SLC40ES - tape take up not quite working fast enough Couple of TEAC VHS recorders found during hard rubbish that require a bit of mechanical tweaking but otherwise record and play fine - the things people throw out. Still using a perfectly good microwave that someone threw out - couldn't have matched their new kitchen! The fun never stops :) BTW, if anyone can help, the 17SE2T manual lists some caps as: C432 1-113-714-11 FILM 2000pF 3% 2KV Anyone know where I can get caps of that spec, (besides genuine Sony parts), bearing in mind I only want small quantities, (ie. 1 or 2 of a value)? Also, when they say 'FILM', exactly what construction are they talking about? Looking at them I'd say polypropylene, which are suitable for the H output section. Dave > I thought of that and have a small cct diagram for combining H & Vsync > to give sync on green but couldn't be bothered trying it - was a bit > more than a pair of resistors :) Wouldn't mind seeing that - got a scanner or an electronic version? I run Linux where fixed scan isn't a problem, but even on Windoze if you use a dual-screen adapter a fixed-scan monitor works well as a 2nd screen. > I just used the VGA->BNC cable, guess I could try puting the resistors > on the back of the BNC connectors More-or-less what I did. Use -ve sync for both H and V. > BTW, if anyone can help, the 17SE2T manual lists some caps as: > C432 1-113-714-11 FILM 2000pF 3% 2KV I bought a pack of 3Kv caps from Oatley a while back with the thought of building a Cockroft-Walton voltage multiplier for an ion generator. Never bought the diodes though. They're marked "B 152K CM04", so I guess that's 1500pF, pretty close to what you want. You're welcome to a couple if you pick them up (email heaths08 at optusnet dot com for location, Melbourne ES). Or I could drop a few in an envelope. > Also, when they say 'FILM', exactly what construction are they talking > about? Dunno, but not many types are made for that V rating, and I guess that's what matters. Clifford Heath. >> I thought of that and have a small cct diagram for combining H & Vsync >> to give sync on green but couldn't be bothered trying it - was a bit >> more than a pair of resistors :) > > Wouldn't mind seeing that - got a scanner or an electronic version? GIF file, I'll send it to the address you've given below. > I run Linux where fixed scan isn't a problem, but even on Windoze > if you use a dual-screen adapter a fixed-scan monitor works well as > a 2nd screen. That's what I'm testing it with, (ATI Radeon 9600 as the 2nd monitor). Under the display properties, (as I just discovered), I can set max vertical freq. (72Hz), max. res. (1280*1024), the HSync/VSync polarities and also composite sync. However, none of these provide compatibility with sync-on-green monitors, (according to ATI WWW site). But, (I obviously wasn't awake during my last reply), it shouldn't be needed since the monitor has inputs for HSync and VSync and I have the correct cable VGA->5*BNC. Sync-on-green would only be needed if I only had basic RGB, (3*BNC), inputs. Indeed, there's a website telling you how to mod a Sony GDM-1960/61 just by adding 2 more BNC sockets for HSync/VSync and a couple of resistors - apparently there are places on the input board just waiting for these components. It also has a link to another sync-on-green adapter. In case you're interested: http://vmlinux.org/jocke/mirror/www.geocities.com/SiliconValley/Foothills/4467/f ixedsync.html BING! Just realised, that page actually mentions a HP98752A, sound familiar :) success story done WITHOUT a sync-on-green adapter with Win95 - you may be able to set the monitor specs in Linux up the same. However, no matter what combination of sync I try, the monitor won't oblige - I can almost get it to do it if I play around with the Low H.Freq adjust on the main PCB, (they even supply a service tool in the monitor!). I've created space on the HD and will install Linux, (been a while since I used it last), and see if I can get it to work with that. >> BTW, if anyone can help, the 17SE2T manual lists some caps as: >> C432 1-113-714-11 FILM 2000pF 3% 2KV [quoted text clipped - 5 lines] > a couple if you pick them up (email heaths08 at optusnet dot com for > location, Melbourne ES). Or I could drop a few in an envelope. Thanks for the offer, I'll see how I go, got to make a list of everything I need for these repair jobs then see what I can get on my next journey "down from the mountain" :) Dave > How did you inject the sync? note original post: *5* BNC inputs - R,G,B,*VS*,*HS* |
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