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one last dead system question
Miscellaneous PC Hardware Miscellaneous PC hardware topics (comp.sys.ibm.pc.hardware.misc)
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#21
 
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Re: one last dead system question -
11-27-2006
, 01:49 AM
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On Wed, 22 Nov 2006 15:37:23 GMT, Chris christo9 (AT) notalotofunwanted (DOT) aol.com> wrote: Thanks for the help so far, I am going to replace the caps with the lower rated caps (1200uf vs 1800uf). Somone posted that replacing caps on multi-layer boards was very difficult. The 3 caps that caps that need replacement go all the way through the board and are soldered on the back of the board. I am assuming that I can just de-solder the old caps are solder on the new caps without a hitch. My soldering skills are so-so, but I have soldered and desoldered chips from old boards before. For example, I replaced the bios chip from an Atari 7800 system board with a new bios chip to make a cart dumper. Any advise? Would this be beyond my skill level? Chris If life seems jolly rotten There's spmething you've forgotten and thats to laugh and smile and dance and sing! So much pain in you-know-where to salvage an obsolete board that wasn't a good value even when new (ecs aka pcchips - bad caps are the proof). These days, a board like this (not the same model, but the same socket) - new, warranty and all, can be had from Newegg for under $47 shipped, from ebay even cheaper but no warranty. OTOH, you have to pay for capacitors, soldering iron and solder(unless you already have it), wick or vacuum de-solderer, spend at least an hour of your time - probably even more. The chances for success are not more than 50% - I'm generous with the number. Isn't it easier to just replace the board or upgrade the whole thing to A64? |
replacement could end up including a CPU, memory and a PSU... and maybe
even a case if the mbrd is old. Then if Microsoft gets nasty you've got a
"purchase" of a new WinXP key. At some point it gets to tossing a whole
system.
Assuming *some* soldering skill, the chance of success, from what I see, is
entirely dependent on the local heat capacitance around the capacitors -
some people have managed with a 30W iron - others have reported having to
use a 60W. Being capacitors the chances are that at least one leg is
connected to a largish plane.
--
Rgds, George Macdonald
#22
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#23
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On Sat, 25 Nov 2006 12:25:21 +1100, Franc Zabkar fzabkar (AT) iinternode (DOT) on.net> wrote: On Fri, 24 Nov 2006 02:28:15 -0500, George Macdonald fammacd=!SPAM^nothanks (AT) tellurian (DOT) com> put finger to keyboard and composed: On Fri, 24 Nov 2006 07:00:05 +1100, Franc Zabkar fzabkar (AT) iinternode (DOT) on.net> wrote: On 23 Nov 2006 06:58:10 -0800, "Rthoreau" <rthoreau (AT) iwon (DOT) com> put finger to keyboard and composed: I guess the next question would be is what is the going rate to sendit to a dedicated place that does this kind of work. Take it to a workshop that solders and desolders components for a living, eg a TV/VCR/audio repair shop. Are you sure about that Franc? I once worked in such a place. These shops employ *real* technicians, not just trained (or untrained) monkeys who can turn a Phillips head screwdriver. I thought all that most of those guys do now is unplug and re-plug modules? No, they do *real* component level repair. Just take the back off your CRT TV and tell me how many "modules" you can see. You'll probably only find one PCB. I haven't looked in a while. In a VCR I opened up a few years ago, the tuner, FM modulator, control panel and drum drive circuit were modules IIRC. |
may be the tuner, and some smt daughter cards.
See Chapter 1 of the Wagner catalogue for a list of audio/video semis.
Otherwise consult any VCR service manual for a complete orderable
parts list.
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The newer plasma and LCD TVs are a different story, though. Who in their right mind is going to pay to repair a VCR? Today, probably nobody, unless they have an investment in tapes, and have a quality machine. I certainly wouldn't pay someone to repair any of the current crop of VCRs. Just my situation. I had the misfortune, a few years ago, to get a Sony SLV-998HF -- not the highest "end" but it has flying head editing and was fairly expensive -- when my really old Hitachi "high-end" came back froma visit to the "shop" with a new problem. The Sony's FM modulator went bad in the first few months, which didn't bother me too much since I didn't use it. Now the tuner has gone bad and I'm more tempted to take my rage outon it than fix it. |
catalogue. Notice that some Sony models use the same kits as certain
Sanyo and Palsonic (low end) decks.
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Let me ask you: is it possible that a (Motorola) STB might blow the tuner on a VCR/TV? |
be possible to damage a tuner when hot connecting the cables. This is
because the chassis of an un-earthed 2-pin appliance generally floats
at half mains potential. I often see or feel a spark when
interconnecting such equipment.
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The Sony VCR's tuner went gaga a few weeks after we got a new cable co. STB when they switched over to digital - I'm kinda suspicious on this. |
where the component level techs appear to hang out.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
#24
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On Sat, 25 Nov 2006 06:20:31 -0500, George Macdonald fammacd=!SPAM^nothanks (AT) tellurian (DOT) com> put finger to keyboard and composed: Just my situation. I had the misfortune, a few years ago, to get a Sony SLV-998HF -- not the highest "end" but it has flying head editing and was fairly expensive -- when my really old Hitachi "high-end" came back from a visit to the "shop" with a new problem. The Sony's FM modulator went bad in the first few months, which didn't bother me too much since I didn't use it. Now the tuner has gone bad and I'm more tempted to take my rage out on it than fix it. Have a look at the video belt kits on pages 4-21 and 4-22 of the catalogue. Notice that some Sony models use the same kits as certain Sanyo and Palsonic (low end) decks. |
Sony just took a cheap deck and tarted it up with "features", apparently
using cheap add-on modules, but most of the mfrs did.
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Let me ask you: is it possible that a (Motorola) STB might blow the tuner on a VCR/TV? I have no significant experience in STBs, but I suspect that it *may* be possible to damage a tuner when hot connecting the cables. This is because the chassis of an un-earthed 2-pin appliance generally floats at half mains potential. I often see or feel a spark when interconnecting such equipment. |
switches/cards which claim that hot plug is "OK".
--
Rgds, George Macdonald
#25
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Arno Wagner <me (AT) privacy (DOT) net> wrote: snip :: So much pain in you-know-where to salvage an obsolete board :: that wasn't a good value even when new (ecs aka pcchips - bad :: caps are the proof). These days, a board like this (not the :: same model, but the same socket) - new, warranty and all, can :: be had from Newegg for under $47 shipped, from ebay even :: cheaper but no warranty. OTOH, you have to pay for :: capacitors, soldering iron and solder(unless you already have :: it), wick or vacuum de-solderer, spend at least an hour of :: your time - probably even more. The chances for success are :: not more than 50% - I'm generous with the number. Isn't it :: easier to just replace the board or upgrade the whole thing :: to A64? : : I would say it is not about cost-efficiency. It is about : having the : power to repair a thing and demonstrating it. Then you have WAY too much free time on your hands, jackoff. |
complete fool of himself in every thread he posts to.
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