On 11/30/2005 at 3:51 PM Julian Wolfe wrote: Perhaps--or not. That's the problem when things start going "poof" and turning all brown and crunchy, particularly in HV or power circuitry. Multiple failures are not uncommon. Just because you've replaced the visibly bad components, it doesn't mean that there are still more problems lurking that you can't see. Cheers, Chuck

Shouldn't do. The VT100 power supply has overcurrent protection and will shut down without damage if the load (video board, etc) is shorted. Does this supply work at all? Are you getting any output voltages from it? Have you checked the resistors (out of circuit -- that is with one end desoldered from the PCB) to see if they are burnt out (open circuit), or wildly different resistance from the value specified by their colour bands/markings? -tony

On 12/1/2005 at 12:51 AM ard at p850ug1.demon.co.uk wrote: No, but a tip that says "C303 is shorted, replace" actually gives me something to check for. The last time I used the Euras tips, it was precisely this situation--a GE-chassis 12" set that wouldn't power up. Power was controlled by an MPU connected to the pushbuttons on the front; the MPU had +5 on it, no part number or configuration that I recognized, so what to do? Most folks would throw the thing into electronics recycling, I suppose. But I spent my $5 on the Euras site (you can search for the problem report for free) and verifed that the cap indicated was indeed shorted. Replaced it with a higher WV rated cap and the set's still working a year later. It would have taken quite a while to otherwise probe and locate the faulty component. Some stuff however, doesn't seem to be worth repairing when it stops working. When I came home the other day, I found a socket 462 ATX mobo (sans CPU and memory) on the kitchen table. I asked my wife where it came from and she said that a friend had dropped it off for me. A call to the friend revealed that the mobo was faulty and he'd replaced it and--isn't life grand?--thought I'd like the old one. Well, I suppose the ZIF socket might be worth something, and there's always the button cell--but what else is salvageable? There's a bunch of SMT stuff that I could remove against the time that I might need it, but it seems scarcely worth the effort. Cheers, Chuck

If you run a reapir shop, I can see the use of them. Probably 90% of all fauts are 'stock faults' and can be found in the database. It'll get those units off the bench quickly. And I've heard of repair shops that look for the stock faults and if it's something else, they return the unit as being beyond repair (OUCH!). However, they seem to be a lot less use when it's a one-off unit which you need to repair no matter what (like a classic computer). You're going to have to do real fault diagnosis sometimes anyway, it doesn't make it much more difficult to do it properly every time. Alternatively you could get out he schematic, _understnad it_ and work out what components could cause this problem. -tony

Conversely, the fault has probably appeared on that unit, been repaired with better-rated components that don't fail again, so the current fault is due to something totally different :-) Are you seriously telling me the ICC9 service manual is not available anywhere? Because I find that very hard to believe (our TV, based on the ICC5 chassis, came with a sheet entitled 'customer service information' One side was a schematic, the other side was the layout and alignment instructions). -tony