Re: Another help question. power supply

From: Patrick Garber <patnukem_at_email.domain.hidden>
Date: Thu, 5 Apr 2007 03:26:21 -0500

After some more testing I found that the power might be good I did replace 6 caps all were the same kind. Now I have to figure out what is wrong. when I turn on my lisa the light now comes on everytime, never happened before. but no beep or picture. I have tried two different cpu boards and two different mem boards. No picture on the external connected monitor. Earlier tonight I did see a white flash or two on the monitor so I think that the tube on the monitor is still good. Could the video card ( the one behind the picture tube) need fixed? any sugestions? On a side note someone I have been in contact with might have a lisa still in a box hardly used if at all. don't know what model or anything but might be getting it :) if they are not trying to pull my leg :)


On Mar 21, 2007, at 9:56 AM, tommoni wrote:

> Hi Patrick,
> very very very likely that one of the secondary diodes has a
> shortcut. So before you solder out all the caps, first try to make
> some measurements instead of a try-and-error-repair :-)
> There's only one big dual-diode (looks like a transistor in the
> metal-housing) which is probably the bad one if you describe that
> clicking-sound. It's overcurrent shut-down, because that diode has
> a shortcut. Try to measure with an ohm-meter one of both contacs at
> the soldering side with the housing of that diode. There must be
> one good and one with less than 0,5 ohm. Else try all the diodes
> vertically mounted, they could be bad too
> greetings TOM from Bavaria, the center of europe, the marvellous
> castles of Koenig Ludwig e.g. Neuschwanstein and last but not least
> the original Oktoberfest !
> Am 21.03.2007 um 11:13 schrieb Patrick Garber:
>> Could the "solid state relay" be bad? Because I hear
>> clicking when I hold the power button in. I read this http://
>> Thank you
>> Patrick
> >

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Received on 2015-07-15 16:37:11

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