CRT decay

From: Geoff Roberts <geoffrob_at_stmarks.pp.catholic.edu.au>
Date: Tue Nov 3 22:26:19 1998

-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, 4 November 1998 14:50
Subject: Re: CRT decay
>> On this subject, but perhaps not quite on topic, I have a VGA monitor
>> which performs perfectly well if it is left on all of the time but if it
>> is switched off for more than an hour or so then it takes time for the
>> picture to reappear. Strangely it seems that the longer it is switched
>> off the longer it takes to 'warm up', in the extreme case after bieng off
>> for a week or so it can take half an hour or so for the pidcture to
>> reappear and the brightnedd will fluctuate for some time after that. Has
>> anyone got any idea what is happening?
>
>
>At a guess the first anode voltage (second grid for those across the
>Pond) is fluctuating. That'll affect the brightness but not much else.


Have a look for a low value, high voltage electrolytic capacitor in the
vicinity of
the G2 supply. Possibly even on the neckboard of the tube. Change it.
Sanyo TV's (others too, but Sanyos seem especially prone) exhibit this
problem also.

Cheers

Geoff Roberts
Computer Systems Manager
Saint Marks College
Port Pirie South Australia.
My ICQ# is 1970476
Ph. 61-411-623-978 (Mobile)
      61-8-8633-0619 (Home)
      61-8-8633-8834 (Work-Direct)
      61-8-8633-0104 (Fax)
Received on Tue Nov 03 1998 - 22:26:19 GMT

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