Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Phimor
 
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Default Beovision 8800 no spot killer

I was hoping for some insight by more experienced people on this one:

Short version:
After repair (HOT) TV works fine, but spot killer is inadequate. Bang
and Olufsen Beovision 8800, approx 25 years old.

Long version:
I'm a complete newbie with this. I got the TV for nothing, and using
Sam's FAQ I diagnosed a blown HOT (BU208), replaced it, and the fuse,
and presto the set came on. A slightly bright picture and inapropriate
range in the brightness control got me to experiment with the pot on
the neck of the tube. Adjusted to a better range, and I now can get a
black screen when the brightness is set to zero. The picture is
stable, bright and I found a 'one for all' remote to work (most)of
the user functions.

So far so good. The only disappointment is a bright spot for a few
seconds after the set is turned off.

Turning off, the screen goes dark for a split second, then the spot
appears, also for a short time (less than 3 seconds) and fades off.

Now, given the age of set and the outrageous price I paid for it, and
my complete inexperience in the topic, maybe I should think myself
lucky and leave at that. But I would be surprised to think a BO set
would have this 'feature'. Also, maybe, I think a total fix might be
within reach, only if I new where to look (a weak supply capacitor in
the horizontal oscillator, for example).

Call me sentimental, but this is the first TV I have fixed. It would
be nice to get it 'just right'. Also I hate sending stuff to
land-fill unnecessarilly - I assume the tube will not last long
before a 'burn in' in the centre of the screen.

Please help me finesse this job and indulge my obsessive tendencies
;-)


Thanks

Philippe

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Rono
 
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Default

The "flash" you see, may be normal for the unit.
Make sure you check the solder connections @
the horizontal drive section, & replace the capacitor,
if it's electrolytic ( polarized..has a plus, & negative).
Rono.


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Phimor
 
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Default

Thank you Rono,

I will try changing more of the electrolitics. I changed one that
looked obviously like a culprit and had to re-adjust the
brightness...so it did something.

I thought a set of the calibre of this B&O would have some kind of
'spot killer'..


Cheers

Philippe

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