Tek2465b no trace!

[Teknow]

Hi everyone,
Today, my Tek2465b stopped working. I used it for about an hour then I turned it off for about 20 Minutes. And when I came back to work on a circuit, I turned it on but it ran no self test, instead it jumps to only the trigger LED flashing!
There are no traces or signs on the screen, it's off!
Neither the focus, nor the intensity nor the beam finder works!
I turned it off and on many times after cooling it, though not hot, but nothing changed.
I wonder if someone has ever a similar fault or can help me where to start. The fan is working, the fuses are all OK the five volts in the logic area are present!
I bought this device an changed almost all capacitors in the power board and the three leaking smd capacitors! The U800 has been supported with extra heat sink!

[singapol]

Try reseating connectors..that is removing them and pluging them back in. This is the easiest to do because I
don't know your repair skill level.

[Teknow]

Thanks a lot, I tapped on it, and it worked fine! Should I use some cleansing spray for the contacts like WD-40, for instance?

[tggzzz]

Thanks a lot, I tapped on it, and it worked fine! Should I use some cleansing spray for the contacts like WD-40, for instance?

Probably not WD40, since that is principallyt for Water Displacement.

Many people recomment Caig DeOxit products. Their website is extremely poor about guiding you to which is most useful for your circumstances.

[Teknow]

The humidity level in my apartment calls for placing some silica gel bags inside the device. Caig's products are not available in my vicinity. I think I can find some Kontakt products somewhere around here.

[Zucca]

Probably not WD40, since that is principallyt for Water Displacement.
Many people recomment Caig DeOxit products. Their website is extremely poor about guiding you to which is most useful for your circumstances.

well...

http://www.ietlabs.com/pdf/Manuals/1433_im.pdf

Page 8:

Should switch contact cleaning or lubrication
be required, as may be indicated by an
increase in the zero resistance, this may be
done be spraying the switch contacts with
a conditioning compound such as WD-40
or Deoxit from Caig Laboratories, or Super
Lube with PTFE from Synco Chemical Corp.

In my personal experience WD-40 is fantastic to remove old crap on metal surfaces (not plastic, since WD40 attak plastic material), then when you have a clean area put something for the long term (Deoxit, contact grease, etc.).
Just my $.02.

[tggzzz]

Yes There is a lot of "personal experience" and "sales literature", and it is very difficult to distinguish truth from fiction.

I've just used a tiny amount of Deoxit while resurrecting a Tek 485. A timebase relay had been inserted backwards (actually an easy mistake!) and when inserted correctly it was making intermittent contact with the socket. A pin-head sized drop of Deoxit on each socket contact, some waggling, and it is perfectly satisfactory.

Be aware that different plastics are susceptible to different chemicals (even IPA in some cases, apparently), and it is very difficult to know what will/won't happen. Theg only global statement is therefore to try the chemical on an unimportant part, and wait several hours to see what happens.