Long monitor warmup

D

DS

Guest
I've got a 20" Dell Trinitron CRT screen thats about 7 years old. Its been
going great until December when it started to take about 10 minutes to warm
up. Well now its up to almost half an hour.

Here's what happens: I push the power button (its a hard on/off; not a
standby); the green LED comes on and it degausses. It is then pitch black
(you know how normally when it is black it still has a some output.. not
anymore). It will remain pitch black without any sign that is alive (aside
from the LED) for about half an hour, then it suddenly comes to life in the
span of 20 seconds (from pitch black to a bright vibrant image).

If it flicks off into power standby mode even for a second (like when you
reboot for example), it will then be black for another 10 minutes before it
fades the image in (once again, 10mins of pure black, then a 20 second warm
up).

I don't think the tube is worn out since once its finished warming up it
works as well as day one.. I'm guessing its something to do with the
electronics.. any ideas what it may be?

Thanks in advance!
-Dan
nojunkmail.signups@rogers.com
(rem.ove no junk mail)
 
"DS" <nojunkmail.signups@rogers.com> wrote in message
news:lq0Lc.697$33z1.453@news04.bloor.is.net.cable.rogers.com...
I've got a 20" Dell Trinitron CRT screen thats about 7 years old. Its been
going great until December when it started to take about 10 minutes to
warm
up. Well now its up to almost half an hour.

Here's what happens: I push the power button (its a hard on/off; not a
standby); the green LED comes on and it degausses. It is then pitch black
(you know how normally when it is black it still has a some output.. not
anymore). It will remain pitch black without any sign that is alive (aside
from the LED) for about half an hour, then it suddenly comes to life in
the
span of 20 seconds (from pitch black to a bright vibrant image).

If it flicks off into power standby mode even for a second (like when you
reboot for example), it will then be black for another 10 minutes before
it
fades the image in (once again, 10mins of pure black, then a 20 second
warm
up).

I don't think the tube is worn out since once its finished warming up it
works as well as day one.. I'm guessing its something to do with the
electronics.. any ideas what it may be?
Click to expand...
Oop, forgot to mention it has a built in test thing where it displays the
color bars. It does the exact same thing for the test: takes 30 mins to warm
up, then the color bars fade in about 20 secs.
 
look for bad solder joints in area's that get warm.
also could be a bad cap.


DS wrote:

I've got a 20" Dell Trinitron CRT screen thats about 7 years old. Its been
going great until December when it started to take about 10 minutes to warm
up. Well now its up to almost half an hour.

Here's what happens: I push the power button (its a hard on/off; not a
standby); the green LED comes on and it degausses. It is then pitch black
(you know how normally when it is black it still has a some output.. not
anymore). It will remain pitch black without any sign that is alive (aside
from the LED) for about half an hour, then it suddenly comes to life in the
span of 20 seconds (from pitch black to a bright vibrant image).

If it flicks off into power standby mode even for a second (like when you
reboot for example), it will then be black for another 10 minutes before it
fades the image in (once again, 10mins of pure black, then a 20 second warm
up).

I don't think the tube is worn out since once its finished warming up it
works as well as day one.. I'm guessing its something to do with the
electronics.. any ideas what it may be?

Thanks in advance!
-Dan
nojunkmail.signups@rogers.com
(rem.ove no junk mail)
Click to expand...
 
Look for any possible cold solder connections, and test for any defective
parts that have probably become thermo sensitive with age. It is possible
that the tube is also very worn from age.

Personally, I would be looking for a new monitor, rather than investing time
and money on a 7 year old one!

--

Jerry G. GLG Technologies GLG
==========================


"DS" <nojunkmail.signups@rogers.com> wrote in message
news:lq0Lc.697$33z1.453@news04.bloor.is.net.cable.rogers.com...
I've got a 20" Dell Trinitron CRT screen thats about 7 years old. Its been
going great until December when it started to take about 10 minutes to warm
up. Well now its up to almost half an hour.

Here's what happens: I push the power button (its a hard on/off; not a
standby); the green LED comes on and it degausses. It is then pitch black
(you know how normally when it is black it still has a some output.. not
anymore). It will remain pitch black without any sign that is alive (aside
from the LED) for about half an hour, then it suddenly comes to life in the
span of 20 seconds (from pitch black to a bright vibrant image).

If it flicks off into power standby mode even for a second (like when you
reboot for example), it will then be black for another 10 minutes before it
fades the image in (once again, 10mins of pure black, then a 20 second warm
up).

I don't think the tube is worn out since once its finished warming up it
works as well as day one.. I'm guessing its something to do with the
electronics.. any ideas what it may be?

Thanks in advance!
-Dan
nojunkmail.signups@rogers.com
(rem.ove no junk mail)
 
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:10fqprj929adva1@corp.supernews.com...
look for bad solder joints in area's that get warm.
also could be a bad cap.
Click to expand...
hmm.. let me come clean here: I've played around with electronics before--
making circuits (mainly simple digital stuff), but I've never really played
much with complex analog systems.. so when you say bad capacitor, could you
be a bit more specific as to which capacitor I'm looking for (ie an
electrolytic or a ceramic disc), a rough idea of how many micro (or pico)
farads it would probably be, and whether it would be on the high voltage or
low voltage side of things? What would the function be of the capacitor in
this context be? Any other pointers would also be appreciated! A repair faq
or something similar would be fantastic :)

I have played around with some high voltage stuff before like a jacobs
ladder, and frankensteining camera flash units to large capacitor banks for
some fun, so I know the ground rules and dangers when tinkering around with
CRTs.

I'm thinking it probably is a bad capacitor as opposed to a solder joint
since it would make more sense as to why it is taking longer to turn on as
time passes (the capacitor holding less of a charge). A bad solder joint
probably wouldn't get progressively worse.

Thanks for the response Jamie!
-Dan
 
"DS" <nojunkmail.signups@rogers.com> wrote in message
news:YKjLc.455$Wb7.51@news04.bloor.is.net.cable.rogers.com...
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in
message
news:10fqprj929adva1@corp.supernews.com...
look for bad solder joints in area's that get warm.
also could be a bad cap.

hmm.. let me come clean here: I've played around with electronics
before--
making circuits (mainly simple digital stuff), but I've never really
played
much with complex analog systems.. so when you say bad capacitor,
could you
be a bit more specific as to which capacitor I'm looking for (ie an
electrolytic or a ceramic disc), a rough idea of how many micro (or
pico)
farads it would probably be, and whether it would be on the high
voltage or
low voltage side of things? What would the function be of the
capacitor in
this context be? Any other pointers would also be appreciated! A
repair faq
or something similar would be fantastic :)
Click to expand...
You should post this to sci.electronics.repair, and check
www.repairfaq.org for a whole bunch of info on troubleshooting and
repair of viceo monitors.


I have played around with some high voltage stuff before like a jacobs
ladder, and frankensteining camera flash units to large capacitor
banks for
some fun, so I know the ground rules and dangers when tinkering around
with
CRTs.

I'm thinking it probably is a bad capacitor as opposed to a solder
joint
since it would make more sense as to why it is taking longer to turn
on as
time passes (the capacitor holding less of a charge). A bad solder
joint
probably wouldn't get progressively worse.

Thanks for the response Jamie!
-Dan
Click to expand...
 
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