CRT Monitor - no signal


G

Guest

Been using a Hyundai 17" CRT Monitor (QV770) for about 2 years with Windows
XP Pro. Warranty expired.
Now the computer switches on but the monitor does not light up. I have tried
another TFT Monitor on the same PC with no problems.
Have checked all cables and even replaced the power cord. ELectrical fuse
changed also. I am reluctant to take it to a repair shop as they charge 10
Liri (about $30) whether the fault is rectified or not.
Any ideas please? Do monitors have fuses on the inside? Maybe it is only a
blown fuse? I hate to throw it away for something that can be rectified.

------------------------
 
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J

JS

Monitor may or may not have an internal fuse of the type you can recognize,
however it is not a good idea to open the case as there is a risk that 'High
Voltage' may still be present and you could be seriously injured.

JS
 
G

Guest

Thanks - appreciate your concern. Before opening the case, I want to be sure
there might be a replaceable fuse. I cannot understand how a good working
monitor wakes up dead the next day for no apparent cause!
 
B

Bob I

Humm, "wake up dead" is an oxymoron. The cause of death will only be
discovered through investigation. How big an autopsy can you afford, and
are you qualified to do it, or must you hire it out?
 
G

Guest

Well, I was thinking more on the line of "reviving"...anyhow, please excuse
my wrong choice of the English phraseology. I am certainly not qualified
being only a home-user, and trying to find out if anyone else had the same
experience and maybe could offer some advise to avoid costly repairs.
 
B

Bob I

Not a problem, but in actuality, a 17" CRT is almost impossible to give
away. New ones are extremely cheap, and used ones are almost free.
 
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G

Guest

Aha, but you live in the land of the plenty Bob (USA?) - not so in Malta!
New CRTs still cost approx US$190 here while used ones about US$70 - 75.
 
F

FeMaster

I have had this happen to a monitor of mine, just happens to have also been
a 17", but made by Princeton Graphic Systems. Fortunately, mine was still
under warranty at the time, and was replaced by another 17", but of higher
quality.

While you say it won't turn on, does that mean that it doesn't come on when
you turn the computer on, or is it completely dead as in no power light at
all? If the "power" is on, and it is just in "sleep" mode, it might be
possible that the cable went bad. Perhaps test by wiggling the cable with
the computer powered on, especially at the point in enters the monitor, and
the plug itself.

Another thought, most (but not all) monitors will turn on and display a
message similar to "no signal" if they are turned on, but not connected to a
computer. Might be worth a try, if the power light lights at all that is.
 
G

Guest

Thanks for joining in - and your useful suggestions.
There is no power LED light on the front of the monitor when connected to
the direct power source - it does not connect to the PSU. Also, there is no
screen activity as when you unplug the monitor from the PC while it's on. I
have tried another tested cable with no positive results.
I suppose this is the end of the line for this monitor as repairs are very
costly and not justified when TFTs are getting cheaper. Pity, though, I hate
to throw things away after only a 2-year spin.

------------------------


FeMaster said:
I have had this happen to a monitor of mine, just happens to have also been
a 17", but made by Princeton Graphic Systems. Fortunately, mine was still
under warranty at the time, and was replaced by another 17", but of higher
quality.

While you say it won't turn on, does that mean that it doesn't come on when
you turn the computer on, or is it completely dead as in no power light at
all? If the "power" is on, and it is just in "sleep" mode, it might be
possible that the cable went bad. Perhaps test by wiggling the cable with
the computer powered on, especially at the point in enters the monitor, and
the plug itself.

Another thought, most (but not all) monitors will turn on and display a
message similar to "no signal" if they are turned on, but not connected to a
computer. Might be worth a try, if the power light lights at all that is.
 
G

Guest

Thanks for the tip Jim - I'll be careful.
I do have a circuit/voltage tester and will give it a try... as you said...
nothing to loose.
P.S. I would have thought though that these things come with a fuse inside
the case. Would have been much easier I guess-but as I said earlier-not
technical but ordinary home user. I have built complete systems from scratch
but with working items. What goes on inside the "wired world" is a complete
mystery to me.
 
P

PA20Pilot

Hi,

.......I hate to throw things away after only a 2-year spin.

Since you don't seem to have much to loose anymore, you might as well
open the thing up and use a circuit/voltage tester to see if there's
life past the transformer.

As written earlier, there are some points in there that have the
potential to give you a good shock, sort of like a spark plug, so..........

---==X={}=X==---

Jim Self

AVIATION ANIMATION, the internet's largest depository.
http://avanimation.avsupport.com

Your only internet source for spiral staircase plans.
http://jself.com/stair/Stair.htm

Experimental Aircraft Association #140897
EAA Technical Counselor #4562
 
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A

antioch

Poltonis said:
Been using a Hyundai 17" CRT Monitor (QV770) for about 2 years with
Windows
XP Pro. Warranty expired.
Now the computer switches on but the monitor does not light up. I have
tried
another TFT Monitor on the same PC with no problems.
Have checked all cables and even replaced the power cord. ELectrical fuse
changed also. I am reluctant to take it to a repair shop as they charge 10
Liri (about $30) whether the fault is rectified or not.
Any ideas please? Do monitors have fuses on the inside? Maybe it is only a
blown fuse? I hate to throw it away for something that can be rectified.

------------------------

Ask Hyundai!
 
R

RalfG

20k+ volts at the flyback transformer... don't touch it. Doubt you'll find a
fuse. Nothing else inside the
monitor is user servicable unless you're a tech.
 
G

Guest

Being that you stated electrical things are a mystery to you, I suggest you
put aside the concern of the charge of troubleshooting the monitor and take
it to someone who knows what they are doing, and not take the risk of harm,
both to yourself and the monitor.
 
G

Guest

Thanks for your concern. I am surprised at the number of responses this post
is generating. It's great to know there are people willing to give time and
expertise to help others.
Regarding troubleshooting, I prefer to have a go first (within limits).
Funny thing is, I have not even managed to open the case! There is not a
single screw in sight, not even at the bottom end. Will wait for Hyundai's
reply.

If this "thing" revives, will let you know guys. Thanks to ALL.
 
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A

antioch

Poltonis said:
Thanks for your concern. I am surprised at the number of responses this
post
is generating. It's great to know there are people willing to give time
and
expertise to help others.
Regarding troubleshooting, I prefer to have a go first (within limits).
Funny thing is, I have not even managed to open the case! There is not a
single screw in sight, not even at the bottom end. Will wait for Hyundai's
reply.

If this "thing" revives, will let you know guys. Thanks to ALL.

Another thought is searching Google to see if there is a service manual you
can download(for free of course)but in all probability, you will get loads
of 'car' manuals :)
Also, before you find a way into the case, check that your life insurance
cover is up to date:)

Rgds
Antioch
 
G

Guest

--

Rgds
Poltonis
------------------------


antioch said:
Another thought is searching Google to see if there is a service manual you
can download(for free of course)but in all probability, you will get loads
of 'car' manuals :)
Also, before you find a way into the case, check that your life insurance
cover is up to date:)

Rgds
Antioch
-----------------------------------

By Jove, nearly forget to post the cheque to my Insurers! :)
Anyhow, if something goes wrong, I will send you a postcard from There...
wherever There is :)
 
B

Bob I

You have to be as clever as the case designer, it snaps together and
there are barbs that prevent it from coming back apart. Only way is to
find the barb/latches and pop each on loose. Tends to gouge up the
plastic if you aren't careful.
 
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M

M.I.5¾

Poltonis said:
Thanks - appreciate your concern. Before opening the case, I want to be
sure
there might be a replaceable fuse. I cannot understand how a good working
monitor wakes up dead the next day for no apparent cause!

Well they do. One of the common failure modes is a failure of the internal
power supply. As it is mosy likely of the switch mode variety, they are a
black art and beyond the scope of user repair. Besides, they harbour lethal
voltages above the normal mains voltage so need to be treated with respect.
 

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