A question about fuses

B

bob

Guest
Hi,

The other day I posted about my Compaq P710 blowing up. Well it turned out
the be the mains fuse in the chassis. The one provided was an unmarked
ceramic bodied one but the markings on the PCB stated it is a 4A fuse.

I've replaced the fuse with a bog-standard 20mm 4A 250V glass bodied fuse
which works fine - until you power the monitor up about a day after
replacing it and it pops again.

The monitor functions perfectly fine with another new fuse poked in it after
this.

Would it be worth putting a slow-blow fuse in as there's a rather large
power spike when you power this monitor up which appears to be blowing it
again?

Cheers all,

- Chris.
 
There is something in the monitor that is going defective, and is causing
the monitor to pull too much current. The monitor should be properly checked
to service it. There may also be safety issues here.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"bob" <bob@bob.com> wrote in message
news:408bbd4d$0$31684$fa0fcedb@lovejoy.zen.co.uk...
Hi,

The other day I posted about my Compaq P710 blowing up. Well it turned out
the be the mains fuse in the chassis. The one provided was an unmarked
ceramic bodied one but the markings on the PCB stated it is a 4A fuse.

I've replaced the fuse with a bog-standard 20mm 4A 250V glass bodied fuse
which works fine - until you power the monitor up about a day after
replacing it and it pops again.

The monitor functions perfectly fine with another new fuse poked in it after
this.

Would it be worth putting a slow-blow fuse in as there's a rather large
power spike when you power this monitor up which appears to be blowing it
again?

Cheers all,

- Chris.
 
"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c6gi48$ejs$1@news.eusc.inter.net...
There is something in the monitor that is going defective, and is causing
the monitor to pull too much current. The monitor should be properly
checked
to service it. There may also be safety issues here.
Click to expand...
Joy!

No-one will service it round here (Nottingham UK) as it's more than 4 years
old. I have a dodgy copy of the service manual but they still don't want to
know.

It's only pulling current out of spec when powering up so I'll risk it for a
few weeks until I can afford to get another half-decent CRT. This is a 17"
FD Trinitron so I don't want to lose it if I can help it.

Cheers,

- Chris.
 
"Chris Smith" <c.s@scratchmonkey.removethisbit.org.uk> writes:

"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c6gi48$ejs$1@news.eusc.inter.net...
There is something in the monitor that is going defective, and is causing
the monitor to pull too much current. The monitor should be properly
checked
to service it. There may also be safety issues here.

Joy!

No-one will service it round here (Nottingham UK) as it's more than 4 years
old. I have a dodgy copy of the service manual but they still don't want to
know.

It's only pulling current out of spec when powering up so I'll risk it for a
few weeks until I can afford to get another half-decent CRT. This is a 17"
FD Trinitron so I don't want to lose it if I can help it.
Click to expand...
Don't know if that fuse is in series with the degaussing coil. If it is,
unplug the degaussing coil and see if the fuse still blows. If it doesn't,
either there is a problem with the Posistor driving the coil or the fuse
is the wrong type.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.
 
"Sam Goldwasser" <sam@saul.cis.upenn.edu> wrote in message
news:6w7jw4cdgo.fsf@saul.cis.upenn.edu...
"Chris Smith" <c.s@scratchmonkey.removethisbit.org.uk> writes:

"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c6gi48$ejs$1@news.eusc.inter.net...
There is something in the monitor that is going defective, and is
causing
the monitor to pull too much current. The monitor should be properly
checked
to service it. There may also be safety issues here.

Joy!

No-one will service it round here (Nottingham UK) as it's more than 4
years
old. I have a dodgy copy of the service manual but they still don't
want to
know.

It's only pulling current out of spec when powering up so I'll risk it
for a
few weeks until I can afford to get another half-decent CRT. This is a
17"
FD Trinitron so I don't want to lose it if I can help it.

Don't know if that fuse is in series with the degaussing coil. If it is,
unplug the degaussing coil and see if the fuse still blows. If it
doesn't,
either there is a problem with the Posistor driving the coil or the fuse
is the wrong type.
Click to expand...
It's the fuse in line with the mains inlet. There aren't any others in the
monitor that I could see.

Cheers,

- Chris.
 
"Chris Smith" <c.s@scratchmonkey.removethisbit.org.uk> writes:

It's the fuse in line with the mains inlet. There aren't any others in the
monitor that I could see.
Click to expand...
OK, unplug the degaussing coil (two pin plug) and run it like that.

If you have the schematic, check the fuse type - might be slow blow.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.
 
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