Hi,
Thanks for the info but the monitor has no adjustments for cut off and gain
of the guns as this is done via a service mode or via service software.
There is a connector on the mainboard labelled 'SC' which has nothing
connected. Two of the pins are the SDA and SCL lines of the I2C bus so I'm
guessing SC means Service Connector and some sort of service jig attaches to
this for adjustment.

Adrian

"Sofie" wrote in message
...
Adrian Smith:
A 25 A transistor instead of a 20 A transistor WILL NOT solve the heat
problem........ the same amount of power will still be dissipated in the
form of heat..... the SAME amount of heat. Also, the gray scale problem
is NOT caused by scan coils but rather the CRT itself and the support
circuitry in the monitor...... usually there are adjustments..... over a
limited range... that will compensate for the RGB gun imbalance inherent
in
CRTs.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
------------------------------


"Adrian Smith" wrote in message
...
Degrees centigrade; the transistor is not too hot to touch but notably
hotter than another working unit with the original CRT.

"Sam Goldwasser" wrote in message
...
What's a few degrees?

--- 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.



"Adrian Smith" writes:

I have an Iiyama Visionmaster Pro 410 with a severely scratched CRT
face
which would not polish out. I replaced the entire CRT assembly
including
scan coils with one from a scrap Dell P791 which uses the same type
of
tube
(Mitsubishi Natural Flat 17") but different coils. A quick check on
the
coil
resistances proved them to be the same readings as the original but
I
cannot
check their inductance. I connected the rotation coil and the coils
for
convergence and found the image when powered up is sound geometry
wise
indicating the scan coils are probably compatible.

However, the line output transistor seems to be running a few
degrees
hotter
than normal, but the unit worked fine for two days. The greyscale
needs
adjusting slightly but this is not possible as I don't have Iiyama's
software to set it up.

It is too much hassle to swap the scan coils over between the two
tubes
and
I can live with the greyscale problem but would the monitor be OK
long
term
with these substitute coils? It was suggested to uprate the line
output
transistor to a 25A transistor instead of the fitted 20A but I don't
think
it will make much difference.

Any suggestions before I bin the old CRT?
Also does anyone have the service software for this monitor?

Any help would be greatly appreciated.

Adrian