Broken Monitor.

[jmuller]

I have an old (1997) SVGA computer monitor (labled FIG S567) which gets
blurry once it's warmed up. I feel the tube is still good because when cold
the picture is reasonably sharp.

It used to get blurry AND brighten up when it was warm. However I
re-soldered the flyback transformer and adjusted the 'SCREEN' voltage. It
does not appear to brighten anymore.

I am hoping this is a fixable problem, and am having trouble determining
just where the problem lies.

- jmuller.

 

[Jerry G.]

The focus voltage or the high voltage is changing. You will have to use an
HV probe to verify this. It is very possible that the HV multiplier is
defective, or a component(s) in the HV feedback for the HV regulation is
failing. Obviously the fault is thermo sensitive, by the way I interpret
your description.

--

Jerry G.
=====



I have an old (1997) SVGA computer monitor (labled FIG S567) which gets
blurry once it's warmed up. I feel the tube is still good because when cold
the picture is reasonably sharp.

It used to get blurry AND brighten up when it was warm. However I
re-soldered the flyback transformer and adjusted the 'SCREEN' voltage. It
does not appear to brighten anymore.

I am hoping this is a fixable problem, and am having trouble determining
just where the problem lies.

- jmuller.

 

[Sam Goldwasser]

I have an old (1997) SVGA computer monitor (labled FIG S567) which gets
blurry once it's warmed up. I feel the tube is still good because when cold
the picture is reasonably sharp.

It used to get blurry AND brighten up when it was warm. However I
re-soldered the flyback transformer and adjusted the 'SCREEN' voltage. It
does not appear to brighten anymore.

I am hoping this is a fixable problem, and am having trouble determining
just where the problem lies.

What effect does the FOCUS control on the flyback have?

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[jmuller]

When the is cold I can get it fairly focused. So the (static) focus controll
works. When warm 'optimim' focus is awful.

Thanks for you reply.

 

[jmuller]

If the high-voltage was drifting would this also be the cause of the
(SCREEN) brightness increasing ? According to my trusting (generic) block
diagram of a monitor (http://www.repairfaq.org/sam/mon1blk.gif) almost all
of the HV circuitry is in the flyback transformer. Assuming I don't have a
HV meter, how could I establish if the HV is badly regulated ? (I do have a
cheap DMM)

I think replacing the flyback would be almost impossible, as I can't find a
single trace of the company that makes the monitor on the net. (FIG (on the
back) 'first' (on the front) S567).

Thanks for your help.

 

[jmuller]

I have found:

'456 005-15 REV:8F
MFG:732 B0653

5102820015P
E13-7810M '

and

'WK.734'

on the 'heatsink' around the flyback transformer.
and

'452051-15 REV:4G
MFG:732 B0653'

on the circtuit board that plugs into the CRT.

maybe this can help somehow.
What is the process of replacing the flyback transformer ??

- thanks in advance,
jmuller

 

[Joe Smith]

These numbers mean nothing at all.the # to the fbt is on it.
The proccess for replacing the fbt is as follows.
Have at least40 watt soldering Iron,Wick,and a big help,
a solder sucker,,,basically you un-solder the old one and
install (solder) the other in its place.
joe.

 

[jmuller]

I'm sorry, I should have been more specific. I have the neccessary skills to
physically replace the FBT. I just don't know where to BUY a FBT. I'm in
Ausitralia, which often makes matters such as this worse.

Are FBT's fairly generic? Or are they more like HOT's in the way that there
is a different one for each model?

Thanks

- jmuller

 

[jmuller]

I have located MORE codes, this time off the FBT.
It is (from what I can see) labled:

' SAMP
1051
TDDCW'

All three came from different places on the FBT.
is this anymore help at all ?

Thanks- jmuller


om.au...

 

[James Sweet]

I'm sorry, I should have been more specific. I have the neccessary skills to
physically replace the FBT. I just don't know where to BUY a FBT. I'm in
Ausitralia, which often makes matters such as this worse.

Are FBT's fairly generic? Or are they more like HOT's in the way that there
is a different one for each model?

Thanks

- jmuller

HOT's are fairly generic, flybacks are very specific, they're almost always
custom made for a particular monitor model, when you replace one you need an
exact replacement or it flat out won't work.

 

[Sam Goldwasser]

Sorry, why do you think the flyback is bad?

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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| 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.

 

[jmuller]

I have limited monitor troubleshooting experience. All I know is from
completely reading http://www.repairfaq.org/sam/monfaq.htm#monmmm and
rereading the sections that might apply to me.

The monitor brightens as it warms up and losses focus. I am unable to
observe SCREEN voltage (as I don't have a HV meter, if there's a trick I can
use to read HV on a standard DMM please tell)

I'm not sure if the focus voltage moves at all. This makes it hard for me to
determine wheather I have a HV power supply problem, or something else.

I guess the thing that would really help me here is a crude (but safe) way
to observe wheather the focus or screen or HV voltages are moving at all.

I think B+ is stable because there are no deflection issues at all.

Obtaining a schematic or similar resource would be hard, as I can not verify
even who made the monitor (Google has let me down).

Thanks - jmuller.

 

[Mike Berger]

I'd look at Sampo first.

 

[Tom MacIntyre]

I have limited monitor troubleshooting experience. All I know is from
completely reading http://www.repairfaq.org/sam/monfaq.htm#monmmm and
rereading the sections that might apply to me.

The monitor brightens as it warms up and losses focus. I am unable to
observe SCREEN voltage (as I don't have a HV meter, if there's a trick I can
use to read HV on a standard DMM please tell)

I'm not sure if the focus voltage moves at all. This makes it hard for me to
determine wheather I have a HV power supply problem, or something else.

I guess the thing that would really help me here is a crude (but safe) way
to observe wheather the focus or screen or HV voltages are moving at all.

I think B+ is stable because there are no deflection issues at all.

Obtaining a schematic or similar resource would be hard, as I can not verify
even who made the monitor (Google has let me down).

Thanks - jmuller.

Did you check the FCC ID?

Tom

 

[techforce]

I agree. These Numbers do not appear to be valid.

Also to your advantage if you find an FCC ID anywhere on the Back or Bottom
Cover.
the Flyback Number 'usually' is on a White Sticker on the flyback. It may
not be readable unless the FBT is unsoldered, and you brush away the Dirt.
Sometimes then it reveals other Numbers on the Flyback not visible before.
Post the Location Number of the Flyback, and if there are any Part Numbers
or Manufacturer names on the Board its mounted to. Sometimes there is also a
large rectangular IC Chip near the front of the Board with a unique number
that will help determine who made the Board. Not sure if you mentioned the
Size of this Monitor at all? 15, 17 , 19 Inch etc?



| I have found:
|
| '456 005-15 REV:8F
| MFG:732 B0653
|
| 5102820015P
| E13-7810M '
|
| and
|
| 'WK.734'
|
| on the 'heatsink' around the flyback transformer.
| and
|
| '452051-15 REV:4G
| MFG:732 B0653'
|
| on the circtuit board that plugs into the CRT.
|
| maybe this can help somehow.
| What is the process of replacing the flyback transformer ??
|
| - thanks in advance,
| jmuller
|
|
|
|

 

[jmuller]

The FCC ID: is 'GKR567'

Grantee Code: GKR
Grantee Code Grantee Name Mailing Address P.O. Box City State/Country
Zip Code Contact Name Date Received
GKR Compal Electronics Inc No. 581, Jui-Kuang Rd. N/A Neihu, Taipei,
114 N/A / Taiwan N/A Allen Chen 04/15



I have found their website, which only has driver downloads on it.

- thanks jmuller