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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Broken Monitor.
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. |
#2
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Broken Monitor.
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. ===== "jmuller" wrote in message ... 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. |
#3
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Broken Monitor.
"jmuller" writes:
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? --- 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. |
#4
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Broken Monitor.
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. "Sam Goldwasser" wrote in message ... "jmuller" writes: 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? --- 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. |
#5
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Broken Monitor.
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. "Jerry G." wrote in message ... 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. ===== "jmuller" wrote in message om.au... 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. |
#6
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Broken Monitor.
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 |
#7
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Broken Monitor.
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 wrote: 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 |
#8
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Broken Monitor.
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 "Joe Smith" wrote in message ... 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 wrote: 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 |
#9
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Broken Monitor.
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 "jmuller" wrote in message om.au... 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 |
#10
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Broken Monitor.
"jmuller" wrote in message ... 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. |
#11
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Broken Monitor.
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/ +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. |
#12
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Broken Monitor.
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. "Sam Goldwasser" wrote in message ... 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/ +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. |
#13
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Broken Monitor.
I'd look at Sampo first.
"jmuller" wrote in message ... 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 ? |
#14
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Broken Monitor.
On Wed, 26 May 2004 23:21:53 +1000, "jmuller"
wrote: 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 "Sam Goldwasser" wrote in message ... 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/ +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. |
#15
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Broken Monitor.
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? "jmuller" wrote in message ... | 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 | | | | |
#16
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Broken Monitor.
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 "Tom MacIntyre" wrote in message ... On Wed, 26 May 2004 23:21:53 +1000, "jmuller" wrote: 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 "Sam Goldwasser" wrote in message ... 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/ +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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