Question about Compaq FS 7550 17" CRT Monitor

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Fuse blown repeatedly on CB553H-KL

I've got a fuse blown T5AH250V and i replaced it and the fuse blown again. what is the problem of my monitor? Can anybody help me fix my LG CB553H-KL monitor

Posted by benchly howard on

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2 Answers

Louie Role

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Hi,

Re your post/description on an LG CB553H-KL fuse blowing, this is indicative of an over current (>5Amps) flowing through the AC mains supply. If you are comfortable doing component level repair and familiar with electronic parts/circuitry, continuity tester and a soldering iron, please do passive (off-board) test of the following components:

D900 - bridge diode;
C908 (150uF/400V) - filter/power capacitor;
Q901 - regulator.

If Q 901 is shorted, pls likewise check ZD901, D910, R902 & 915.

Just to be sure/safe, check also:
C901, 902 & 904;
TH 901 & 902;

Though unlikely, you may want to check also:
Q706 - Horizontal out transistor (attached to the aluminum wall acting as heatsink;
FBT - Flyback transformer.

Other than the component aforementioned, no other parts would cause enough current flow to blow the fuse. But of course, anything can still be wrong

Hope this be of some help. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Nov 16, 2007

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Brundavanam Krishnamacharyulu

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Hello,

if it is under warranty contact the vendor where you purchased.  if it is not under warranty do not do on your own.  Contact the nearest expert to fix the error.  Its not only the fuse problem because you are saying that it had burnt so the corresponding ics may also got damaged.  Its better to contact the expert.

Let me know if your problem is solved and rate me as FIXYA!

Posted on Apr 25, 2008

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My LG flatron w1934s goes black when i turn it on, so please help me how i can fix it.


Look for bad caps with bulging/leaking tops.
Failed LG's: http://s807.photobucket.com/albums/yy352/budm/LG/LG%20W1934S/
If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

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Look for bad caps with domed tops in the power supply/inverter board first.
http://s807.photobucket.com/albums/yy352/budm/LG%20L1751S/

If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed LG monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

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If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed LG and other monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

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Monitor this gae will more likely to have bad DC filter caps: http://s807.photobucket.com/albums/yy352/budm/LG%20L1751S/

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
Capacitors kit: http://lcdalternatives.auctivacommerce.com/

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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed LG monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://s807.photobucket.com/albums/yy352/budm/LG%20L1751S/
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed LG monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

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Hi,

A monitor display showing "No Data" indicates that either the PC is not sending any usable video signal or the monitor is not capable of displaying the incoming video signal. To determine which is at fault, you would need either a known good second monitor or a known good second PC.

Additionally, it is also possible that neither is at fault and that you simply need to lower down the Screen Resolution and/or the Screen Refresh Rate of the computer's display properties to match the limitation/capability of the monitor. A method of verifying if this is the case is to start the PC in "Safe Mode" by pressing F8 after POST before Windows boot.

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Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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2 Answers

T5AH250V


Hi there

You can buy it from your nearest TV or AV Repair shop.

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