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

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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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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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Posted on Jan 02, 2017

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Check the power supply DC filter cpas first.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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It may hace cold solder joints, failing DC filter caps, lamp assemblies.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague
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Check the DC filter caps.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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Post back what you see inside so we can guide you further and it will help out other people in the future also.

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If you are going to DIY and have proper tools and know safety precaution then please read on:
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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
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Jul 02, 2008 | Compaq FS 7550 17" CRT Monitor

2 Answers

T5AH250V


Hi there

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

Apr 01, 2008 | Panasonic PTL-520U 2000 ANSI lumens/SVGA...

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