Fuse blown repeatedly on CB553H-KL
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.
Nov 16, 2007 |
Compaq FS 7550 17" CRT Monitor