SOURCE: my lg-50PG20 powers up and has sound but no
Study the screen at several different angles; you should be able to see some ghostly images if the video chain is OK. If you can see this, either the backlight supply or fluorescent light source has failed.
SOURCE: HOW TO REPLACE BLOWN FUSE
Look for a reset button on the back--push to reset. If trips again, unit has probable short.
SOURCE: My LG refrigerator has a blown fuse on the circuit
Yes. This fuse is replaceable, but, you will heed to De-solder the contacts, in order to remove the damaged fuse. this can be very challenging. If you are not an avid user of a soldering iron, i would just simply replace the board. If the soldering is not done correctly, this will cause the board to short, causing a spark.
I would , also, verify that the fuse is available for a non technician to purchase. Most vital components will not be available for purchase, if the purchaser is not a certified tech.
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SOURCE: LG 42PX4MVH PLASMA TV - Sound but no picture.
I have the same issue with my LG 42PC3DVA and I narrowed it down to the Y SUS board. After a little research there are a few items that are prone to go. The ceramic fuses (as you found), sometimes the capacitors on the Y SUS, Z SUS, and power supply go along with them You can tell because thy will be bulged at the top instead of flat. I replaced a few of my capacitors - they are only $0.89 each so it was MUCH cheaper than a board.
The other thing that is common on the Y SUS in particular are the FETs (also called MOSFET). They can be replaced if you are good with a soldering gun but they are static sensitive so be grounded. They are also a bit tricky to test so you may want to do some research on how to determine if this is the issue... or you can just replace the whole board.
SOURCE: LG Frig LFC23760ST 3 Door French Refrigerator : No power!
LG LFC23760ST
I recorded a 2 part movie clip on how I repaired the blown fuses on my LG refrig's circuit board.
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