Hey all,

I've had the MTX Audio RT8PT (powered subwoofer) installed in my '01 Subaru Outback for a little over a year, working flawlessly. Recently, it does this annoying thing where only plays once every 5.5 seconds. Upon inspection, the Thermal Protection light on the sub's integrated amp is illuminating when it is not thumping. The Owner's Manual does not offer any help other than telling me it is in Thermal Protection mode.

So something is causing it to go into protection mode every 5.5 seconds. Very weird that it's so periodic.

The sub +12V Power...

Re: Sharp LCD TV Blows Fuses LC-19SB24U

SOLVED!

It was indeed the Q7523 FET, which is part number (FQPF8N60C). I replaced it with a $10 replacement off eBay, and all is well. No more blowing the F7502 fuse and the monitor works as usual.

Thanks all!

Re: Sharp LCD TV Blows Fuses LC-19SB24U

Forgot to mention, I have checked the D7527 Bridge Rectifier to make sure the resistance is appropriate from anode to cathode of each diode, and all 4 pins looked good. This was done with the rectifier off the board.

Re: Sharp LCD TV Blows Fuses LC-19SB24U

Sorry to resurrect such an old thread. I am currently having the same issue with my LC-19SB24U. I have tested both F7501 (good) and F7502 (bad). So I replaced F7502 with a 2.5A 250V slow-blow fuse. Every time I connect the Power Supply Board to the wall, the F7502 fuse immediately blows. This happens with the Power Supply Board isolated from all other components (not connected to the main board or backlights).

I then checked the two large diodes (D7520 and D7526) for continuity from anode to cathode and they looked good. No...