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LG Xtremo LM-M1040, and over the last few months, when listening to music, the system turns it self off. To rectify I have to disconnect the powert from the wall socket for a number of seconds then plug it back in again, and it works. Now it will not turn back on.

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  • olbaldy Sep 06, 2008

    Have the same unit with the same problem. Found that running the unit without the right hand (when facing it) side panel, it will run continuously (12 hours). Adding extra heat did not bring the problem on. Re-soldered the power supply board with no joy. Replaced the power supply PTC fuse for good measure (TH901) as this can eventually fail.

  • Anonymous Apr 04, 2009

    I have the LG LM M1040 stereo system and it has the same problem, I just recently opened it up and replaced the stock fan with a larger 12cm PC fan that runs on 12v (the same as the stock fan) and nothing happens the doesn't spin or anything, I have tested the fan separately and it still works, is it possible that the fan isn't getting any power if not, where is a place where I can solder on some extra wires and power the fan?



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I suspect that this is a design problem guys. The fan in this unit is fine, it only turns on when volume is turned up high & fan speed varies with volume.
The problem I think is the STRX6759 on power board. The aluminium heatsink is too small to dissipate enough of the heat from the device. You will burn yourself touching it!!
The STRX6759, whilst I can't find the datasheet on the component it looks to be a voltage regulator with a thermal cut out. When it gets too hot (probably after an hour) it cuts itself off to protect itself until it has cooled enough. Then you need to turn unit off & then on again to reset.

I am modifying a friends unit with bigger heatsink but damaged a coil. If anyone can kindly supply me with coil. Part Number: LF902 please contact me: ian873 (at) (in Sydney, Australia)

Posted on Apr 04, 2010

  • ian873 Jan 23, 2014

    As a follow-up. Managed to replace the coil. However in relation to the above problem I can report that I made a large heatsink from sheet steel which I bolted onto the existing (but too small) heatsink to the regulator. This fixed the problem. The extra surface area of the added heatsink resulted in more heat disipated, more rapidly per unit of time. In a nut-shell, no more thermal power-cut off. Problem solved :-)



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