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We have a LG 32LN5310-UB TV which the screen has gone black. There is sound and if you shine a flashlight on the screen you can see images. Is this economically repairable?

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  • LG Master
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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Jan 02, 2017

Testimonial: "OK, there is no back light inverter on this TV so now to try to narrow it down to the power supply or main board.................. Thanks for the push in the right direction......"

  • William Fyfe
    William Fyfe Jan 02, 2017

    Found more info, power supply, thanks bunches for the guidance!

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Posted on Jan 02, 2017

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You have lost your backlights and this is very common for the LN series LG TVs...they use 6 volt lamps and if one opens the entire string goes out, kind of like the old Christmas lights used to be. First thing to check though if your able is the voltage on both sets of cables, hook your meter to one side of the power board that supplies the lamps and see if you have voltage for a second or 2 when you power the set up and then it drops off to almost nothing, if you see this unhook the plug that goes to the lamps in the panel and see if the voltage holds at a couple hundred volts, if it does its lamps in the panel and I think you will find this is the case, if it happens the voltage drops down or isn't any to start with its the power board...Good luck

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TV was playing, then the screen turned black.


If the screen is black and you have sound then lightly press and shine a strong flashlight against the screen. If you see an image around the edge of the flashlight, an image is being 'displayed'. The problem is probably in the Inverter/CCFT or the power going to the Inverter.

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