TV repair (LG 37SL80YD) possible?


#1

A family members LG TV recently stopped working. It was used pretty much every day for the last 8 years, probably for several hours.

I have had a look at it, and it powers on with the control lights below the LCD lighting up. Though there is no display.

After about 30s I have a few lines/pixels vertically of colour (no sound) slowly moving from roughly the centre towards the right of the display, maybe 30cm in width.

Anyone who has tinkered with LCDs/TVs recently (I have not for a few years) have a thought on what it might be, and if it is repairable?

Would be handy to have around if I can get it working again (rather than another piece of e-waste).


#2

Without having a service manual in my possession - if it were I, the first thing I would do is pull the board out and go over it with a magnifying glass or microscope camera checking for dry/dodgy solder joints and reflowing any that looked even remotely questionable.

I’d then reflow any BGA packages to resolve any underfill issues.


#3

any recommendations for either of these? Thanks!


#4

I’m not sure there’s much differentiation between magnifying glass models, to be honest.


#5

You could do worse than one of these things for fine work, especially since you’re probably not wanting to spend too much on tools for this one job. https://www.jaycar.com.au/led-headband-magnifier/p/QM3511


#6

I finally found some time to disassemble to TV. I cleaned out the dust and inspected all of the capacitors on the power board and (two) inverter boards. I can’t see any blown/bulging ones.

Next step (including another look at the capacitors) is

  1. Use a multimeter to test the capacitors (any recommendations as the off multimeter is awol?)

then possibly

  1. reflow the BGA packages as per @FaultyTaco’s suggestion (will also need a new heat gun).

If there are capacitors to replace, I can get this kit https://www.ebay.com/itm/LCD-Monitor-Capacitor-Repair-Kit-for-LG-37SL80YD-LCD-TV-with-solder-desolder-OZ-/271781179802 or just buy individual ones (can’t see the uF on most of them)?


#7

For anyone interested. I replaced all capacitors supplied with the kit linked to above.

The TV is back up and running and all looks good. Saved a lot of plastic and e-waste from going to landfill.

Overall, $15 for capacitors (already had a mini soldering iron and associated gear) and a fair few hours tinkering kept this out of landfill.


[I did pick up a multimeter as well (though it only reads up to 100 micro Farads, whereas most of the capacitors were larger than this), which has already been handy for other things.]