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LG 50LF580V - Flashing backlights.

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Turnip:
Hi folks,

Have one with a continual backlight flash. Note OSG info but haven't the time to read it before display cuts. Seems 5 strips connected 2 and 3 strips in series to two P/I feeds.

Checked screen with tester where one shows 90v and the other 144v so suspect a couple of duff Leds on the 90v side as the figures don't add up.

Thought mention as Guess someone has had the problem before, and the screen is a bit big and fragile to take off for fun.

Any thoughts ? - Chris

downunder:

Hi Chris,

I'd be more inclined to suspect the LEDs on the 144V feed, however, the LED strips in these have a joiner near the centre of each dtrip. These are inclined to be problematic. Just a thought, but I can see a display panel coming off.


Bruce

Turnip:
Hi Bruce,

Do you care for a bet as to which string has the duff budgies ?

Waiting for the cust to sign the 'shit or bust' certificate, as they can get peeved even after a verbal OK if things go wrong and I catch an edge against something I didn't notice.

After some early disasters, sorted a large sheet of plywood that I shove underneath. It even has a lip so the screen can't drop off while I'm looking for somewhere to rest it whilst sorting the diodes - Chris.

sinclairtv:
If its got the 6v LEDs, Im finding that some types are brighter when replaced and will shine through. Pain in the neck when the set has to be boxed back up to discover this. I use the old cardboard of a large set to rest the screen on along with a sucker to lift a corner on to the cardboard

Turnip:
Thanks Sinclair,

Had an issue with a top lit screen, where replaced dodgy leds (rather than the whole lot) where cust complained as the heat had distorted the diffuser sheets giving a vague wedge pattern down the first two inches on certain pictures.

Suspect if I'd replaced the sheets the other way up - Guess learning curve.

Had one in today with a smashed screen where the edge lit Led assembly was mounted LHS - Seems sensible but didn't survive the brick.

Tend to use a bit of plywood, though with 60 inch sets, I'm in trouble as ply sorts 50 inch. Early failures were due to catching the screen on something, and chipping off a corner - Mind you, that was last year, not lost one since - Chris.

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