Westinghouse LD-5580Z No power

[erasmus9]

Hi everyone,

This is my first attempt at fixing a t.v., so bear with me. I have a 55" Westinghouse LED t.v. I got from my in-laws, and this thing is totally dead. I was told this started after an electrical storm one day. T.v. worked find beforehand, then absolutely nothing afterwards. No power, no lights on, no noises, nothing. Never having worked on a t.v. (repaired an xbox a few times and built my own pc, so I'm not totally useless) I don't have any sort of diagnostic routine to inspect it. I did go through what I know and checked the power supply itself with a multimeter, 19v coming through so it looks like that's good. Got the back of the t.v. to check for fuses and can't find any. So, where do I start?

Thanks,
Eric

[aaronwt6]

Re: Westinghouse LD-5580Z No power

Post a picture of the set with the back off. I'm guessing this is almost certainly going to be the ribbon cables though that light the LEDs. You should start but removing both from the main board then power it up and see if you can make out a faint image on the screen by shining a flashlight at it. Reference this thread:

https://www.badcaps.net/forum/showth...ouse+ld-4655vx

Post the pic though so I can verify that yours has the same setup.

[aaronwt6]

Re: Westinghouse LD-5580Z No power

It could of course be related to the power surge but lets try to rule that out. Also, once you've unhooked the ribbon cables see if you have 19V on the actual main board where the power supply plugs in.

[freakaftr8]

Re: Westinghouse LD-5580Z No power

Are you receiving standby voltage to mainboard? How about fuses on mainboard and tcon?

[aaronwt6]

Re: Westinghouse LD-5580Z No power

Are you receiving standby voltage to mainboard? How about fuses on mainboard and tcon?

Pretty sure this is going to be another 1 board deal like the 4655, 4255, 4680, ect. My guess. External 19V laptop style power supply.

[erasmus9]

Re: Westinghouse LD-5580Z No power

Not home yet to do any tests/pictures, but yes it did appear to be only one board when i opened it up last night to start exploring. I did not find any fuses that seem apparent. It is an external power supply, which I metered at 19v good as a first step. Figures it wouldn't be that easy.

[aaronwt6]

Re: Westinghouse LD-5580Z No power

Read through that other thread and start with the two ribbon cables. If the TV turns on with both unplugged, try each one at a time to see if the lights will work on 1/2 the screen. If you don't get any results with the ribbons unhooked, I'd suspect the main because what else is there? I've played with 3 of these Westinghouse TVs with this same design though. All three were ribbon cable shorts.

Oh, and very, very cheaply built.

[erasmus9]

Re: Westinghouse LD-5580Z No power

Ok I will give that a try tonight and respond. Thanks for the advice!

[freakaftr8]

Re: Westinghouse LD-5580Z No power

Pretty sure this is going to be another 1 board deal like the 4655, 4255, 4680, ect. My guess. External 19V laptop style power supply.

Ah yes, This seems to start being the standard in new LED tvs lately. Now they can be super duper thin!
Anyone wanna feel how nice and toasty the extenal supply is on my 27" Samsung syncmaster LED monitor?

[tom66]

Re: Westinghouse LD-5580Z No power

My 24" Samsung LED power supply hits about 70°C externally.

[freakaftr8]

Re: Westinghouse LD-5580Z No power

mine hits about 83.2 celsius.

As the op mentioned about his tv, if the LEDs spiked during the storm if the tv was on at the moment, that could certianly be a direct short or a major load on the ps.
Maybe ohm the LED strip connectors for dead shorts?

[erasmus9]

Re: Westinghouse LD-5580Z No power

Ribbon cable to led was it. I disconnected both and powered on and got the red led indicator, then connected right side only and got picture. Now to figure out how to get the other end out for replacement. It seems to be sandwiched between the screen and chassis and I'm a little nervous to try and desperate them...

[aaronwt6]

Re: Westinghouse LD-5580Z No power

Look through the other thread. There are detailed pictures. Its not real difficult. Just have some patience. More that likely it's going to be shorted where it wraps around the metal right near the plug on the front. I was able to repair two of the ones I had by simply unplugging the ribbon cable and placing a piece of tape under it to insulate from the metal. Then I notched the plastic piece the sandwiches it down to keep the pressure off. Last resort you can order a cable if the end is burnt but make that call once you dig in. The ribbon cables are expensive and not easy to come by.

[aaronwt6]

Re: Westinghouse LD-5580Z No power

It could also be the strip but I doubt it. Guessing the wire. I'd insulate / notch both sides while you have it all apart.

[erasmus9]

Re: Westinghouse LD-5580Z No power

OK so I may have screwed something up... I had power with just the right side disconnected, opened up the TV down to the shell and carefully taped around the aluminum where the ribbon was touching, reassembled, and now nothing. Doh! I had power before with either both or just the left side ribbon disconnected from the board and now no combination gives me anything. No light, no logo. Power supply is still reading 19v output. Maybe I reassembled something wrong?

[erasmus9]

Re: Westinghouse LD-5580Z No power

Edit: both sentences should be "left side", but I've tried all combinations of connected/not and no signs of life.

[tom66]

Re: Westinghouse LD-5580Z No power

Could be both have a problem, design is poor for both of them.

[erasmus9]

Re: Westinghouse LD-5580Z No power

Possible, but before I opened the tv all the way I was testing the ribbons. With both ribbons disconnected at the board end, I got the tv to power up with the red led indicator on. Then with the right side connected, it powered up again and I could see the logo and it went to tuner. Now, after taping the rail where the other end connected and reassembling, I can't get a power indicator even with both disconnected from the board. Is it possible I just didn't put something back right. The only iffy thing I noticed when reassembling were these plastic "circuitry" tabs on both sides, about 2" x 1/2" and 3 on each side evenly spaced. Not sure if they were folded under the lcd or not, as I didn't notice them until after everything was apart. Everything else was pretty much just plastic and screws. Not sure what else could've changed...

[tom66]

Re: Westinghouse LD-5580Z No power

Can we have a picture of the main board please?

[aaronwt6]

Re: Westinghouse LD-5580Z No power

Check the wire going from the main to the buttons / Infrared board. I pulled the end out of the small board on the bezel on one and drove myself nuts for an hour trying to figure out why it wouldn't turn on.