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Old 08-30-2012, 09:12 AM   #1
tibimakai
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Default Sharp LC-40LE810UN question

I have picked up last night this TV which seems completely dead, no LED light at all.
The TV has some metal parts rusted and the back cover has a lot of white mess on it. By the way the back it's metal(!).
This TV is an LED thin TV.
I had very little time to look at it, I have just checked a couple of components, like fuses, rectifier, main capacitors and such. They all seem fine.
I have found a component which I can't identify, it looks like a glass fuse, but I'm not sure, I can't get continuity on it.
What do you think, what is it?
This picture is from shopjimmy, it's not mine.
Later today I will take some pictures.
I have a feeling that it's a water damaged TV.
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Old 08-30-2012, 01:00 PM   #2
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Default Re: Sharp LC-40LE810UN question

It's going to the chassy ground through that gold circle capacitor.
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Old 08-30-2012, 01:02 PM   #3
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Default Re: Sharp LC-40LE810UN question

Surge suppressor, spark gap type. Very nice, those are expensive parts, good to see that Sharp/Delta include one.
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Old 08-30-2012, 01:13 PM   #4
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Default Re: Sharp LC-40LE810UN question

Thank you.
How can I check it out if it's good or not?
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Old 08-30-2012, 01:14 PM   #5
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Default Re: Sharp LC-40LE810UN question

It will almost never fail. If it does, it will have exploded.

Check all fuses that you can see & check for approx 165V across the large caps on the right hand side of the power board.
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Old 08-30-2012, 01:50 PM   #6
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Default Re: Sharp LC-40LE810UN question

Any sign of corrosion on the backside of the board? You should have continuity from each one of the fuse to each one of the bridge with the '~' on it (one fuse will go to the ~, and another fuse will go to another ~ if one fuse is for HOT, and another fuse for Neutral ). Is there a main power switch somewhere since I do not see relay on the board.
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Old 08-30-2012, 02:01 PM   #7
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Default Re: Sharp LC-40LE810UN question

It's only a sensor style switch. The rest I will have to check when I'm actually in front of the TV. I'm "working" now.
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Old 08-30-2012, 02:56 PM   #8
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Default Re: Sharp LC-40LE810UN question

I am "working" now also!
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Old 08-30-2012, 03:00 PM   #9
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Default Re: Sharp LC-40LE810UN question

This type of PS should have 165V/398V-when on?
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Old 08-30-2012, 03:03 PM   #10
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Default Re: Sharp LC-40LE810UN question

Are the two large caps laying on their sides rated at 450VDC, if it is, this set has PFC circuit, there is a large transformer on the top right of the board, that may be the PFC choke.
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Old 08-30-2012, 03:16 PM   #11
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Default Re: Sharp LC-40LE810UN question

Yes, they are rated at 450V.
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Old 08-30-2012, 03:18 PM   #12
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Default Re: Sharp LC-40LE810UN question

Then yes, they should have around 400V on them when TV is on. The TV without PFC in the US will use 250~350V cap since they are cheaper.
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Old 08-30-2012, 03:18 PM   #13
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Default Re: Sharp LC-40LE810UN question

And how many voltages do you get across them?
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Old 08-30-2012, 05:47 PM   #14
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Default Re: Sharp LC-40LE810UN question

Right now nothing, the board it's on my night stand and the TV it's in the garage. I just had a late lunch.
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Old 08-30-2012, 11:39 PM   #15
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Default Re: Sharp LC-40LE810UN question

I had a couple minutes and I have measured the voltage across the two capacitors and there is a 161.5V. On the PD connector all pins measure 0V.
Tomorrow I will take some pictures with my board.
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Old 08-31-2012, 12:09 AM   #16
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Default Re: Sharp LC-40LE810UN question

OK, this is good, the problem is probably on the PSU. Check for 5VSTBY.
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Old 08-31-2012, 12:25 AM   #17
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Default Re: Sharp LC-40LE810UN question

I will, but since none of the LEDs is turning on, then I assume that there is no 5V.
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Old 08-31-2012, 12:28 AM   #18
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Default Re: Sharp LC-40LE810UN question

Bad assumption. I've had a Toshiba TV with a perfectly functional power supply, but it was still dead (no LED, no sign of life at all) - it turned out to be a failed 2.5V regulator on the video board.
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Old 08-31-2012, 12:36 AM   #19
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Default Re: Sharp LC-40LE810UN question

My bad.
Which one do you think it is? The LB-8 STB?
I haven't had time to measure the LB connector, but on the PD there is no voltage present on any of the pins.
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Old 08-31-2012, 12:41 AM   #20
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Default Re: Sharp LC-40LE810UN question

You need to check all pins for any voltage. It looks like this TV doesn't use a standby supply, just one main supply. So, if the main supply is dead, you need to look there for the fault.
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