sharp 50" wont turn on. blue led lit

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Kevin R. @unique321

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Posted: Jun 22, 2019

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sharp 50" wont turn on. blue led lit

Sharp 50" LED ROKU Tv Will not power on, blue standby LED on.

Sharp 50’ LED HDTV 1080 ROKU

M: LC-50LBU591U Rev A.

Was Watching Tv —> Flickering—> Black Screen.

So lets get this outta the way.

TV —> was moved to another Outlet. standby LED lit, remote & tv button will not power on device.

After Power cycle—> tv has blue stand by light, will not power up with remote or button on tv.

After Hard Rest—> tv was unplugged off for 24 hrs. same result as above.

Factory Reset- reset button held for 15 seconds, LED Dims, blinks 2 twice then turns off.

LED DOES NOT come back on till, the reset button is pressed again.

Unplugged TV —> held TV button down for 20 sec. —>removed batteries from remote. every button was pressed twice. plugged tv back in. batteries back in to remote, same results.

TV Ive had for over 1 yr.. ISN’T Cover by warranty.

TV Back panel removed. nothing is leaking, no blown capacitors. all boards look fine visually. nothing is burnt.

Sharp Support website- I Cant find any useful info on their website.

sharp phone support - transferred me to their “Geek Squad” haha, its actually a local best buy.

There you have it. I cant find any documents for troubleshooting. No tech/Service manuals. nothing on what pins to check with a voltmeter…

any and all Support/Advice is welcome!!

please read what I’ve already tried, NOTHING hasn’t worked up to this point. Im looking for useful new info i haven’t tired…

Thank you for all ur help in advance !!!

Answer this question I have this problem too

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Interesting that your tv and mine (exact model) started doing this at the exact same time. I'm thinking its more firmware related than a hardware issue.

Jun 24, 2019 by Shawn

@prindlecat Mine did the same, during roughly the same timeframe. I am with you, it must be software. That being said, there's a new update out now and it fixed my TV. I've been playing shows for 3 hours solid now, no turning off..

Before it'd turn off constantly

Jul 30, 2019 by Ryan Park

Mine is doing the exact same thing. 1.5 years after purchase.

Nov 11, 2019 by Beentheredonethat

Seems I am experiencing the same issue. I had this tv same 1.5 years about. It went in standby mode and it's stuck. All I'm getting is blue light. I turned it off for hours, removed batteries from control, disconnected all cables (I had it connected as second screen for my laptop) and nothing. When I plug in I get red light for a couple of secs and back into blue light...not sure what else I can do. Before it would work after disconnecting a few times.

Jun 2, 2020 by marzena.chojnacka

Mine is doing the same thing! Bought 11/17/18! Very disappointing to have this $400+ TV crash less than 3 years after purchase!!

Sep 25, 2021 by pagel.kelli

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5 Answers

Interesting that your tv and mine (exact model) started doing this at the exact same time. I'm thinking its more firmware related than a hardware issue. — Shawn
@prindlecat Mine did the same, during roughly the same timeframe. I am with you, it must be software. That being said, there's a new update out now and it fixed my TV. I've been playing shows for 3 hours solid now, no turning off..

Before it'd turn off constantly — Ryan Park
Mine is doing the exact same thing. 1.5 years after purchase. — Beentheredonethat
Seems I am experiencing the same issue. I had this tv same 1.5 years about. It went in standby mode and it's stuck. All I'm getting is blue light. I turned it off for hours, removed batteries from control, disconnected all cables (I had it connected as second screen for my laptop) and nothing. When I plug in I get red light for a couple of secs and back into blue light...not sure what else I can do. Before it would work after disconnecting a few times. — marzena.chojnacka
Mine is doing the same thing! Bought 11/17/18! Very disappointing to have this $400+ TV crash less than 3 years after purchase!! — pagel.kelli

oldturkey03 @oldturkey03 Rep: 789.6k 1.1k 897 2.4k · Answer 1 · 2019-06-22T19:11:38-07:00

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oldturkey03 @oldturkey03

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Posted: Jun 22, 2019

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@unique321 sounds like an issue with the power board. You do want to go ahead and post some good pictures of your boards as well as the interconnect cables etc.with your question. Adding images to an existing question

Next you want to measure the output from the power board to the main board. For the voltages check the values that are silk screened onto the board. Let us know what you find.

check the fuse to ensure that your board gets power and if so check the voltages on the connector against the value printed on the board

and if you need it here is the schematic for your power board. Let us know if you need help with that. Power-Supply-Hisense-RSAG7.820.pdf

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I’ll have those pix 's up later today. I’ll take a closer look at and test at the power board. I very much appreciate your help.

Jun 23, 2019 by Kevin R.

As Requested, Pix added.

Jun 23, 2019 by Kevin R.

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Ryan Park @ryanpark Rep: 13 1 · Answer 2 · 2019-07-30T16:19:27-07:00

Issue happened to me too at the same time on the same TV… I’m questioning if it’s a hardware item that wears out, or if it was a software issue..

@unique321 IT’S FIXED!!!

There was two potential solutions, I do not know which one fixed the TV, but it’s definitely working again.

Firstly, I had the TV unplugged for about a week, this made no difference, but I think it’s important to be clear about the state of the TV when I repaired it.

I plugged the TV in today and factory reset it. I then was able to connect a wired ethernet cable to the TV and connect to the Internet. I quickly jumped into Settings and was about to check for a software update when I noticed a strange prompt in the bottom left-hand side of the TV asking if I wanted to reduce power or power down the TV, the choices were “Yes” and “Never ask again”, I decided out of caution to select “Never ask again”. I have never seen this prompt before, but since it was related to the power state of the TV, I had to mention it..

As soon as I checked for a software update I received one! Update is 9.1.0 Build 4121-38, the previous firmware on this TV was 9.0.0 Build 4151-38; so a decent incremental update occured after I connected to the Internet!

After performing these two steps, I have now been streaming Netflix in 4K for over 1 hour, something that was nigh possible before!

I hope this helps others!

PS: My set is a LC-50LBU591C which is the Canadian model

Dealing with this problem right now, except I can't reset the TV. I hold the button and nothing happens. Black screen, constant blue LED. How did you factory reset it? — Mike Carter
Mine has blue LED light at bottom but will not power on and don't know if this TV has a reset button I've tried hold the power button for like 10 and 15 seconds nothing changed anybody know what my problem could be — Joshua Thompson
How do you update your tv if you can’t your tv to have a display?? The screen is just all black. The blue LED is lit, but nothing but black display... — Tj metcalfe

Brad Forster @bradforster Rep: 13 1 · Answer 3 · 2020-06-08T15:18:02-07:00

Brad Forster @bradforster

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Posted: Jun 8, 2020

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I'm not sure if it'll help but I found this on youtube a little while ago. https://youtu.be/Z1DEkSguWtg It shows him testing each wire with a multimeter to try and diagnose the issue. I just was given a broken tv the other day so I just started looking into it, but hopefully that video can provide someone with some useful information. I also stumbled upon https://www.shopjimmy.com which doesn't appear to be a scam so might be a good place to buy replacement parts.

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