Toshiba 40l1333db TV Backlight Issue HELP!


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Toshiba 40l1333db TV Backlight Issue HELP!

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TVFIXER
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Oct 17, 2016, 9:33 PM

Post #1 of 17 (5758 views)
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Toshiba 40l1333db TV Backlight Issue HELP!	Can't Post

Hi Guys

I am writing because I have Toshiba 40l1333db TV however the back light will not work so the picture is black. When the TV Powers on the back light flashes for a second but then goes off and stays off. I opened the back up and replaced the power board with a used one I bought from eBay as I thought this was the issue. This actually did fix the problem and the TV was working fine for a week or so but now the same thing has happened again. Could someone possibly tell me what this means or how I can fix it please any help would be greatly appreciated.

jts1957
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Oct 17, 2016, 10:10 PM

Post #2 of 17 (5753 views)
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Re: [TVFIXER] Toshiba 40l1333db TV Backlight Issue HELP! [In reply to]	Can't Post

Reinstall the original board and see if it works fine for a week or so ... or immediately resumes the back light flashes for a second but then goes off.

IF sound continues to work once screen has gone dark, I bet you'll find one or more LEDs inside LCD Panel are bad. IF you can access customer controls I'll bet the back light intensity level is at or near Maximum.

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Location: Far, Far Away

(This post was edited by jts1957 on Oct 17, 2016, 10:12 PM)

TVFIXER
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Oct 20, 2016, 12:40 AM

Post #3 of 17 (5706 views)
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Re: [jts1957] Toshiba 40l1333db TV Backlight Issue HELP! [In reply to]	Can't Post

Hi

I dont have the original board to put back in I got rid of it as I thought it was broken. If it was the backlight/bulbs that were the problem then why would replacing the power board fix the issue for a week or so ? Is there anything I can do to fix this ?

Thanks for your reply by the way

jts1957
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Oct 20, 2016, 1:36 AM

Post #4 of 17 (5703 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Good thing you're not a mortician. Wink

Gremlins? The intricacies of uncertainties? Stray capacitance? (Some more ideas at link below)

Quote

Is there anything I can do to fix this ?

1) Replace the TV;
2) Replace the LED bulb(s) or strip(s); Test by optically proving that one or more LED(s) or strip(s) ARE defective.

http://badcaps.net/...php?searchid=7455819

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Location: Far, Far Away

TVFIXER
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Oct 20, 2016, 12:22 PM

Post #5 of 17 (5694 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Hi thanks for the reply

I'm not sure what you are talking about to be honest and I have seen gremlins.

The link you provided nothing seems to be coming up. I was afraid I was going to have to replace an led strip.

Thanks anyway

jts1957
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Oct 20, 2016, 12:36 PM

Post #6 of 17 (5692 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Quote

I was afraid I was going to have to replace an led strip.

Echo

Quote

2) Replace the LED bulb(s) or strip(s); Test by optically proving that one or more LED(s) or strip(s) ARE defective.

Quote

The link you provided nothing seems to be coming up.

Try these:
http://badcaps.net/...;highlight=40l1333db
http://badcaps.net/...;highlight=40l1333db

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Location: Far, Far Away

TVFIXER
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Oct 22, 2016, 5:59 PM

Post #7 of 17 (5659 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Hello again

I was wiggling the led board connector (that connects it to the power board) as it felt loose and suddenly heard something blow and a few sparks appeared. Does this mean I have damaged the led connector board or the led lights ?

In addition I have now disassembled the TV fully and have discovered that one of the led lights is blown. Will replacing the strip fix the problem ? I am worried I have damaged the connector board now also as the rest of the lights don't even flash when I switch it on anymore.

jts1957
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Oct 22, 2016, 7:32 PM

Post #8 of 17 (5655 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

A GOOD thorough visual inspection is ALWAYS step one.

https://www.google.com/...e=UTF-8&oe=UTF-8

Don't forget to inspect solder joints at the connectors. Wink

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Location: Far, Far Away

TVFIXER
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Oct 22, 2016, 11:32 PM

Post #9 of 17 (5651 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Yeah just checked them the solder joints at the bottom are wiggling a little. Will a drop of solder on each one fix this ? or will I have to desolder and resolder the joints ?

jts1957
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Oct 23, 2016, 1:13 AM

Post #10 of 17 (5647 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

I usually heat joint until molten and add 1/8" to 1/2" length of solder (depends on solder wire's diameter).

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Location: Far, Far Away

(This post was edited by jts1957 on Oct 23, 2016, 1:13 AM)

TVFIXER
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Oct 26, 2016, 7:39 PM

Post #11 of 17 (5578 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Hi turns out the board was broken. Ive repaired it now and discovered 6 lights are not wokring. Is there a way to replace each bulb without having to replace the whole strip ? As I would have to replace 3 strips.

TVFIXER
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Oct 26, 2016, 7:44 PM

Post #12 of 17 (5577 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

By the way I have replaced one of the strips and the backlight is working again now but will this be enough if there are 6 broken bulbs ? or will the tv just break again soon.

Thanks

jts1957
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Oct 26, 2016, 8:03 PM

Post #13 of 17 (5576 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Check and see if Toshiba runs their Backlight Intensity at 100%.

Strips are easiest way, but there are videos on Youtub regarding replacing single LED and or 'splicing' part of a strip.

IF 6 are gone - rest are sure to follow.

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Location: Far, Far Away

TVFIXER
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Oct 26, 2016, 8:11 PM

Post #14 of 17 (5574 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

how do I check if the backlight is running 100% ?

jts1957
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Oct 26, 2016, 8:49 PM

Post #15 of 17 (5569 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Looks like page 23 of the 'Manual.' Unimpressed

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TVFIXER
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Oct 26, 2016, 8:52 PM

Post #16 of 17 (5567 views)
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Re: [jts1957] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

I don't have a manual is there anyway to check the Back light intensity. When I switch it on you can barely tell there are any bulbs gone its quite bright.

jts1957
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Oct 26, 2016, 9:08 PM

Post #17 of 17 (5566 views)
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Re: [TVFIXER] Toshiba TV Backlight Issue HELP! [In reply to]	Can't Post

Google can be your friend:

http://www.toshiba-om.net/...English-Specific.pdf

More a question as to IF they have been running at full intensity since set was born.

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Location: Far, Far Away

(This post was edited by jts1957 on Oct 26, 2016, 9:09 PM)

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