The backlight flashes very quickly on power up but that's it. Can see the menu with light. This unit doesn't have an inverter board so is it the main power board? Or could it all flash quickly because the feedback/return wires are indicating a faulty led and is turning off?
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Toshiba 50L4300U Backlight
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Re: Toshiba 50L4300U Backlight
Numerous ways to repair depending on how you want to do it. You can replace strips. Buy a strip and cut it up for stacking or buy just leds and replace. Those are on order of time and skill level. There are youtube videos on each.I assume no responsibility for any stupid suggestions I might post.
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Re: Toshiba 50L4300U Backlight
It will be less costly to apply Reecey's Stack Method, which is a proven fix. If it is more than 2 LEDs, I will recommend a new strip replacement. After repairing the backlights turn down the Backlights Level control to about 75% and that should prevent further issues.
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Re: Toshiba 50L4300U Backlight
The way the chassis looks, it does not look like edge lit panel.
LC500DUE-SFR1
http://www.shopjimmy.com/lg-6916l-12...strip-only.htm
http://www.shopjimmy.com/lg-lc500due...-12-strips.htm
You may want to verify.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Toshiba 50L4300U Backlight
Defo not edge lit, normal vestal back light strip LED's,
like i said, check each LED first,
6 rows of LED's = 12 strips in total,
12 plastic connection blocks, loads of soldering,Last edited by finntricky; 03-30-2017, 01:21 AM.
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Re: Toshiba 50L4300U Backlight
My bad, this review here has it as edge lit.
https://reviews.lcdtvbuyingguide.com...-50l4300u.html
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Re: Toshiba 50L4300U Backlight
So the first leg which is the top two sets and the bottom set all appear good.
The second leg however is bad. I tested as individual strips.
L1: All good > R1: 1 bad LED
L2: all bad > R2: All good
L2: had 2 bad LEDs > R2: 1 bad LED
Is that many bad LEDs common? Should I just get a set of strips? Should I replace all of them if others are soon to follow? (Why only the second leg? Power board surge or something?)
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Re: Toshiba 50L4300U Backlight
Originally posted by Eyes.Only View PostSo the first leg which is the top two sets and the bottom set all appear good.
The second leg however is bad. I tested as individual strips.
L1: All good > R1: 1 bad LED
L2: all bad > R2: All good
L2: had 2 bad LEDs > R2: 1 bad LED
Is that many bad LEDs common? Should I just get a set of strips? Should I replace all of them if others are soon to follow? (Why only the second leg? Power board surge or something?)
So ONLY two bad LEDS? that is nothing. It is a big panel so it kind of taking chance that other LEDS may go out later on too, you can replace them all of just the bad ones and run the backlights level as low as you can to extend the life of the LEDs.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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