Toshiba 46L5200 Logo Screen Flash - LCD TV REPAIR No Picture - LED Drive Problem Part 1
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- Опубликовано: 10 июл 2015
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This is part 1. Troubleshooting of Toshiba logo flash in 46L5200 LED/LCD TV. 
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I really enjoyed this video. The step by step troubleshooting is really nice. I would really love to see more main boards being troubleshooted like this one. I just had this symptom the other day but couldn't get repair approval on it.
Thank you, Norcal715, you ROCK. Thanks to this video, my Tosh 46L5200 was good as new in less than a week, died exactly like yours. SJimmy was out of stock, but to my delight Ebay had new led strips and BAM! Football is back!!
Another great vid. Brilliant diagnosis.
Always look forward to the next.
Thanks for this video. The walkthrough helped me repair our Toshiba. Cheers
That was very informative.Love your Vlogs.Looking forward to part 2.
Thank you
Excellent tutorial looking forward to a part 2.
well explained love the way you practically demonstrate everything great man.
I really enjoy watching your channel, troubleshooting to component level and not board swapping is far more rewarding and cost effective. How is the L.E.D. attached to the strip, is it soldered or bonded.
You did a very hard and skillfull job to get access to failure part, huh what a job!
Thanks for sharing your knowledge bud its truly appreciated
Great instructive video!
i love this and you make simply i just fixed a toshiba 58l7300u thank god it was the led driver board not the leds in the panel,but i still learned something
Thank you for the guide, you saved my tv!
I would have never gone into the tv so far because there is too much risk involved. Talking about reliability, the fluorescent ones were much more reliable at least to me than this modern junk TV's. Keep up the good work. Cheers :)
If someone is willing to pay it's worth the work.
There is a easier trick for know if you have a led strips problem:When you start a tv and you see the logo and after tv shutdown or backlight shutdown.Or if in a dark room you see a really fast flash in the screen(but you dont have time to see the logo).These 2 cases are almost all the time (98%) a led strips problem.Dont broke your head with taking measure :)But this video is really well done for explain how it s worked.Thanks to you for do it :)
I was looking at a Samsung florescent backlight lcd and took the lcd screen out and the diffusers. On the samsung the metal frame that holds the lcd down is screwed on. Well I put everything back together using a small 4volt drill screwdriver and 20 minutes later while the tv was sitting there I heard a "crack" I looked and the one corner of the lcd got messed up. I assumed that I must have put to much pressure on the lcd when I put the bracket back on. Have you ever encountered the same problem?
Great video! What were you grounding your negative lead to?
Hey Jimmy I have a Toshiba 52hl167. I'm experiencing the top half of the screen way dimmer than the bottom half. I assume this is the backlight inverter, however when I openned the back of the TV, I have 4 boards; two on each side of the screen. How do I know which side controls the top half of the screen and do I have to replace all the boards? Thanks!
very well made video, big help.
Thank you!
Hello there! i just wanna ask where i do wanna start fixing my tv, if i have back light when i turn it on but after a while i'll get blinking display TCL TV LED50D27000.
What order do the diffuser sheets go in? (Yes, I went there)
i have a toshiba backlight 42lx177 sound but no pic at all not even a flash on all inputs would that be the main board problem?
hi, i saw your video, thank you ! i have an issue with an brand new Toshiba 55ua4b63dg, the remote doesn't work. I put new batterrys, i press any button, the tv doesn't start. I tryed to paired the remote ( i press on source button just untill the blue led is flickerd, i wait to flickerd, and it stop flickerd...and nothing happent)...still cant use my remote. Is there a combination of numbers to make the remote work? Please help me !!!! Regards
Pulled a 60" Westinghouse (VR6025Z) from the county dump (I grab all tv's that have intact displays) Get it home, power it up, I get a "W" logo for about 1.5 seconds, then dark. flashlight shows me display still on, so my first thought was same, which I dreaded (have broken a display or two trying to remove) took back off and went to check inverter input voltages 1st. this 60" monolith had huge inverters, a Master, and 3 slaves. thats when I noticed a 14 pin jumper connecting slave 2 and slave 3 was burnt to a crisp, insulation on a couple of lead wires gone, in fact one wire was burnt so bad it was gone. Ok, maybe it's not an LED issue then... lolz
I had 24 volts going into these, so PS was good. I ESR'd the inverter board caps, all good, mosfets were good, all transformers rang good...drove me crazy, so I slept on it (I find it's good to ponder)It hit me next morning like a brick...Bad grounds, just like the Samsungs (common problem w/ those)
Even remember saying to meself when un-screwing the inverters off that these mount screws were loose as hell. I found another 14 pin jumper from my box O leads,cables and wires. then replaced these cheap screws with a better type that "bites" better.
Ta-Da, display stayed on!! I checked all screws on all boards, and yes every damn one of them were looser than a 2$ Ho ;)
the heating/cooling cycles over time had loosened them. I replaced all the screws and have a 60" in the living room now. I got 7$ invested in this thing (new ebay remote) and a few hours labor...not too shabby ;)
Thank you so much
can u do a video on tcl led tvs with the same issue Come on flash of tcl logo then powers off
how much would you or someone have charged to fix that problem and how long did it take to fix? great video by the way.
Thanks you very much !!!
Hello sir, can you help me with my LG tv. The problem was, the set can be switch on and off, no picture but audio is good, the backlight lights up. I changed the main board but the problem still persists. I suspected maybe the problem is the circuit connected directly to the panel. Is it normal that the voltage of the leds reads 92v and drops a bit in 86v steady?
Nice, hope you can find a replacement
I know this video is fairly old now but I have a similar problem except that it gets passed the initial boot, when I plug something in, whether RCA or HDMI it shows the image from the device for a moment then the screen goes black. Could this be a similar issue? anything helps I appreciate your time.
hello I have the same tv makes me a defect I do not know if and the same of the vostrop comes out the Toshiba Logo and it gets black you can not hear the voice and picture thanks
Hello, excellent friend, your diagnosis of failure of this toschiba model. I explain a flaw that I have of this same model. When you turn on the TV, it gives the logo Toshiba turns on the screen (led) but then turns off and does not give video. What types of components or TV zone can I review? regards
thanks for sharing
thanks very interesting
good video sir thankss
Tengo una toshiba que derepente se le va el sonido tengo que desconectarla y conectarla para volver es cuchar el donido, que ago para arreglar el problema
I have the exact same model. It does work for a while, then has the problem after a few minutes. Once it has the problem it happens quicker after you power cycle it. Possibly heat related LED problem? I measure 21.7v on all four back lights without video input. It seems to ramp up from 0, to 6, to 15, then to 21.7v. With PC video input it drops to 15.2v. All voltages are probably dependent on my back light level. When it goes out I see them all spike to 27v then to 0v. Vout measures 102v while normal, and 11v after it goes out. This TV just started doing this. Seven years use ain't bad compared to most other folks with just 2 years use after they bought it brand new. EDIT: I verified 3 back light lines all spike up to 28v, and only one does not when it happens. I swapped two pins and the non-spiking wire moved to the adjacent pad. So I suppose mine is not a driver board problem too.
Nice video sir
Are those "cree" led`s . What are you going to do to replace the bad one , or entire strip.
Hi good tutorial i have a question i have a seem tv i forget how the reflector sheets position can you help me if you can thank you
Why does 1 led shorted bring up the voltage and cause the tv to shut off? Did you have anything else that led you there? Most other tv repairs seem to end up a capacitor! You get the tough ones!!!!!
Thanks for the video
Ya, how annoying. Why can't these TVs be like the LED stop lights, where a huge cluster can die but yet the light keeps working. I swear it's planned obsolescence. The jig is up on bad capacitors, now they just switched to bad LEDs.
what if one had put the zener in the cable that attaches the strip (13:16)? btw thanks for the video.
have a Toshiba 50L3400U when turned on only displays toshiba logo and then the screen goes black
I have a Toshiba Regza 40XV645U. It has audio but no video. When flashlight is flashed on screen in a dark room there is a faint, but difficult to see picture. What could be the problem.
Hi Steve Norcal715 I have question I have model toshiba 46l5200u1 tv I have tested the power supply and get all the voltages but when I test the driver board at the vout I get 126 v but when I check the test points by the led return connecter I only get 2.5v on the first 3 test points is1,is2,is3 and get 5.2 on the is4 test point would you be able to tell me if it's a bad driver board or the LEDs like on your video.really nice educational videos really appreciate people like you that help out people Thank you
+albert jara
I have similar problem. Normal tv , then 0 voltage on the 4 s points. Did you get a answer?
The only way to know for sure is to test the LEDs
Please help me with the model toshiba 40L160EE.. I removed my pen drive from on tv and it is showing flash problem down on the screen and 1 time it showed toshiba and next time not
Mine just started doing this about a month ago and it’s frustrating... it stays on but there’s no image.. it flashes then the screen goes blank..
Hi, I have the 50L5200U toshiba LED TV and it turns on, everything is great for about 10-12 minutes, then the display turns off automaticlaly, about 30 seconds later the sound turns off. Any thing I can try, or how to fix? Happens everytime.
Was it worth all that work? If I have to pay to have the set fixed it will cost more than buying a new one.
I have a Toshiba 55L7200U that turns on for a minute with the banner and goes black screen with a green led at the bottom flashing.
Wow That's the kind of music i listen to when i repair tvs
Genius tech
I get the same flash without the logo on my Toshiba 50L350U. After that flashlight test works for about 4 seconds then goes totally black.
I have the same tv, but mine works for about an hour and then the backlight goes out. So I know it’s not an led that went bad. I’ve heard of similar models having an IC overheating. If it overheats, would replacing the heat sink work or would a thermal pad fix it, or do I need to replace the IC?
Update: I checked the voltages on the power board and led driver board. Power board looked good. Driver board was consistent, but each of the 4 contacts was at 22.3V.
Sounds like we have the same issue. Were you ever able to figure out the problem.?
The best
I have the same modeleverything work fine after 3 minutes the screen is blank with sound what should I do Thanks
I tested up to the point where you check the voltages for the LED on the driver, and mine were all the same. I thought that would steer away from the LED strips and to the driver. Replaced driver, same problem still. Any other suggestions? Would the LED strips be ok if those voltages are all about the same?
+Laura Kroger .. Also, when I have no picture input, the screen shows the "no signal" logo and stays on... but when picture input applied, then it flashes and loses picture, still has sound.
+Laura Kroger
Did you do flashlight test ie video present? Did you find an answer?
Nice
Have the same issue with Toshiba 55 inch tv I’ve swapped the main 3 boards in the tv but have the same issue it shows a perfect clean image for about 2/3 seconds then goes off ?
Get an "LED Backlight Tester" from eBay or Amazon and test the individual strings of backlights and see if any of them differ more than about 10% from the others.
www.amazon.com/TKDMR-Lamp-Bead-Backlight-Tester/dp/B082GVB68Y/ref=sr_1_1_sspa?keywords=led+backlight+tester&qid=1692080305&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1
Where did u grounded the Multimeter at 3:30 ?
metal chasis
Thanks
Hi NorCal715, Toshiba LED TV 40PB200 cannot power on, standby mode only, any idea? thanks
Look for a stuck/leaky tactile switch on the keypad. Is the IR receiver working correctly? Maybe corrupt EEPROM? Sorry thats all I can think of without having the set in front of me.
toshiba 40rv525u turn on no video signal when i push input button say not available
Valor del diodo zener?? Volts???
What? I thought LEDs were supposed to last forever!!!!
Ha, fat chance of that. Long live the good old reliable CCFL sets.
Better color too.
Lcd tv's are proven to last!
Led 47 inch - 120 watt
CCFL 47 inch 250 watt
@@zarirvtech
Well, what you save on your electric bill will cost you 5X in repairs for LED TVs.
It's just a bad design, either saving a few cents on manufacturing, or designed to fail from day one. They should have made these TVs to withstand multiple LED failures, like LED street lights. You'd be able to get many more years of life limping on 1 to 10 failures. But they'd rather you buy new hardware just because of a failed 50 cent part.
Great debug
Keen repair route he is looking not At what power supplyled voltage but rather at the what leds are droping Voltages if they act diffrently One string is bad how ever he shoilfnmake video on how we can determined how many string In Led tv and how they commected
HOW TO FIX LCD TV Logo Screen Flash ON LCD DRIVER No PictureREPLY ME PLEASE
Bro are you have firmware Toshiba 42CV500E? I need for my tv 😭
No, Sorry.
LED or Driver board
Is there a part 2?
No sorry that was several years ago.
How to unlock my Toshiba tv
can one bad led stop the whole tv from working ,
Yes it can
Its more easy if you have Backlight Tester that has current and voltage..
Shorted LED Will not cause shut off of backlight...maybe other opened one on the other side ..
Abderrazak Harakat Yes it did! It Caused current unbalance draw compared to the other 3 led circuits. see part 2 of video coming soon
+Abderrazak Harakat Of course it would, provided the load has raised high enough to the protection kick-in level. Most LED drivers are current drivers and have built-in protections for over-current and over-voltage. A diode shorting is actually a perfect failure since current driver is able to adjust to the lower resistance/high current by dropping out output voltage and thus lowering current again. But it can regulate/drop its output voltage only so much. When too much or too little current is required it just doesn't work.
+Coppell TV Repair LLC thank you for that. most TVs don't mind an led or two self.bypassing and the set just adjusts voltage accordingly.some brands just refuse to work with LEDs bypassed. this, I consider a design flaw, considering the work involved in getting access to the LEDs.
I have the same TV. After about 30 minutes my screen goes black but there is still sound. Does this mean I have a bad LED driver ?
Use a LED flashlight pressed up to the screen to see if you can see any video. If you do the the likely culprit is the LEDs, the drivers almost never fail.
@@norcal715 thank you for your help sir
I just use a wire to jump it
Look at all of your drawer cabinets; you sure never have to order parts!
Alot of work 🙄🙄🙄🙄
you mean my TV is toast because "one light out, they all go out??" holy shit. because this fix is not realistic. in fact you didn't ever really fix it.
She was your junk I've never had an LED die within five years now I got one
I meant to ToShiba TVs are junk