LG 42LB550V TV - No power - Board repair

[@bgkid9]

This is one of the first comments I've written in years. I just had to show respect to the one and only. This man's a god

[@AlvaroGomes]

Sorin repairs become simple the practice of many years is in sight. The difficulty is that still studying its mathematics electronically the passive components, semiconductors and many and many discouragements.

[@krzysztofbednarek9485]

instead of fuse, I put in a 100w 240v bulb, and start repairing the inverter . when the bulb is lit, there is a short circuit on the first inverter.

[@NarasimhaB]

can you explain it a bit? i believe this tip would be help me in my diagnosis procedures immensely. thanks!

[@pawelnowak9400]

@@NarasimhaB bulb got to be in series on power cable, or just solder cables instead of fuse. It must be translucent bulb.

[@pawelnowak9400]

@@NarasimhaB I found this for you. kzbin.info/www/bejne/rYOpg6qFo7GmkKs

[@NarasimhaB]

@@pawelnowak9400 haha. thank you. so the logic is fairly simple, if the test device is short circuited, the circuit is closed and the bulb glows and acts an absorber of all that inrush high ampere current and prevents the test circuit from further damage?

[@krzysztofbednarek9485]

Pawel Nowak www.giangrandi.ch/electronics/smpsfix/smpsfix.shtml. Tu jest wyjaśnione , żarówkę daje jak wiem ze jest pewne zwarcie i zmiana bezpieczników kończy sie spaleniem ,

[@tyrian869]

Hey man, thank you so much. You have given me guidance on how to fix my friend's TV, I will be looking to do this here in the next day or so

[@REDDOGLewiston61]

ITS WORKING ! ... You got to love it!

[@juanchizabaleta2405]

Thank you teacher for your practical and efficient tips, giving classes, greetings from your disciple from South America.

[@evananderson8452]

Germanium Transistors; . . . the 1960s Thermistors as well You are great at what you do

[@Hans-yr3vd]

This exactly why i love watching youre video's, greetinx from the Netherlands / Holland / Nederland.

[@Oak690]

Boost FET shorted. Saw that many times in power supplies. Good it didn't short gate to drain. When that happens it usually kills the control IC. Nice work!

[@Vo0d0o2009]

the best thing ive learned on electronics and its beautifull its the absolute maximum rating law ,, when salvaging parts , we can ALWAYS use More higher rated parts than removed ones

[@paul-c7541]

I like the way you run off Sorin, & leave your friend to get a close up of the possible big flash & bang, ha ha, I must try that one in the workshop

[@wisher21uk]

If you don’t know please take note “ do not touch the large reservoir caps they can be charged upto 400 v or more it’s enough to stop your heart and can be fatal” and be careful when feeling around the back of the board too I have had a shock of a board that I had in a box for about a month or more As for the fuse if you use a piece of wire like that if it blows the skid mark it leaves will have metals in it and can cause more damage

[@orange11squares]

yea, that guy when he showed us the tv working, he was dangerously close to the tv boards almost touching the live voltage.

[@DumahBrazorf]

"If it's blowing we will see together. Nothing else would happen" Puts the board back and runs away before the collegue powers it.

[@robertcartier5088]

That's how we grey-haired fellows survive this long! I'm new to the channel, does he change colleges often? ;-]

[@allthingsTechrelated]

Dumah Brazorf when you are afraid to plug in your own job it’s remarkable.

[@gguillo2]

That was so awesome and funny!

[@christian56311]

"What I will do, I will do nothing" Epic!

[@christopherj3367]

always a pleasure watching, thanks for sharing. thought it was funny you finding the other PSU of the same type and with all the mosfets missing.

[@ErpetariumDotCom]

I love your videos. I love you guy! You 've got it so much on videos, you could make a weekly tv show on electronics too!

[@computersrepaircotesaint-l7407]

remind me the good old days when all we needed is brain and soldering iron.

[@samulosamulo1259]

Well done,with some luck,😀.Many times its driver allso bad.I put 60w bulb on fuse place when I check .Good job.Greeting from serbia

[@unlimitedsystem6525]

thanks sir...learn on internet,especially on yutube,like this channel make me became profesional engineer...learn,practice,pactice learn..,..sharing of our knowledge,,,..im an electrical engineer student...thats means its my pleasure....

[@ZZZ-z9n3n]

rossman swear jessa smile sorin run

[@lucky4809]

Hello sorin i have already watched all your tutorials and everytime you have new one i always watched them aind i really appreciate them, one thing i notice is i havent seen that you are using solder sucker to remove components to test them if they are short, like that one you just cut the pin if rectifier bridge, i suggest that you use solder sucker on your some next tutorials, thank you very much and have a nice day

[@fractal_logic]

Multumesc mult pentru ce ne invatati. Thank you.

[@kriswillems5661]

5A , 0.07V = 0.35W on a huge mosfet, so it's not hot. Usually the MOSFETs break because of a bad electrolytic caps.

[@cedomirgajic5680]

Sorin, I like your videos, and I learn a lot from them. I also like your shortcuts and brute force methods, and that haters is just there for pisses you off. Ignore them. One question, that psu is fixed by replacing shorted mosfet. But in many cases shorted mosfet also blow PWM controller. How we can diagnose damaged pwm controller that drive switching MOSFET. One person tell me but I never tried to test that method. Method is this. We take some PSU for repair, remove shorted mosfet and come to Vcc and ground of PWM controller with regulated power supply (check in datasheet of pwm ic which one pin is Vcc and which one is ground and what voltage need to be). Then with osciloscope test the output of pwm ic. And if we see pulses on osciloscope we know that pwm ic is good. What you think of that method, and is there something different easier method? Best regards

[@hugoboss7600]

Ur method is ok , dont listen to the idiot glyn hodges to feed output of the controller!!! u need to test the output not too feed it!!!

[@gio0042]

Is there any method without oscilloscope? Also which outputs should i test

[@ElektroTechNL]

Nice fix mr sorin. Like always.

[@wintechlazatin9772]

Sir are you ready repair lg 43" led tv?

[@andyturner1727]

Thanks Sorin , I like the way you run when colleague plug in .haha :-)

[@Max-Technikchannel]

hahaha I got today a switching power supply for repair there was the security through and a mosfet broken then I come online and see the video very nice: DDD

[@Droningonuk]

Hi sorin could you please run some current through one of your "special fuses" so we can see where and how it blows thank you

[@paulschaffer1281]

I have an LG 55UM6910PUC it just shows a blue/Green screen. When it first happened there was audio and you could switch channels but no picture. Now there is no audio so I can't tell if the channels are changing with the Remote. When it first starts you hear the startup sound but the screen just goes to blue/green.

[@bolon8200]

Good work great video Sorin love it thank you.

[@Franksxs]

I already Miss you! greetings from México.

[@MrRvdbeek]

No scoop needed this time only for reading Nice to see where the current is going to. And the components are big Thank you for the nice fuse replacement 🥴😂😂

[@cjdelphi]

To be honest most repairs don't need a scope

[@adriand4288]

This tv may come back again. No new thermal paste and weaker mosfet. Please let us know if it returns. Good luck and greetings!

[@WeFixTvs]

believe me never come back with this problem

[@orange11squares]

yep thermal paste is important, he repair things in a highly dodgy way some time.

[@comsoft]

Why cutting a track and the rectifier pin? Why you getting out the rectifier out and testing it using diode mode and doing the same to the mosfet?

[@StoesA]

Good video, but i would use a bigger soldering iron especially for desoldering the heatsink. Dont just cut traces, desolder the component, it doesnt look good brgds

[@electronic7979]

Helpful video 👍

[@korun99]

sorin pls make videos how psu and mainboard of tvs work and how to find failures.pls.you make so much for cellphones and laptop,but tvs are not so much.im sure sooo much will thankfull to you

[@drssound5273]

Good job Good luck 🙏🙏🙏🙏🙏

[@oswaldfraser4946]

Thanks very informative hope you can keep it up.

[@PHONE-LAPTOP-REPAIR]

i love this kind of repair..it is funny to me ahahah you know his country is rich but the approach is just like in my country which i hardly get spares..wow thanks sorin for this nice smart funny tutorial i love this kind of repair....

[@arsenico78]

I do the same thing. I don't like the sparks so i ask someone else to plug in the connector everytime! hahahahah

[@karlosp02]

Hello from Croatia, what do u do when there is no datasheet for the mosfet?? Is there any other solution? Can u teach more about driver for mosfet, you were telling about the waveform. Thank U , u are helping so much :)

[@bolon8200]

google MOSFETs then tap images you might find it there and the datasheet.

[@Waasil]

Thank you very much for the good video.

[@gerhardpetersen]

Hmm, so a 600V part blows but a 500V part is good to replace it with? I would have ordered the correct part even if the customer had to survive without TV for a few days more.

[@gerhardpetersen]

@glyn hodges I totally get that, and I grew up in the countryside where we had to jury rig many things to keep going. But I no longer use a stocking to replace a fan belt - I use the second car to go and buy a new belt......

[@giorgostexnikos6976]

nice doggy work by profesor sorin.enother lesson from profesor thenks for that lesson.

[@dimitarnikolov3527]

You know! The fuse is like the car tank, there is always more! HaHA

[@nilocosmeph6082]

thanks for the video sir

[@jemsncrystals]

My lg tv does not powers on. When i flick the wall socket switch ON, the standby Red light comes on goes off comes on goes off and then keeps off. And the television doesn't respond to remote or tv buttons. What could be wrong?

[@davidbolha]

Hi, What about when you have a LCD TFT monitor screen whose backlight turns on for about 2-3 s then it shuts off ? 🤔😞 How do you fix that ? The image is seen on the LCD if I shine on it with my pocket LED flashlight. I replaced a couple of electrolytic capacitors that were bulged or leaked. What to check next ? 😖 I do have the standby voltage (5,5 V) on the connector (that leads to the logic board) as well as 3,4 V. All 4 CCFL bulbs are fine. Thanks ! Best Regards,

[@badeadrian]

You need to check the Integrated circuit led driver...

[@davidbolha]

@@badeadrian Yeah after some investigation I found that the OZ9938GN chip was dead & in fact 2 CCFL tubes were dying. 😶😑😕 Still successfully sold the monitor recently for about 20 €... 😇🤗😄

[@yehtut3209]

many thanks, sir .

[@Robert-xi9sl]

How u check mosfet in multimeter or u check in power supplies

[@dz34]

Come to you my brother from Algeria

[@SajjadAli-lr2nh]

Do u know his shop address?

[@dz34]

@@SajjadAli-lr2nh no brother

[@SajjadAli-lr2nh]

@@dz34 ok THANKS brother 😊

[@karelzomer7763]

this was very usefull . thanks for showing.

[@mattdennison201]

Surely i wasn't the only person who was secretly hoping it would blow up.... purely for learning... haha :)

[@ftretassefa4541]

mr. sorin use light bulb trick to check weathr the fuse is blowing or not

[@user.fedorman]

Sorin your partner is safe!, not blowing mosfet hahaa

[@minnesota-boston9620]

Good job.

[@cotto887]

on the same bored the mosfet that was next the shorted mosfet why did'nt you use that one?

[@jadnsofia]

Hey, nice shorts !!!!

[@Todestelzer]

Tried to repair a Samsung PSU today too but sadly a chip was gone and I can’t find it to buy anywhere. So instead replacing of a 3€ chip I have to buy a new PSU board for 80€.... :(

[@wisher21uk]

What board is it what’s the model number of the tv I have loads of boards here

[@macdonaldmakwemba9887]

Well done

[@Vo0d0o2009]

take the drill , and fit a to-247 K**** 600V 18A mosfet and enjoy cryptonite repair :) nice video like at all

[@balik.electroservice]

Thanks

[@2000striezel]

I had an electronic shop and if I had such a "technician", I would throw him out at once. What a bungler, terrible!

[@Junior-ff7ee]

Hie sir may your give me the lesson you did on short killer have checked but cant see it

[@cjdelphi]

From now on my wife will be powering on any tv repairs i make 🤣

[@WeFixTvs]

Hi Sorin nice to meet you here, im doing tv repairs, if you interested I can give you some advice and show you really great tools they will make your tv repairs easy

[@IsaacOLEG]

Hello, too bad (!) Not the LG (unless they use Samsung boards ?) do you have a video on the alim of the LG (LB550B) ? I understand they may be very similar and I am not that lazy, but so much of a beginner ... Best

[@MohsinAli-ov5ow]

I am surprised you are dealing with switching power supply and not using 200W series lamp .................

[@alokaditya6873]

Help me... I m confused.. how to choose alternative mosfet.

[@TheMrjogas]

Same board and bridge rectifier first pin cut same 😁👍🤯😁

[@Tutterzoid]

I got a desoldering pump in my first year as a trainee Technician .. Dude, you really need to Google what that is and get one and use it :)

[@MsTomisek]

LG 42LB550V TV just flashes a little red and does not want to let go we can help thanks

[@nature_lover85]

esti tare ce sa mai :)

[@patrickdurees3025]

i have same tv but the problem with mine is it keeps restarting any tips as to what caps or other parts that need changing

[@mountaindew2430]

I have a sanyo fw55d25f that has no power and no lights.I replaced the power board and still nothing.Any suggestions on a fix

[@jundeguzmanjr.301]

sir can you make a video regarding COF in led tv that is burn.how to jumper in side COF

[@karaors8970]

+1 NİCE repair

[@shaunspellman2856]

Hi, my 42" digital lifestyles LCD has power but no picture or sound then shuts off into standby mode!! HELP

[@61spindrift]

HELP? Ya you and thousands of others that are too lazy or not educated enough to figure it out yourself. Then bring it to a repair shop and pay to have it repaired instead of asking for free help and then when it does not work talk bad about him.

[@shaunspellman2856]

@@61spindrift thanks God Bless you!!!

[@61spindrift]

@@shaunspellman2856 Shaun, maybe my comment was a bit harsh, but it seems just because a person graces us with a video everyone jumps on the guy and believes he must answer their specific question and fix their device. And like I said, when it does not fix it they give a thumbs down or leave a bad comment.

[@shaunspellman2856]

@@61spindrift I totally understand! However, I'm not that type of person! I always look for a solution no matter how long it takes. If I don't find it, I don't get bitter, I keep it moving. I've actually been in contact with the person who posted the video and couldn't find the step by step video posted many years ago. I do have the correct parts and searched for the hard to find video. With regards to your comment, I didn't take it personally. There is so much negativity in this world and I just refuse to add to it! I try to only put out good vibes and positivity! It's a great and satisfying feeling when you can DIY and succeed! I appreciate your comment..... Spread light! 👍🏾

[@61spindrift]

@@shaunspellman2856 In retrospect, when I have a problem that needs fixing, I guess I would do just about anything to accomplish it. And...it never hurts to ask. Good day sir.

[@melplishka5978]

Christian is a good sport lol.

[@ziggy_makes_videos]

Good job boss

[@dynastysong]

Awesome!

[@captainjim1010]

Which was the model of the TV i think i have the same one with the same problem! Thats not a LG 42LB550V (written in video title) it is a Samsung TV

[@hisheighnessthesupremebeing]

@29:00.. "replaces" fuse with a wire... Just for testing.. Yeah right you are not fooling us.. Sorin you are the master of dodgy repairs.. No way that is replaced

[@widyahong]

thats nice if you put more little thermalpaste on mosfet

[@dilanoclarke8114]

I want to learn how to check mosfets properly

[@61spindrift]

GREAT! Don't let us stop you

[@rajatthakur9091]

My laptop was not turning on and also my adapter was blinking then I tried mentioned methods in lenovo forums I removed battery, removed Cmos connector, then held power button for one minute and then without connecting battery provided a direct power to laptop, it blinked for But it blinked for a second and then went dead. Then on youtube a guy showed a step "to remove keyboard connector flex and then turning it on by novo switch and it worked. So now keyboard is dead but laptop is working. Is there any way to solve the issue Kindly help

[@richardcranium5839]

funny you grab the same board and the same mosfet is missing. i played with tv and vcr repairs 30 years ago and inevitably found that common failures in the same model were well ....... quite common. save a few cents over thousands of sets................. or just plain bad engineering.

[@3mariusx]

Salutare. Esti roman? 😮

[@sniper5406]

31:00 i wish iam that guy working with Sorin 😞

[@Igot2fly1]

Funny you let Christian plug in. I wanted to see it pop.

[@SajjadAli-lr2nh]

Guys anyone knows where sir sorion work and what is shop address Plzzzz

[@dimitarnikolov3527]

Replacing a MOSFET with a tube, will be a fun video! FOR SURE!!!

[@sreerajs6236]

What you said his name is "Krishnan"? from India?

[@chrisblank9090]

mr. sorin the power supply will work even without that mosfet

[@kosxer]

Don't forget to replace the fuse !!!

[@KNFIX-CUCHI]

i like it

[@BruceLee-zw5ue]

Sounds like butterfly mines, soviet made.

[@zx8401ztv]

You always replace the fuse... ha ha :-D That pcb looked cooked, the mosfet was working very hard.

[@deft3562]

I saw that flag waving on some electronic repair channels 😆. Hello there, guess we have same hobby

[@zx8401ztv]

Bambo Leo Yes ive been repairing electronics since i was a kid, but im still thicker that a bankers wallet lol. There are lots of things i may never fully understand, but that never stops me repairing stuff. My habit of taking things apart to glean an understanding is still alive :-D

[@deft3562]

@@zx8401ztv Brilliant. Keep grinding eh. Seems youre way advanced than me lol. Im still new at these things it began about 3yrs ago and im 23 now but should keep open minded for new thing to learn, and here we are with madlad Sorin, the best on yt. Yeah electronic is fun really fun. Cheers mate 👍

[@kadmaster]

Yuppi..I like tv repair videos...but come to besiktas...so we can watch besiktas matches Sorin! Be careful at fusable resistors!!!!

[@SajjadAli-lr2nh]

Do you know his his shop address

[@kadmaster]

nope I dont sorry...

[@jeraldleung6009]

Use other mosfet leg to bridge (extra resistance) that will be cracked over time, even with heat sink if no new thermal paste