problem with LED42VF80 .. Many Pics !! need help!

[Keshetisrael]

I'm working on the Viore LED42VF80.

I have searched the Control board, the Main Board and the Power Supply Board for blown Electrolytic Capacitors, to no avail .. by sight alone.

I'm just an apprentice in this and learning, as I probably will always claim no matter how much more of this work I continue. Which I can only hope does.

So.. let me tell you what I have done already and maybe you (someone) can coach me thru the routes I need to in order to press forward to the wanted end result; a working T.V.

I have a digital multi meter (2) and even a new digital oscilloscope that I'm dieing to learn how to use!

So.. let me show you the dilemma..

LED came to me and would turn on for a little bit, a white Viore Logo Screen and then after a few seconds it would turn off.

I have read this Thread: https://www.badcaps.net/forum/showthread.php?t=20369

And followed it unto belief that it was the Video Mainboard, which I found was the house of the inverter, by calling and asking a tech at viore what the part number for the inverter was. He actually showed me how he looks up part numbers thru encompass parts.

So.. anyways.. I ordered the part, I put it in and the T.V. came right up. The Viore Logo Screen came and went a Very Blue Screen came up and a floating menu appeared. Well, I had another call to go out on so I left it on my bed turned on, knowing I'd be back within an hour. I came back and the T.V. Was off and now when I turn it on, the viore logo screen and back light don't even kick on.

Now.. if you look at my pics.. you see I have the equipment to figure this out.. I'd like the consistent know how to do this so if anyone has the patience to help me thru the first one.. (Or two .. lol) I'd be Really appreciative and over joyed!

urbanpcguru@gmail.com -Keshet Israel Aka: Mike Cofer

[rayxoxo]

Re: problem with LED42VF80 .. Many Pics !! need help!

Have you tried using circuit cooler when it goes bad? Sounds like a thermal problem.

Buy a can of it and spray the suspected area - If it kicks on then tighten the spray area to less and less components. You should be able to get your problem down to 2 or 3 parts.

Hope this has been a help.

[Keshetisrael]

Re: problem with LED42VF80 .. Many Pics !! need help!

Have you tried using circuit cooler when it goes bad? Sounds like a thermal problem.

Buy a can of it and spray the suspected area - If it kicks on then tighten the spray area to less and less components. You should be able to get your problem down to 2 or 3 parts.

Hope this has been a help.

Namaste...

I ordered a couple cans of Freeze Spray off ebay.. BlowOff..
the STream is so full of what appears to be 'liquid', I was afraid to spray the TV when I got the stuff, fearing it might blow the thing up!! You sure it's Ok?!! What about when the T.V. is on, after the TV has gone off but the green LED is still on??

Anyways.. I let the TV sit for along time in the corner.. lost the customer it's sat so long. I realized from that, that I'm not ready to 'put' myself out there, to service people's T.V.'s until I can get it in my mind that I know what I'm seeing and doing.

The only way I can do this is to get one full TV done, by my own troubleshooting finding the component or cause of the 'problem', remove and replace the component and see it working.

I've worked on a couple (4) LCD Monitors and replaced a couple capacitor's, got a few to work for me again, I'm waiting on caps for 1 right now actually.
I took two 32" LCD's apart which I bought from a junk guy, and just switched out the Panels; got it to work for awhile, but now it appears after about an hour the TV goes off. I'll have to open it back up soon.

I Have a Dell W3000, I have taken apart multiple times, replaced a Tcon for the thing, broke the casing on accident (hard beginnings!) in the process, only to find the TCON didn't fix the problem! I've just ordered four 150uF 35v Caps for the Two Panel Boards (X,Y); saw a little flux burn maybe some heat damage.. The picture comes on but wavey lines are in the screen in about a 4 inch wide Stripe going from top to bottom.. more on one side..but also a straight line right down the middle of it.. <comments welcome: Dell W3000>

I have a Sony LCD monitor (PCG-81) and some 100uF 35v for the inverter board, the LCD comes on but it goes pretty hazy.. the LCD Panel in this thing appears to have come with it's own Tcon board inside the back of it.. removing tape I could look at it.. and should have when I was there but didn't..go figure!

So Anyways.. after that I got this beast out of the corner.. the LED42VF81
A thermal issue.. what's strange is .. I replaced the Video board, it did the same thing. Then I bought and replaced the power board.. It does the same thing.

Both boards bought off Ebay, and it does the same thing.. So, then I took the new video board off, put my old one back on; it still is doing the same thing.. only it takes a little longer before it goes off the first time, but though I can turn it right back on, it turns off sooner.. So, obviously making it appear to be a thermal issue.. (Overheating Issue) but what..? LOL

I guess it would be handy to get one of those Laser Thermal Temperature Gauges, could shine it on each processor and see what the temp is on each of them.. see if their within specs.. my problem.. has been.. finding data sheets for the components I come across.. I haven't found one yet.. but I've found lots of Search Engines for them..)

42" piece of expensive nothing! Damn't man! Ok.. Guess I'm going to pull that black tape off the top of the back, and look at the X & Y Boards.. I haven't put an honest look over those.

I invite anyone who knows what would be the next best step.. to know that I have a mind, can understand well enough..I hope; have an oscilloscope, time & patience to shut up and listen (focus) so that I learn this oscilloscope Rigol DS1102e as though it's my own best body part! I have a DMM too.. with alligator clips. No capacitance meter.. or LCR meter..

I am working on another TV Project.. that I'm putting the full Project up on here.. It's a Sanyo Dp26746 I've studied and Read, and studied the Math of ohms law and power, studied how to figure voltage drops to figure current and all those goodies..

I was an electrician's helper for 4 years before going full time fixing computers, which I learned when I was 21.. I'm 42 in Jan.

I've been studying electronics, practicing with electronics, here & there; but I have been divided, trying to keep up with HTML5, PHP, JavaScript, Python, ActionScript & studying the in's & out's of microprocessors and other programming languages, while also being a political news junkie!

I've used a bread board and now I'm learning new circuits and practicing with a virtual bread board, learning components and learning how to verify everything. Guess you heard of Fritzing?

I have as of yet to get an arduino but would love to be able to and believe that to be a next step in my 'processing' of electronics, but really need to solidify my 'confidence' in 'repairing' electronics so I can fund my learning process in the hopes of 'engineering' a processor, and a computer language, and whatever might tare down the walls of corporatism while abolishing all human 'mental enslavements along with the medical 'Cage' that 'Government' and the Medical Mafia has put upon us!

Anyways.. LOL .. On to the Next TV! Plasma I think.. later!
blah blah blah..blah blah blah.. lol.. sorry to talk your ear off, you could have left me hanging.. I'm not really here anymore! ROFL..

:sign: Namaste & Shalom

[leo25]

Re: problem with LED42VF80 .. Many Pics !! need help!

Did u ever fihure out the problem with what was over heating cause I cant figure mine out either and I have the same exsact problem

[bwcbob]

Re: problem with LED42VF80 .. Many Pics !! need help!

Dead unit even with a new power supply, We have found that the problem is inside the LED panel, To be more specific the red B+ wire on the led strips is touching the aluminum ground plane on one or more LED strips, To verify without taking the panel apart just disconnect the 4 sockets and measure for a short across the pins, If shorted then the problem is inside the panel.
Reason of failure is the close manufacturing tolerances, The Plexiglas reflector is to big and the corners right on the top of the solder connections are pushing against the red B+ wire on the left and right strips thus creating a short.

[merchantweb]

Re: problem with LED42VF80 .. Many Pics !! need help!

Hi bwcbob,

I'm trying to test my led like you say to do, but I'm a novice at this so when you say disconnect the 4 sockets and measure for a short across the pins I think how can you measure for a short if the panel is disconnected? I am new to testing electronics though so any elaboration or even diagram would be amazing. I have a digital multimeter.

Thanks!

[TechGeek]

Re: problem with LED42VF80 .. Many Pics !! need help!

Hi bwcbob,

I'm trying to test my led like you say to do, but I'm a novice at this so when you say disconnect the 4 sockets and measure for a short across the pins I think how can you measure for a short if the panel is disconnected? I am new to testing electronics though so any elaboration or even diagram would be amazing. I have a digital multimeter.

Thanks!

Just switch the multimeter into continuity mode and put the leads across the pins/leads in question.

[budm]

Re: problem with LED42VF80 .. Many Pics !! need help!

OK, when you remove the female connector (the one with red/black wires) from the circuit board, those wires on the connector go into the LCD panel assembly which contains the LED string assembly, those wires may get nicked by the sharp edges of the panel so it make contact with LCD panel metal chassis. So for you to find out if that is happening with your LCD panel or not, you need to check the resistance between the metal chassis against each pin of that female connector to see if any one of them show resistance readings.