TV Repair Questions? Ask a TV Technician
I have a little knowledge on radios and TV's but I am color blind and I am limited at this point..
Unfortunately, there are three components that can cause the problems you're having.
I will try to explain this the best that I can here.
There are several things which could cause your problem. One is the Mainboard, the other is the T-Con (LCD Timing controller), or the Backlight Inverters.
As a quick test to see which board is causing the problem, disconnect the Backlight Inverters from the supply and see if the TV will power up without them connected. If so, you've found the source of your short, and would replace the backlight Inverter.
If the symptoms are the same with the Inverters disconnected, then you'd want to disconnect the two ribbon cables connecting the mainboard to the T-Con board- which is the small 5" x 7" board mounted at the center of the LCD panel. If the set powers up and stays on with the T Con disconnected, then you'd replace the T-Con.
If the set acts exactly the same whether or not the T Con or Inverters are disconnected or connected, then your mainboard is suspect, and the only board that you can't really test. The Mainboard works in tandem with the power supply to produce the rated voltages responsible for the TV turning on/off.
The link below is where you can visually identify, as well as purchase replacement boards for your TV:
If you need further assistance, simply reply back and I will be online later to assist you further (I have to step out and pick up my daughter right now).
If you're satisfied with my service, please kindly rate the answer accordingly.
Okay, I have a doctors appointment at 2 P.M. so I will get back to you after that.
Sorry, I am back, Got back late and I guess you were gone. Are you here now?
Okay I have narrowed it down to what I think it must be the main board I think. I have removed the mainboard and the power light will not come on.
Is this right?.
I will have to put it back in and go from there. I will be back later.
Okay, I hooked up the mainboard with it connected only to the power supply and it will not come on at all. Not even the power light. What now?
I hooked it all back up and did what you said. I disconnected the T Com and the power light came on and went off like before. I connected the T Com back up and tried it again and the power light would not come on at all. I disconnected the inverters and the power light would not come on.. Does the T-Com have to time out before it will be able to power up again?
The power light will not come on at all now regardless of which one is connected or disconnected.
Yes everything looks okay but while checking I noticed the power button on the side of the cabinet is pushed in passed the cabinet hole. I can push it and I can hear it click.but it doesn't feel right. Do you have to take off the whole back to get to it to check it?
I had it off but I put it all back together. I just had it where I could just hook and unhook the cable connecters. Well back to tearing it apart.
I have now check the power button and it is okay. Hooked it all up and no power. Disconnected the T Com and the power light will come on and then go off. Connected the T Com and disconnected Inverter and no power. I then connected both up again and the power light comes on and then goes off. Makes no sense to me.
But with the inverter disconnected, shouldn't the power light stay on?
I have the inverters out. Is `there any way to check them other than visibly?
I will order the inverters and will get back to you then.
They were out of stock. I will find them.
Aric, Are you there?
I'm not on my PC but an on and off of the phone. Simply reply back as you would with email.
This is where I am at. I replaced the inverters and hooked it up and the power light would come on and then shut down just like before. I also got another main board and installed it and the power light would come on and stay on and the screen would flicker and that would be it. I tried scanning through the input menu with nothing happening.
Now I took out the new inverters and replaced them with my old ones and still no picture. I am getting sound though.
Are u There?
No I'm sorry I'm not online. Can you tell me if you press the menu if the menu will show on the display?
I'm standing by waiting on you. Let me know when you are ready.
No.....Nothing on screen. It will come on for a split second. I have anidea that I got some bad inverters. I have ordered another set. Could it beanything else?
I have put in another power supply board and it does the same thing. It will come on with sound and the screen will flicker a split second with the sound staying on.
I can't see anything with the flash light. The inverters that I bought were used so that is why I think they may be bad. Also do the plugs connect directly to the power board?
It is just as dark on as it is off.
Even though it briefly comes on and goes off, it is bad.
I still have inverters that I had already bought and they will be in Tuesday. I would like to try those before I give up. One other thing that bothers me is that the main board and the LCD panel going out at the same time. All the parts that I have used are used parts and it is possible that one of those may be bad.
Is there a fuse on the T-CON board that may be blown?
Do the ribbons disconnect from the t-con or are they mounted on to it?
They disconnect from the T-Con. There is a flap at the bottom of the connector that lifts up to free the ribbon cable up to remove it. There's a Youtube video below that shows how this is done:
I can't seem to find the tab. Is other ways they connect?
Is there something different on the Sanyo for disconnecting this as I watched this clip and I can't find the tab to click up.
I am stuck here. I have four ribbons that I cannot get off. These are a little different than the ones in the clip I watched. If I could get these ribbons off, I would just go ahead and get another t-con.
Here are some pictures if this will help.
are u there?
Never min d on all the last post....I got it out. It flipped down instead down.
OK I found a 3 AMP fuse on the board and it checked good.
Yes.....It was good.
Ok...will check them out Tues.
Aric, The inverters that were suppose to be in today never arrived. I said I would try my old inverters and swapped them out. Bingo....I had sound and a picture. I don't understand why but I had the original inverters in first and it wouldn't work. Everything is okay now. I almost scrapped it out. I even bought another Sanyo TV online and it's suppose to be in this Friday.