Mitsubishi TV Model LT-55164

[Nyjetfan21]

I have a Mitsubishi model number LT55164 television. About five weeks ago I was watching TV and I heard a little pop noise and I lost picture and sound right after that happened. I brought the TV to a local repair shop and they told me that it was the main board . The repair man ordered the main board installed it and tested it and he called me and told me that they sent him a defective board and he told me to come and pick up my TV after he put all the original parts back in it. He told me that he could not find the part anywhere else. How can I tell if the new part that they sent him was bad or could it be my power supply board that is bad in stead cause he told me it is definitely the main board when I mentioned that to him any help would be greatly appreciated thank you

[dick_barton]

Re: Mitsubishi TV Model LT-55164

If you post clear pictures of your circuit boards would be a good starting point.
Without any measurements it would be quess work at this point.

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

How do I upload pictures on this site. I have the photos saved in my iphone

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

How do I upload pictures on this site. I have the photos saved in my iphone

I think i figured out how to upload the picture i have please let me know if this is good

[budm]

Re: Mitsubishi TV Model LT-55164

What tools do you have and know how to use them?
These look like to be your board:
http://www.shopjimmy.com/catalogsear...lt/?q=LT-55164

There are pin labels on the bottom side of the power supply board.
You will need to do good visual inspection and then check the fuses if they are good or not, check Voltages at various connectors and at the main filter cap of the power supply board, etc.

[dick_barton]

Re: Mitsubishi TV Model LT-55164

Does the front led power up and does it have a blink sequence, slow x fast

What dc voltages do you have at connectors PA, PB and PC

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

When the tv is plugged in the power light constintly blinks pretty quick.The tv wont power up or do anything at all it wont even respond to the remote.

[dick_barton]

Re: Mitsubishi TV Model LT-55164

Measure the voltages at the connectors and post your results.

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

With the TV plugged in.At PB I have 5 volts, at PC I have 5 volts as well and at PA some pins are 5 and some pins are around 55 volts. I used the metal plate that all the boards are bolted to as a ground. Let me know if I did it right and what the next step should be. I did notice when the tv is pluged in besides the blinking green light there is a steady Blinking red light as well that the pc wire From the power supply board goes to this Board And it is covered with a metal shield and it says high voltage on it

[budm]

Re: Mitsubishi TV Model LT-55164

With the TV plugged in.At PB I have 5 volts, at PC I have 5 volts as well and at PA some pins are 5 and some pins are around 55 volts. I used the metal plate that all the boards are bolted to as a ground. Let me know if I did it right and what the next step should be. I did notice when the tv is pluged in besides the blinking green light there is a steady Blinking red light as well that the pc wire From the power supply board goes to this Board And it is covered with a metal shield and it says high voltage on it

Next step?
Report the Voltage reading by including the pin name and follow by the Voltage reading:
Example:
https://www.badcaps.net/forum/attach...9&d=1507281259

PA connector
Pin 1 dimming = xxx V
BTW: this statement" and at PA some pins are 5 and some pins are around 55 volts."
Which pin is that giving you 55V?

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

I recently checked all the capacitors,fuses etc and everything had voltage going to them. The problem ended up being the heat sinks on the main board. So I popped the top of the heat sink off and put flux around the edges of the heat sink that is soldered to the main board and heated it up with a heat gun for a couple of minutes and let cool as well for several minutes. Turned Tv on and it worked.So I reinstalled the top of the heat sinks and put alittle hot glue on the to hold them in place in case the fall off the main board and short it out. Then I installed a permanent fan in the tv that runs constant off the power board to keep the tv cool and so far so good

[dick_barton]

Re: Mitsubishi TV Model LT-55164

Hopefully you'll have plenty of viewing time but it does tend to be only a short duration fix.

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

Is there anything you suggest that i can do for a permanent fix

[dick_barton]

Re: Mitsubishi TV Model LT-55164

You could approach people who repair X-Boxes and Playstations who would have the tools for reballing the BGA chip

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

is that something that is expensive or is it something i can do myself and if so where can I get the parts

[dick_barton]

Re: Mitsubishi TV Model LT-55164

It's something best left to the experts who have the tools and experience. I do not know what it would or could cost, however as I said your tv may work for days, weeks or many months so it was just to make you aware that it's rarely a permanent fix.

[Nyjetfan21]

Re: Mitsubishi TV Model LT-55164

ok ty for all the input.Ill keep you posted on what happens or I decide to do.TY to everyone