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Old 10-23-2013, 10:16 AM   #1
mguzinski
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Default JVC LT-22DE72 only 1/3 of display shows up

Hi All,
I'm fairly new here but since joining the forum I have fixed about 6 LCDs with new capacitors diodes and resistors. Once I did have to get a new board however.
This time I got a JVC LT-22DE72 that only displays the upper 1/3 of the screen. I have had this problem with laptop displays in the past and commonly it was a cable that needed replaced or reseated.
The display fully lights up when the video board to inverter board cable is unplugged. Sound and the image at the top 1/3 of the screed looks good. No obviously bad capacitors or any other burn marks on any of the boards. The display acts the same with any input source.
I have not measured any components as of yet but I have reseated all the cables and messed with the ribbon cables to see if the display changed at all. I have also tested continuity on the cable going from the video board to the inverter board and that tested fine.
Any other tips on testing this one? I'm a little lost right now.
Thanks in advance for your assistance.
Mike
[IMG][/IMG]
[IMG][/IMG]

Last edited by mguzinski; 10-23-2013 at 11:13 AM..
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Old 10-23-2013, 10:44 AM   #2
tom66
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Can't see the pictures you have linked?
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Old 10-23-2013, 10:47 AM   #3
mguzinski
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by tom66 View Post
Can't see the pictures you have linked?
Lets try the links...Can't seem to get them to use Google Drive to display them as IMG
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Old 10-23-2013, 10:59 AM   #4
aaronwt6
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

I'm going to vote T-con board but I've never seen one do this. Strictly a guess.
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Old 10-23-2013, 11:06 AM   #5
tom66
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

I'm going to say panel personally.
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Old 10-23-2013, 11:11 AM   #6
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by tom66 View Post
I'm going to say panel personally.
Was thinking the panel issues were usually oriented vertically. Not the case I guess? Just asking for future reference.

Still learning.
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Old 10-23-2013, 11:16 AM   #7
mguzinski
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by tom66 View Post
I'm going to say panel personally.
Now...not sure this is relevant but when I disconnect the cable from the main A/V board the display shows completely lighted up. Would that still be the panel? I thought if it was the panel only the upper 1/3 would show lighted like it is when it has an input.
Thanks again...
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Old 10-23-2013, 11:20 AM   #8
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by aaronwt6 View Post
Was thinking the panel issues were usually oriented vertically. Not the case I guess? Just asking for future reference.

Still learning.
Panel issues can occur in both axes.
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Old 10-23-2013, 11:23 AM   #9
aaronwt6
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by tom66 View Post
Panel issues can occur in both axes.
Ah ok. I gotcha. Just hadn't seen one that looked like that.
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Old 10-23-2013, 11:24 AM   #10
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by mguzinski View Post
Now...not sure this is relevant but when I disconnect the cable from the main A/V board the display shows completely lighted up. Would that still be the panel? I thought if it was the panel only the upper 1/3 would show lighted like it is when it has an input.
Thanks again...
All that means is that the backlight is working.
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Old 10-23-2013, 11:26 AM   #11
mguzinski
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by aaronwt6 View Post
I'm going to vote T-con board but I've never seen one do this. Strictly a guess.
Is the t-con board the same as the main A/V board on this set. The ones I have seen before have a separate t-con board.
[IMG][/IMG]
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Old 10-23-2013, 11:32 AM   #12
aaronwt6
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Looks like its all in one on this set then. I'd go with Tom's instinct over mine. He's been around a heck of a lot longer. Wouldn't put any money in to a guess on something that size.
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Old 10-24-2013, 10:53 AM   #13
mguzinski
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Default Re: JVC LT-22DE72 only 1/3 of display shows up

Quote:
Originally Posted by aaronwt6 View Post
Looks like its all in one on this set then. I'd go with Tom's instinct over mine. He's been around a heck of a lot longer. Wouldn't put any money in to a guess on something that size.
That sounds like a bummer...Some times you win some times you don't. Guess I can part it out. Seems like the LCDs are in the $120 range.
Thanks all for your advice and insight!
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