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Old 01-10-2020, 12:26 PM   #1
MeAndTheBoys
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Default Toshiba 50L7363D image issues (t-con?)

Hi folks,
I have a Toshiba 50L7363D on my workbench wich has image issues.
Ive not opened it so far (will do so tomorrow)
Do you have a hint where I can start troubleshooting?

I suspect t-con board?

I have the equipment (at work) to replace smd chips and even BGAs, so I`m aiming to avoid replacing whole (expensive) bords.

Thanks in advance!
Ben
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File Type: jpg IMG_2768.jpg (420.8 KB, 27 views)
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Old 01-13-2020, 02:02 AM   #2
MeAndTheBoys
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Default Re: Toshiba 50L7363D image issues (t-con?)

Quote:
Originally Posted by MeAndTheBoys View Post
Hi folks,
I have a Toshiba 50L7363D on my workbench wich has image issues.
Ive not opened it so far (will do so tomorrow)
Do you have a hint where I can start troubleshooting?

I suspect t-con board?

I have the equipment (at work) to replace smd chips and even BGAs, so I`m aiming to avoid replacing whole (expensive) bords.

Thanks in advance!
Ben
Update:
Reseated all ribbon cables, no improvement.
T-con is a CHIMEI INNOLUX V420HK1-CS5

Can anybody help me out with a clue? :-)
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Old 01-13-2020, 02:27 AM   #3
yokoono
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Default Re: Toshiba 50L7363D image issues (t-con?)

Check for starters that there are no backlight issues.

Last edited by yokoono; 01-13-2020 at 02:29 AM..
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Old 01-13-2020, 03:44 AM   #4
nomoresonys
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Default Re: Toshiba 50L7363D image issues (t-con?)

One possibility: https://www.youtube.com/watch?v=H4sro4FMq18
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Old 01-13-2020, 09:46 AM   #5
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Default Re: Toshiba 50L7363D image issues (t-con?)

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Originally Posted by yokoono View Post
Check for starters that there are no backlight issues.
i checked that. I also have this wierd double Image, wich I suspect has nothing to do with backlight. The light is nice and even through the whole picture.
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Old 01-13-2020, 09:47 AM   #6
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Default Re: Toshiba 50L7363D image issues (t-con?)

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Originally Posted by nomoresonys View Post
Thanks, will check that tomorrow!
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Old 01-13-2020, 09:56 AM   #7
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Default Re: Toshiba 50L7363D image issues (t-con?)

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Originally Posted by MeAndTheBoys View Post
i checked that. I also have this wierd double Image, wich I suspect has nothing to do with backlight. The light is nice and even through the whole picture.
I thought this is the original image, not the double image. Hard to say. 50% t-con, 50% panel. Because it is cheaper the ideal would be to have a defective t-con.
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Old 01-13-2020, 11:00 AM   #8
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Default Re: Toshiba 50L7363D image issues (t-con?)

Maybe try the "cut tape" method: https://www.youtube.com/watch?v=j7vl7-vZEL8

Last edited by nomoresonys; 01-13-2020 at 11:01 AM..
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Old 01-16-2020, 03:40 PM   #9
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Default Re: Toshiba 50L7363D image issues (t-con?)

tried cut tape - didnt work - wierd thing is when I disconnect the right side of the t.con the left side of the image becomes clear !
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Old 01-16-2020, 04:04 PM   #10
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Default Re: Toshiba 50L7363D image issues (t-con?)

Replaced tcon, same issue....
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Old 01-16-2020, 04:08 PM   #11
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Default Re: Toshiba 50L7363D image issues (t-con?)

any damage/burnt parts on the lcd panel pcb
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Old 01-17-2020, 01:23 AM   #12
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Default Re: Toshiba 50L7363D image issues (t-con?)

Quote:
Originally Posted by vinceroger69 View Post
any damage/burnt parts on the lcd panel pcb
By LCD panel PCB you mean the ones that are recieving data from the T-Con?
I found no burnt parts on any pcb...
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Old 01-17-2020, 05:05 AM   #13
vinceroger69
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Default Re: Toshiba 50L7363D image issues (t-con?)

there is a pcb thats bonded to the lcd panel sometimes we see damage on this pcb liquid shorted smd caps etc
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Old 01-17-2020, 07:45 AM   #14
MeAndTheBoys
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Default Re: Toshiba 50L7363D image issues (t-con?)

Quote:
Originally Posted by vinceroger69 View Post
there is a pcb thats bonded to the lcd panel sometimes we see damage on this pcb liquid shorted smd caps etc
found no blown smd caps or liquid damage.
BUT
If i tape the 3 right contacts of the ribbon cable of the "bad" side of the panel I get a halfway decent image (see attachment)
One side of the image is still darker and slowly fades when changing the menu for example...

do you guys have any more tips? Im ready to give up on this one...
Attached Images
File Type: jpg IMG_2798.jpg (488.2 KB, 11 views)
File Type: jpg IMG_2799.jpg (425.9 KB, 9 views)
File Type: jpg IMG_2800(1).jpg (942.4 KB, 15 views)
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Old 01-17-2020, 08:33 AM   #15
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Default Re: Toshiba 50L7363D image issues (t-con?)

The smd caps won't look blow, have you tested for a short ?
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Old 01-17-2020, 09:16 AM   #16
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Default Re: Toshiba 50L7363D image issues (t-con?)

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Originally Posted by diif View Post
The smd caps won't look blow, have you tested for a short ?
just checked the caps on the lcd panel pcb. -> no shorts
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Old 01-17-2020, 09:47 AM   #17
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Default Re: Toshiba 50L7363D image issues (t-con?)

Bad panel. Last resort is to rip off the side tabs on the bad side.
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Old 01-17-2020, 10:31 AM   #18
budwich
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Default Re: Toshiba 50L7363D image issues (t-con?)

Quote:
Originally Posted by MeAndTheBoys View Post
found no blown smd caps or liquid damage.
BUT
If i tape the 3 right contacts of the ribbon cable of the "bad" side of the panel I get a halfway decent image (see attachment)
One side of the image is still darker and slowly fades when changing the menu for example...

do you guys have any more tips? Im ready to give up on this one...
The "tape mask off" method usually doesn't resolve issues on a panel that has side tabs IF the problem is with one of the side tab drivers. This is because the driver is still in the drive circuit for the panel and causing an issue which you are seeing. As suggested, the last resort is to removed the tabs from the "bad side". The result will likely be a good picture. This is assuming that the problem isn't with the bottom driver board on that side... such as a bad smd capacitor or connection to the panel in the bottom corner which is used to connect signals to the side tabs (ie. thru the panel edge).

Based on my limited experience with a 46in sony, you will likely be successful with the tab removal (the sony had an issue with connection in the corner).
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Old 01-17-2020, 11:18 AM   #19
yokoono
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Default Re: Toshiba 50L7363D image issues (t-con?)

High resistance on VGH, VGL paths between t-con and side drivers.
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Old 01-17-2020, 02:18 PM   #20
nomoresonys
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Default Re: Toshiba 50L7363D image issues (t-con?)

Well take it down to see the side tabs and look for damage or black or burnt looking cof (chip on film) etc. also see if any get hotter than the others, lots of times the problem is obvious once you get to the side tabs.

Last edited by nomoresonys; 01-17-2020 at 02:25 PM..
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