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Old 06-26-2022, 08:58 AM   #1
SolarFlare
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Arrow Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works fine.

Hi,

My barely 3 year old TV has stopped displaying video, although the video output comes for a few seconds after turning ON which displays the manufacturers logo then shows the home screen (all this with some blue flicker) then the video goes blank and the screen is dark blue with the backlight on. The audio output works perfectly and the TV also takes in voice commands(smart TV).

The TCON board has the following Chips -
Samsung VTU63A0
RT6939 - 2nos.

and all these chips are getting real hot within a minute, I dont know if this is normal.

I have attached the pics of the same with the voltages at the respective points also.

I desperately need help.

Thanks!
Attached Images
File Type: jpg volts1.jpg (580.4 KB, 10 views)
File Type: jpg IMG_20220626_173336.jpg (590.2 KB, 8 views)
File Type: jpg Screenshot_2022-06-26-20-25-36-44_99c04817c0de5652397fc8b56c3b3817.jpg (186.4 KB, 8 views)

Last edited by SolarFlare; 06-26-2022 at 09:58 AM..
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Old 06-26-2022, 09:59 AM   #2
dskall
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

Looks like a short or bad panel. Check all the little brown caps on panel board and t-con for shorts.
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Old 06-26-2022, 10:16 AM   #3
SolarFlare
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

I checked all the capacitors in the TCON and there is no short.... how do I check a short in the panel?

the panel board is integrated with the TCON. Please have a look at the pic attached....
also any place I can get the datasheet for RT6939?
seems like they made a TV with all the obsolete parts they could find and i bought it.
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File Type: jpg IMG_20220626_215027.jpg (520.9 KB, 9 views)

Last edited by SolarFlare; 06-26-2022 at 10:24 AM..
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Old 06-27-2022, 03:46 AM   #4
jimbofz
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

i tried everywhere for purchase of these chips .
in the end i gave up and scrapped tv sorry ,
perhaps someone can supply one from a scrap panel
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Old 06-27-2022, 07:28 AM   #5
SolarFlare
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

Quote:
Originally Posted by jimbofz View Post
i tried everywhere for purchase of these chips .
in the end i gave up and scrapped tv sorry ,
perhaps someone can supply one from a scrap panel

oh ok... what could be the problem in my case? I checked the caps and they all seem to be fine i.e. no shorts i am lost as to what could be the problem
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Old 06-27-2022, 07:36 AM   #6
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

did you checked the BL working or not ?
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Old 06-27-2022, 08:55 PM   #7
SolarFlare
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

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Originally Posted by Diah View Post
did you checked the BL working or not ?
yes the backlight is working fine
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Old 06-30-2022, 09:02 PM   #8
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Default Re: Mi TV 4 Pro-Samsung Panel LSC550FN20 - Video problem, backlight and Audio works f

Quote:
Originally Posted by Diah View Post
did you checked the BL working or not ?
What you suggest I could do??
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