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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Problem with TV Toshiba 50L7335DG

 

 


preebi4
New User

Feb 25, 2019, 1:49 PM

Post #1 of 10 (266 views)
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Problem with TV Toshiba 50L7335DG Can't Post

Hello, I'am having trouble with TV Toshiba 50L7335DG. The tv turns on, backlights is starting but no picture. I think there is audio but not sure because cant test it. There is only noise like working but no input signal. The question is how to understand where is the problem - main board, t-con board or lcd panel. The power supply board seems to be working fine because all voltages are correct. Main board is 32L4300 rev 1.02a, t-con is v420hk1-cs5. I try to find schematics to check some control points but nothing came up ( maybe search wrong i dont know).
Thank You!



preebi4
New User

Mar 20, 2019, 12:28 PM

Post #2 of 10 (203 views)
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Re: [preebi4] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

Replaced the t-con board and nothing. How can i check the lcd panel whether working or not ?


jts1957
Veteran


Mar 23, 2019, 9:59 AM

Post #3 of 10 (186 views)
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Re: [preebi4] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

If you can apply an audio input and correctly select the inputted audio, would tend to prove the Main & Panel = OK


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preebi4
New User

Apr 3, 2019, 12:38 PM

Post #4 of 10 (146 views)
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Re: [jts1957] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

I connected an audio source to AV input on tv and with headset ( because speakers are disconnected ) but didnt get anything.... Tried with the remote to select different sources but no luck. There is some popping sound from time to time but no audio at all. Optical jack is glowing in red, there is some green led flashing in the middle of the board but nothing... I dont know what to do more. I guess will put it away


arizanotlari
New User


Apr 5, 2019, 11:49 AM

Post #5 of 10 (132 views)
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Re: [preebi4] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

Hello.

http://www.dl.toshiba.com/tsb-dtv/NA/GB/EN/40L6353RK.html downland firmware and install.

check tcon supply (5v or 12v)

be sure backlight is working. i wait your answers.


preebi4
New User

Apr 8, 2019, 6:10 AM

Post #6 of 10 (117 views)
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Re: [arizanotlari] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

http://prntscr.com/n8ww67
This is the voltages on t-con. How to install this firmware with no picture ?


arizanotlari
New User


Apr 8, 2019, 2:33 PM

Post #7 of 10 (113 views)
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Re: [preebi4] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

http://fget.dl.toshiba.com/...tion_Instraction.pdf


(This post was edited by arizanotlari on Apr 8, 2019, 2:34 PM)


preebi4
New User

Apr 9, 2019, 5:35 AM

Post #8 of 10 (108 views)
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Re: [arizanotlari] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

Yes i saw the instructions thats why asking .....
http://prntscr.com/n9edmk


arizanotlari
New User


Apr 9, 2019, 6:17 PM

Post #9 of 10 (105 views)
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Re: [preebi4] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

If usb stick led is blinking, upgrade successful : check lvsd lines on mb and tcon.

If usb stick led is not blinking, upgrade failed : mainboard is not working correctly.

Sorry my english Blush


preebi4
New User

Apr 10, 2019, 6:44 AM

Post #10 of 10 (86 views)
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Re: [arizanotlari] Problem with TV Toshiba 50L7335DG [In reply to] Can't Post

in the begining usb flashes but after that ( about 1 min ) starts glowing constantly and the green led at MB starts flashing 3 times

 
 
 


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