arbitarytwist
Member
Last Activity: 04-25-2025, 10:53 PM
Joined: 11-11-2016
Location: BC
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How do i go about troubleshooting the mainboard.... -
Samsung UN50NU7400 - No Picture (but boot screen and screensaver)
Have a Samsung UN50NU7400 which shows a boot screen and a screen saver if left on long enough but no picture ?
Would a moving screen saver confirm that the panel is ok or it could still be a panel issue ? -
Samsung UN82TU7050
Have these lines on the top that seems to follow the pictures/menu below. Any idea what the issue could be.
[URL]https://streamable.com/ajcyy3[/URL]https://Have these lines on the top ...m/ajcyy3[/URL] -
A tinerker who want's to learn more about electronics troubleshootingLeave a comment:
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Re: LG 43UK6300 - Audio & Backlight, but no Video
I tried that already. Makes no difference....Leave a comment:
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Re: LG 43UK6300 - Audio & Backlight, but no Video
So i did a bit more digging and following are the voltage readings i got
OFF (V) ON (V)
B 7.8V 10.5V
E 7.8V 13 V
C 0V 0V (No Transistor in Place)
This makes me think its a PNP transistor. I am wondering what i can use as a transistor to make this work.Leave a comment:
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Re: LG 43UK6300 - Audio & Backlight, but no Video
With the postage values do you concur there is no short ? How would I go about finding a replacement transistor. Can't find any part# on the old one.
Is there anything else I could do to be 100% sure it's not the panel....Leave a comment:
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Re: One blinking SMD
This youtube video is for the same issue for the same model.
[url]https://www.youtube.com/watch?v=oFFMpmak2cI[/url]Re: One blinking SMD<br /> <br /> ...Mpmak2cI[/url]Leave a comment:
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Re: LG 43UK6300 - Audio & Backlight, but no Video
So i took some measurements with panel cables disconnected to ground and am getting 30 KOhm, 50 KOhm and 80 Ohms on the emitter (leg by the R1104). With the panel cables hooked up, there isn't much change....Leave a comment:
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Re: LG 43UK6300 - Audio & Backlight, but no Video
OK did some more looking around and seems like a burnt Transistor. I wasn't that pronounced, as in the original pics i posted, but i figured i try the oven bake and it made it more obvious. The behavior is the same as before the bake in.
I have attached some closeup pics (before over bake as seen in Pic #2 in original post).
How would i go about finding what the transistor and perhaps replace it. The two resistors above it when measured are around 70 Ohm each although there is some discoloration on one...Last edited by arbitarytwist; 02-20-2020, 10:13 PM.Leave a comment:
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Re: LG 42LE7500 TV Backlighting but no Picture
Did this fix your issue?Leave a comment:
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LG 43UK6300 - Audio & Backlight, but no Video
I have a LG 43UK6300BUB that has Audo and Backlight.
I am no TV expert, but have done some troubleshooting on TV's in the past.
When i turn the TV on, i can hear audio and the backlight turns on, but there is no picture. Most of the trouble shooting videos i have seen, have a seperate main and T-Con board, but it seems like on this unit, the T-CON and Main board are the same.
I have checked the voltages on the connector from the Power Supply and i seem to be getting 13V, 3V & 2V to the Main board. I tried disconnecting one panel cables at a time... -
Re: Lg 50pg60
Vy = 180.6V
Vsc = 150.4V
See attached pic of when the screen comes on bright and then it goes dim. I get those vertical bands. Don't know if its something after i removed the Y-Buffer boards or before....Leave a comment:
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Re: Lg 50pg60
So i disconnected both power connectors to the Z-SUS. TV comes on, although not the initial bright screen. Still see the two bands on the screen as before....Leave a comment:
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Re: Lg 50pg60
Added pictures to original post....Leave a comment:
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Lg 50pg60
I picked up an LG 50PG60 with a blank screen but has sound.
I pulled the Y Buffer and checked for IC shorts and it seem to be ok. I am not sure how i would check the Y-Sus and Z-Sus boards. I checked the power to Vs and Va and they all seem to be within spec.
First time trying to fix a TV let alone a Plasma. Have electrical knowlege but no electronics expert.
See link below for a video. Screen comes on bright and then goes dark. There are two vertical bands towards the right of the tv screen (bottom in this video as the TV is sitting sideways).
...Last edited by arbitarytwist; 11-11-2016, 12:52 PM. -
Re: New Members - please post your introductions here
Hello everyone. Been reading on this forum for a while. Great resource.Leave a comment:
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