Need some help with this one. I fired it up and the backlight comes on but I don't get any picture or menu. I don't hear any sounds either. I tested the fuse on the tcon board and it appears to be good. Any ideas?
Thanks!
Ken
Thanks!
Ken
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
What voltage do you read at each end of t-con fuse?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
I'll read the voltage and export back. I just tested for continuity to see if it was open.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
.22v at the fuse on the tcon board.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
The main board is not sending the voltage to the T-CON, there should be a switched MOSFET on the main board close to the LVDS connector that is turn on and supplies the voltage to the T-CON.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Do you see the MOSFET in this picture? How do I test it? Or do I just replace it...?Attached FilesComment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Little 8 pin device near the connector, do you see a part # on it?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
25l3206e
m2i-12gComment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
25l3206e
m2i-12gComment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Hmm, unfortunately not a MOSFET, but a memory for the processor.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
There is another board that goes from the main board to the tcon. See the pic attached here.Attached FilesComment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
That is Motion FRC (="frame rate converter") board for 120Hz/240Hz picture. At the top right 4 pin connector what voltages do you get?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
There is also a bm1084 on the PL MS6M20S 2B board from the last post along with two little 8 pin MP1482DN chips.
The first board I posted a pic of is the the main board with the inputs. The LVDS cable goes from that board to the second smaller board I posted a pic of in my last post. Which is the main board?Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Main board has video inputs like HDMI. Above post has motion FRC and there is also a t-con boardPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
OK, and on the last right 4 red wires going off to the t-con board (coming out from the bottom of that image) do you read 12V?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Nothing on the bottom 4 red wires. The bottom right harness comes from the main board. The left harness goes up to the TCON. I have no voltage on those 4 red wires coming from the main board. I tested those 4 red wires on the main board and have no voltage there as well.
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Hmm, yeah, I looked closely at that board again and the power for the t-con passes straight through the board. Not sure what else to suggest; looks like your main board is bad.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Is it worth trying to reflow the main board or is this going to be a bad MOSFET somewhere?Comment
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Re: 2011 rca 46la55r120q led tv - backlight works, no picture, no sound
Are these two bards interchangeable?
http://******/18AfYp
http://******/18Ag9kO
Same main board number but one is a smaller TVComment
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Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
Hello mates,
I bought this subwoofer a few days ago used and blind and it works erratically, as far as I could see, it has been tampered with, the speaker is not the original one and of 8 Ohm when it should be of 4, and there are some welds like reworked by the boards.
It doesn't have much power (expected more from it) and it distorts if you increase the volume over the middle, maybe it's because of the high impedance of the speaker. The problem is that it has sound when it wants, the led panels all work correctly, you can hear the power relay on power on, but right now... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged... -
Hi all
I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.
Symptom:
No picture no sound.
When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
No sound at all.
What I tried:
1. I tried unplugging the left or right ribbon...
Comment