Re: Another Samsung HP-T5064, Good Sound, No Picture
That's in circuit right?
That's in circuit right?
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Yeah.Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
You have your answer. The circuit will be likely different for each, resulting in different readings.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
I've got the scope. Where do I take the waveform from?Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
YSUS waveform
https://www.youtube.com/watch?v=hB0mf4-gywAComment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
XSUS waveform
https://www.youtube.com/watch?v=9auaXYXJmR4Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Ugh... that Y-main wave looks really poor. X-main looks ok.
Main thing I don't like about the Y-main wave is that there's no ramp down portion and the ramp up is very distorted. There may be a short and the board is in protect mode. Is an LED lit near the Y-main to control board connector?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
This indicates the board is in protect mode and is limiting the output. There is probably a short on VSCAN or VSET; check both -- those fets you tested earlier can sometimes cause this.
Was that probing at 10X? Looks like only 30Vp-p to me?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Yes the probe was at 10X. I'll pull ysus again and have a look at it.Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Also, try with both buffer boards disconnected.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
The Y test point is on the upper buffer. I don't know where to take the waveform from if I disconnect the buffers.Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Here.Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
ThanksComment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Ysus waveform with buffers removed
https://www.youtube.com/watch?v=4T-rlsz3ztQComment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
Can we get a picture with the timebase at a slower rate, around 2ms/div and 20ms/div, so I can see several fields of the sustain process? Try setting trigger to LINE to get a relatively stable trigger.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
OK, so the only faults appear to be the Vset ramp is stunted and the -Vsc ramp is gone/missing completely. I'd start looking at those Kxxxx FETs as well as the other devices; also, check any test points of those voltages and compare to panel sticker.
For reference, you should see something like this (except there will be more than one Vs pulse and most newer sustains combine the function of -Vy and -Vsetdown into -Vsc.)
http://ars.els-cdn.com/content/image...000735-gr1.gifLast edited by tom66; 03-26-2013, 03:31 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Another Samsung HP-T5064, Good Sound, No Picture
I haven't been able to find any test points for Vset, Vsc, Ve, etc...Comment
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Re: Another Samsung HP-T5064, Good Sound, No Picture
See here for potential test points.Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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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... -
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 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... -
Hello all,
This is my first post, but long term lurker on the form learning as much as possible about these TV's. I was given this TV as due to a power outage of constant On/off of power to TV. The TV originally would just click on and off (Typical Reboot Cycle). I opened the back of the TV, and troubleshooted by taking the 96 pin LVDS off one at a time to see if I had a picture on either side. I finally fixed the reboot cycle by finding the error on the left side of the screen off connector CN 1301, and the TV would stay on. Further troubleshooting led me to the driver boards where...
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