I have a Samsung ln40a500 LCD with a mostly white, inverse picture.
I tried a brand new tcon board but it looked the same. What to try next?
I tried a brand new tcon board but it looked the same. What to try next?
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Re: Samsung inverse picture
Please up load good clear pictures of the screen to show us what you are seeing.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=24809 -
Re: Samsung inverse picture
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Re: Samsung inverse picture
disconnect one ribbon cable that goes from the t-con to the panel at a time and see if you get a clear picture on the half that is connected. reinsert first cable and disconnect other side and check pic again.WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?Comment
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Re: Samsung inverse picture
One panel cable disconn, half screen freezes, goes white. Same if other disconnected.Comment
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Re: Samsung inverse picture
hmmmmmmm. you could check the vgma test points on the t-con to see if it is a gamma issue.
was your replacement t-con new or used?
is the t-con on the lower side of the panel?WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?Comment
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Re: Samsung inverse picture
I would say this is likely a gamma issue.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: Samsung inverse picture
my verdict faulty T-conComment
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Re: Samsung inverse picture
Surely is tcon faulty, if it has an AUO panel is surely AS15 chip, search for "as15" in the forum, tons of threads, tons of chips on market, ebay, aliexpress.Last edited by Davi.p; 09-14-2017, 07:19 AM.Comment
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Re: Samsung inverse picture
Had gotten a new replacement same board tcon from ebay. but it looked the same, even whiter and washed out than original. Im sending that one back.
If its a gamma issue, where is that addressed?Comment
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Re: Samsung inverse picture
I redid the disconnect tcon to panel cables... and got snaps.
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Re: Samsung inverse picture
what's history on the set (ie. how did it get to this "state").Comment
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Re: Samsung inverse picture
TV is a pick from the local electronics recycling site.
so for me its always had the white-washed inversed picture :-)Comment
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Re: Samsung inverse picture
You have luck! (to find it..) It's not unuseful to buy faulty tcon for working or NEW ones! Watch on the tcon, if there's a chip named like AS15-F, take a photo of it closely, i'm curious if someone has made a bad repair. It's better to buy a chip and go in a cellular repair shop asking it to solder it. Ah, usually with faulty as15 it tends to go whiter after you switched on the tv ..Last edited by Davi.p; 09-14-2017, 02:11 PM.Comment
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Re: Samsung inverse picture
Is there anyone related to badcaps community that could replace the tcon as19 chip ? willing to pay around $20-25 (about the cost of another tcon board)
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Re: Samsung inverse picture
let's confirm the fault first.
on the top of the t-con, there are 18 test points within a white outline and gamma written in the middle.
can you measure each point in numerical order and let us know the result.WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?Comment
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Re: Samsung inverse picture
I had asked for a close view of the chip, there i can't see the pins well, but anyway..Comment
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Re: Samsung inverse picture
Here is a closeup of the chip: AS19-H1G
doesnt look modded to me.
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Re: Samsung inverse picture
Here are the requested tcon test point voltages.
01 15.26
02 12.77
03 11.99
04 11.45
05 11.84
06 10.71
07 10.03
08 9.04
09 8.06
10 6.87
11 6.28
12 5.53
13 5.12
14 4.71
15 4.37
16 3.44
17 2.62
DRL1 3.23
OE1 0.78
STV 0.0
CKV 0.0
VSCM 6.81
in this video, I skipped 12, but then corrected myself. above Vs are correct.
https://vimeo.com/234130462Comment
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Re: Samsung inverse picture
Is test point 4 + 5 switched around if it's not then that's tge problem. higher voltage on test point five than test point 4.Comment
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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... -
This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.
Problem
TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode... -
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 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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