I bought this TV years ago and it never gave any trouble until just a few weeks ago. It's probably just a coincidence, but it only started after the TV was moved to an upstairs bedroom (No, I didn't drop it ;-P). Anyway, the problem started out as intermittent and now seems to be continuous. I'll describe it as best I can and refer to some pics I took. The picture now appears very bright and the black level looks greenish instead of black. The picture also looks oversaturated and has very high contrast. I was afraid of burning out the lamp or display, so I quit using it. I took the back off the unit the other day and did a visual inspection. I cannot see any bulging caps or cracked solder joints, nor can I see anything that looks as though it might have overheated or leaked. I have yet to check components or any voltage levels with my multimeter. Because of the preponderance of bad caps around these days, I originally thought it might have been something on the PS board that was sending an overvoltage to the display. But now I am not so sure. The pictures were taken of a DVD image on pause (over-the-air transmissions exhibit the same symptoms). The first picture is from our 60” LG which is working fine. The second shows the same image on the 32” Samsung. The third picture is a close-up of the same Samsung image showing the greenish “black” background and what appear to be dead pixels but really aren't. Any suggestions as to what could be causing this and where to start looking?
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Samsung LNT3242H with display issues
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Re: Samsung LNT3242H with display issues
First I would check LVDS cable is properly seated; this is internal to the unit, running between the main board and T-con board. If it is, I would then ask for a picture of the T-con as there is a common fault called a "gamma reference fault" which can sometimes cause this problem.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.
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Re: Samsung LNT3242H with display issues
It looks like GAMMA voltage problem on the T-CON board. What does the pictures like with pictures that has more lighter back ground?
If your TV uses this T-CON board, it does have the famous AS15 GAMMA ICs that are failing like flies.
http://www.shopjimmy.com/media/catal...bn8101868a.jpgNever 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
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Re: Samsung LNT3242H with display issues
OK, here's where I'm at now. The LVDS cable was removed from the signal processor side yesterday when I did a visual of that board and I don't see a connector issue on that side. I located the T-con board at the top of the TV and removed the LVDS cable from the T-con side. Looked fine. I also removed two ribbon cables at the top of the board. Those look fine as well. I removed the board and did a visual inspection which told me nothing new. Is this the board that has issues? (see pic). If I still need to shoot a pic of the screen with a whiter background, I'll have to reassemble everything first. Just let me know.
p.s. Thanks guys for a prompt reply to this.
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Re: Samsung LNT3242H with display issues
See those small square copper pads on the T-CON board with GMxx? Take the DC Voltage readings, black probe on the chassis.
By CN1 you can see GM1, GM2, GM3, GM4.
By CN2 you can see GM5~GM14.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
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Re: Samsung LNT3242H with display issues
OK, I reinstalled the T-con board (without metal cover) and took the GM1-GM14 voltage readings (Fluke DMM). This was with an image on the TV that was whiter than the previous pics. Here's what I got:
GM1 13.06 VDC
GM2 10.66 VDC
GM3 11.84 VDC
GM4 11.98 VDC
GM5 8.98 VDC
GM6 7.53 VDC
GM7 7.07 VDC
GM8 10.29 VDC
GM9 6.512 VDC
GM10 5.07 VDC
GM11 4.526 VDC
GM12 3.818 VDC
GM13 3.028 VDC
GM14 0.008 VDC
It's getting late so I'll check back tomorrow sometime to see your response. Thanks again.
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Re: Samsung LNT3242H with display issues
The voltages are bad. You need new T-CON board.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
Comment
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Re: Samsung LNT3242H with display issues
Did you try shopjimmy.com?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
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Re: Samsung LNT3242H with display issues
I have a Samsung LN-T3242H, I'm wondering if the t-con replacement would fix the problem I'm having. There is 'shadowing' over the center (similar to the initial poster's center picture), it's getting a little dark on one edge (kinda spotty) and a 'ghosty' lighter vertical line, about 3" wide on the opposite side of the screen. I'd post a picture but, I'm new here so I can't! Any input will be greatly appreciated!
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