Haven't got this one in my possession yet but was sent a picture of this faulty 3 year old Sammy. Best guess?? Bad panel?? Timing control board??
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Re: 42 Samsung LCD, this has gotta be a bad panel?? PIC:
I say panel. Does it change if you flex the panel?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: 42 Samsung LCD, this has gotta be a bad panel?? PIC:
Not sure bud, don't have the tv in front me, was just sent the photo of what it's doing. My guess was Panel too but I wanted to check in with the pros here firstComment
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- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.
tcon is built into mainboard.
Only one cable goes to panel boards.
there is a cable from one panel board to the other that links them.
cost cutting measure that results in us having harder time to diagnose.
removing the link to the second panel board allows TV to stay on with stable backlight but no image.
used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board.... -
I came across a 50inch TU8000 that wouldnt start up properly (blinking stand-by light, backlights would cycle on and off).
When i opened it up and removed the power to the mainboard the backlights powered up and everything looked uniform.
When reconnected the mainboard but disconnected the flex cable to the panel i heard the TV startup with the intro sound.
Later I checked for shorts on the panel PCB boards but could not find anything.
When I took a look with the FLIR i noticed the 2 resistors... -
Hello,
I was given this Samsung GU50TU8079U that would power cycle after a couple seconds, sometimes a few minutes. The screen would turned cloudy dark with the backlight still lit and then the sytem would restart.
Its one of the newer screwless Samsung models that I read a lot about panel failures here. It does not have a sperate T-CON board, just one ribon from the mainboard to the panel board and a U-shaped ribbon cable connecting the other half.
I went through the usual diagnostics:
unplugged the mainboard -> tv stayed on
removed the U-Shape robbon ->...
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