What is the best way to remove the screen on these borderless set? And what tape to use to resecure screen after replacing backlights? Thanks
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Business card, I use cardboard one for edgeless because it'll allow a 90 bend instead of a stiff card. The foam tears through pretty easy. If you have a suction cup towards the edge of the screen as you slide and gently pull up it works great.
Just go to eBay and type tv foam tape, it'll show up. Generally the foam tape if you grab the very edge you can pull it up in one piece once the screen is off.. if that's the route your going -
Thank you! Will give it a try.Comment
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
Backlight is out. Looks like LCD is double sided foam tape glued to the chassis. Have to cut foam tape with knife/blade?
Apple iMac >= 2012 use foam tape to glue down screen. But impossible to get LCD installed with new foam tape on with same adhesion. Many people have screen fall off and crack afterwards.
Looks like need to get 3M VHB tape to resecure it properly per post #6 here
https://www.badcaps.net/forum/showth...83#post1140983... -
I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered... -
Hello all,
Am trying to figure out this backlight issue with this A1990 Macbook Pro.
Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure...
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