Hi all,This is my second post, and I have a general LCD monitor related question, so I am starting here and would receive instruction as to a better place to post. I am replacing the CCFL lamps in a Sceptre X22wg-1080p, and I may have changed the film layers by mistake. The bottommost layer is a reflective white sheet, then comes the Glass light guide with an etched grid on one side- and I need to know which way that etched surface goes, towards the bottom or the top, then I need the order of the two Prism Sheets (V and H), if there is a top or bottom orientation, if it makes a difference. Finally the same with the protector sheet on top of the others and below the lcd panel. I don't wanna put the thing together and have to take it apart again to turn things around. Thanks
-
-
Re: What is the order and orientation of LCD panel layers?
Backlight---White Sheet---Light Guide---Polarizer---LC Panel---Polarizer---Glass is all I know. -
Re: What is the order and orientation of LCD panel layers?
After watching a number of youtube videos where the LCD panel is taken apart piece by piece and measuring the metal frame securing guide pins on my monitor, I have found out that the up-down/ right-left orientation of all the sheets is fixed, so you can't disorient each sheet itself. But you can change the order of the sheets. On some videos the sheets seem to go one way, on others, the other. In this monitor, a Sceptre x22wg-1080p, the innermost sheet is a white, opaque reflective sheet, then comes the thick light guide glass with the CCFL lamps along its sides, with the etched dot pattern on the glass facing the white sheet side (the glass cannot be oriented any other way), then there are three more thin plastic sheets between the LCD panel and the glass. I put the sheet that seems to be more opaque- kind of a gray frosting next to the glass, then the sheet that seems to magnify and is most transparent, then the sheet which is less opaque than the other gray frosted one. I don't think that any of the three sheets have to do with polarization as turning them against each other produces no change in light transmission, so they must be diffuser sheets. One of the gray sheets is likely a protective sheet, probably the topmost one, so I hope I have the correct ordering. Of course the LCD panel and circuitry goes on top. Thanks to Cheapie for his post. https://www.badcaps.net/forum/images/smilies/compy.gifLast edited by TCI; 04-01-2013, 05:07 PM.Comment
-
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.... -
Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
I am trying to repair my monitor that shows image but the backlight is not turning on. I think either the power supply is not working properly or the LED strip is failing, which seems unlikely (the whole strip is off).
I really need help in finding the data sheets for this monitor's boards. The data sheets I need are for the following boards:
Power Supply: 715GA907-P03-000-001S and 715GA721-P01-000-0H4K
Main Board: 715G9500-M0C-B00-005K
T-CON Board: 19Y_270_EU3MQ_SR_V02_HF
If someone could please provide any of these data sheets, it would be awesome....05-31-2025, 11:12 AM -
Hello all, new member here. I replaced the LED strips and found that the BL can be turned on with the TCON board and LCD panel disconnected. So new LED strips are working fine. Now the problem. There are 3 diffuser sheets on this set. One sheet is thicker than the others and I know it goes in first next to the LED strips. But one side of this sheet has a rougher texture than the other side. Does the rough side go up or down? The 2 thinner sheets have tabs that will only allow them to be installed one way so that's good. One sheet is what I would call plain translucent. The other sheet is whiter... -
Can you clean the internal sheets of a tv? I have a 58-inch TV and I don't know if it's worth cleaning the sheets. I have seen that it has dirt on the sheets and the leds are blown. I don't know if they look good when you clean the sheets. Thanks in advance.
Comment