![]() ![]() Worth noting here, at least from my experience, is that these (usually linear) supplies rarely fail. So depending on its requirements, you may see up to 3 more dedicated voltage regulators (typically linear ones, like 1117 or 1084) near that chip. Usually, the "big chip" on the T-con is what decodes the LVDS signals from the main board, and this chip may require 1.8V, 2.5V, or 3.3V (or a combination of these). It is used for driving transistors Off in the TFT panel.Īpart from the 4 voltages / power supplies on the T-con mentioned above, there may be a few more for various other functions. ![]() VGL is a negative rail usually in the range of -5 to -10V. Many T-con board often refer to them as "VGH" and "VGL" (though sometimes also "VG_ON" and "VG_OFF".) VGH is typically +15 to +32V depending on the monitor, and is what is used to turn "On" the transistors in the TFT panel. The 3rd and 4th voltages are generated from "AVDD" mentioned above via charge-pump method. You will find this rail usually near a round inductor and a large diode. Most T-con boards call it "AVDD", but again, the notation may vary. The second voltage is generated (through a boost regulator) from the first/main voltage above and is typically in the range of 10 to 15V. The first/main voltage is typically a 3.3V to 5V supply from the main board (sometimes called "Vcc", "Vdd", "3V3", or "5V1" on test points - the notation varies between monitors and is not consistent.) This is what connects to your "F1" fuse and powers everything else on the T-con. contains internal power supplies) that are used for driving the TFT, along with powering the drivers and LVDS transcoder IC. The T-con board generates several voltages (i.e. So let's get you on the right foot with some basics on that. ![]() ![]() Since you already more or less eliminated the LVDS connector as the problem, that leave the T-con board power supplies. White screen issue typically means either LVDS connection problem or T-con board power supply problem. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |