The “Low Voltage Differential Signaling” (LVDS) circuit differential is responsible for transmitting or “Signaling various signals between the flat video cable and the screen.
It is a very simple circuit to be analyzed because the names of the signals are quite universal, that is, practically every project works similarly.
IMPORTANT:
Some signals in the schematic diagram have a "#" on the front, indicating that that signal will be activated when it is at 0V.
Example.: BKOFF# = when at 0V the screen does not turn on the backlight. However, when you have 3V the screen will work normally.
Some examples of LVDS signals:
- Control of screen brightness (DAC_BRIG)
- Lighting of the screen led (BKOFF #, DISPOFF#, BLON)
VDS Circuit Analysis:
Photo shows the JLVDS connector (where the flat cable is attached to the motherboard).
It was circulated in red and marked in yellow only the important signals that must be found in this circuit for it to function normally and display an image on the screen.
See that the signals INV_PWM, BKOFF#, DAC_BRIG and + LCDVDD must be 3v for the circuit to work.
The INVPWR_B+ signal is the main supply of the connector, called HIGH, that is, where there must be 19v.
It is a very simple circuit to be analyzed because the names of the signals are quite universal, that is, practically every project works similarly.
IMPORTANT:
Some signals in the schematic diagram have a "#" on the front, indicating that that signal will be activated when it is at 0V.
Example.: BKOFF# = when at 0V the screen does not turn on the backlight. However, when you have 3V the screen will work normally.
Some examples of LVDS signals:
- Control of screen brightness (DAC_BRIG)
- Lighting of the screen led (BKOFF #, DISPOFF#, BLON)
VDS Circuit Analysis:
Photo shows the JLVDS connector (where the flat cable is attached to the motherboard).
It was circulated in red and marked in yellow only the important signals that must be found in this circuit for it to function normally and display an image on the screen.
See that the signals INV_PWM, BKOFF#, DAC_BRIG and + LCDVDD must be 3v for the circuit to work.
The INVPWR_B+ signal is the main supply of the connector, called HIGH, that is, where there must be 19v.
