LCD Screen Inverter's Pin Assignment Definition
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LCD screen inverter has 4 functions:
VIN=Input Voltage. (Typically 12V DC)
GND=Power Ground.
Enable=to turn the inverter on and off by Logic Board (Main board)
ADJ=Dimming control. Adjusting the brightness Level on LCD screen
Identify the pin Assignment is quiet easy:
First Identify Input Pin and Voltage.
Second Identify Second Identify Power Ground.
Then re-wire your defective Pin Assignment to our universal inverter.
Turn on your display, if there is no display, please reverse ADJ and Enable pin.
cture disappear while adjusting brightness, please reverse ADJ and Enable pin.
So, the next few sections, we just show you how to identify Input DC Voltage Pin and Power Ground.
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There are two methods to identify the Pin assignments for Input DC Voltage Pin and Power Gound Pin
Vision Inspection
Multimeter Inspection
Vision Inspection:
Some manufacturer do label the pin assignments on PCB (Printed Circuit Board),
So, Please take a closed look on your inverter’ Input connector.
Here are some of pin assignment pin definitions:
VIN=Input Voltage
GND=Power Ground
ENA=Enable or On/Off
ADJ=Dimming Control
NC=Not Connect
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Multimeter Inspection:
Identify the Input pin and Power Ground pin by locating a Capacitor on the inverter:
All of inverter has an input filter capacitor (Typically for Desktop monitor and LCD TV Inverter). The positive pin is connecting to Input voltage supply and the negative pin is connector power ground.
Set your Multimeter on Resistor range.
Measure the resistance between the positive pin(Capacitor) and Input Connector Pins. The DC Volt Input pin should show 0 hom resistence.
Measure the resistance between Input Connector Pins and Metal chassis. The power gound pin should show 0 hom resistence.
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Identify the Input pin and Power Ground pin by locating a SMD Fuser on the inverter
For Laptop or other small and compact size inverters, it would be much easier for you to
locate a SMD Fuse in stead of Capacitor(Photo shown below).
Set your Multimeter on Resistor range
Measure the resistance between the SMD Fuse and Input Connector Pins. The power gound pin should show 0 hom resistence.
The power ground is usually has a large solder pad on the solder side, so,
locate the solder pad, measure the resistance (R=0 ohm) between the large solder pad and Input Connector’s Pin to fidn which are Power Gorund Pin.
Or you can Connect the black probe to metal chassis on the LCD display. Measure the resistance between Input Connector Pins and Metal chassis. The power gound pin should show 0 hom resistence
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LST01
No more guess works!
LST01 is a custom build tester for Laptop screen repair;
it can help you to isolate the problem between CCFL Backlight Lamp and Inverter in seconds.
Save Time! Save money!
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LST02
It has all LST01’s features, plus a built–in LCD Controller
that equips with our proprietary driver. It allows you to apply any
test pattern through VGA input and test all types of specification on the LCD
and LED Screen. In addition, a custom design Inverter allows you
to test any given number of CCFL back light lamp up to 4 at the time. |
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IT01
IT01 is design to test multiple backlight lamps inverter;
it is capable to test any type of inverter up to 6 lamps at the time!
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IT02
Stand alone Inverter tester!
The advantage of this custom build tester is that, you can apply any input voltage
through DC Jack to test inverter from Laptop to LCD TV inverter.
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