Key Board Section - LG 32LD350 Troubleshooting Manual

KEY BOARD SECTION

KEY BOARD SECTION
The Key board is routed to the IR board from P3000 to J3 and output on J1 Key 1 and Key 2 lines. The Key board is routed to the IR board from P3000 to J3 and output on J1 Key 1 and Key 2 lines.
Arriving at P2401 pins 4 and 5 on the Main Board.
Then to the Microprocessor Pins A4 and B4.
On P3000 (Key 1 is pin 1 and Key 2 is pin 3), Pins 2 and 4 are ground.
Label
Key 1
Label
Key 2
p/n: EBR65863602
Key 1 / 2 Voltage and Resistance Chart with buttons pressed.
Function
ey Vol + o
Vol -
Menu
Enter
Function
CH +
CH -
Power
Input
Key Board
Resistance Voltage
17M 1.70V 0
10M 1.09V
5.27M 0.52V
0.98M 0.10V
Resistance Voltage
17M 1.70V
10M 1.09V
5.27M 0.52V
0.98M 0.10V
65
Voltage and Resistance taken
with AC applied to the set.
No Button pressed Resistance N B tt d R
is Open and Voltage is 3.4V.
Diode Check on Key 1 and Key
2 is Open. p
Voltage with no key pressed
3.4V STBY and 3.39V RUN
November LCD TV 32LD350
i t