JVC LT-26X506/S Service Manual page 7

2.3.1.2 PIXEL FAULT
There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.
BRIGHT FAULT
In this pixel fault, a cell that should not light originally is lighting on and off.
For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.
DARK FAULT
In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.
For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.
FLICKER FAULT
In the pixel fault, a cell that should light originally or not light originally is flashing on and off.
For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on
and off.
2.3.2 MAIN CPU PIN FUNCTION [U302 : MAIN PWB]
Pin Pin name I/O
1 HP-VOL O Headphone Volume control (pwm)
2 PWR-LED-B O POWER INDICATER CONTROL "HIGH"
3 PWR-LED-D O POWER INDICATER CONTROL "LOW"
4 VSS - GND
5 XIN I 32.768KHz for system clock (deviding to10MHz)
6 XOUT O 32.768KHz for system clock (deviding to10MHz)
7 VDD I 5V
8 NC - Not Use
9 TV-PWR O Main Power Control
10 AFT I Auto Fine Tuning Voltage input
11 KEY1 I key scan data 1
12 KEY2 I key scan data 2
13 RESET I RESET
14 FILTER O Cllosed Caption-filter
15 CVIN I CVBS for Cllosed Caption data slice
16 NC - Not Use
17 VS I Vertical sync
18 HD I Horizontal sync
19 R O R for closed caption
20 G O G for closed caption
21 B O B for closed caption
22 BL O BLANKING for closed caption
23 AV-RST O Reset for inter IC
24 NC - Not Use
25 IIC DATA I/O I2C bus Data(for inter IC)
Function Pin Pin name I/O
24 NC - Not Use
25 IIC DATA I/O I2C bus Data(for inter IC)
26 IIC CLOCK I/O I2C bus Clock(for inter IC)
27 PGEN O 6WIRE bus Enable(for MTL013)
28 PGCLK O 6WIRE bus Clock(for MTL013)
29 THERMAL I heat watch
30 LVDS-PWR - Not Use
31 SYNC-IN I Horizontal sync(for sync detect)
32 RMT-IN I Remote control
33 NC - Not Use
34 DATA1 I Enable for on boad flash CPU writer
35 S1-TIN1 I video1 s1 terminal input detect
36 S1-TIN2 I video2 s1 terminal input detect
37 D-TIN I video1 component terminal input detect
38 PG0 I/O 6WIRE bus data0(for MTL013)
39 PG1 I/O 6WIRE bus data1(for MTL013)
40 PG2 I/O 6WIRE bus data2(for MTL013)
41 PG3 I/O 6WIRE bus data3(for MTL013)
42 NC - Not Use
43 HP-DET O Headphone terminal input detect
44 CCFL O LAMP power control
45 PNL-PWR O LCD panel power control
46 D-DIMMER O Pwm dimming control1(for LAMP)
47 A-DIMMER O Pwm dimming control2(for LAMP)
48 NC - Not Use
Function
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