JVC LT-42P789/C
LCD TV
SERVICE MODE AND POWER SUPPLY CIRCUIT
SERVICE MODE
HOW TO ENTER THE SERVICE MODE
(1) Set to "OFF" using the [SLEEP] key.
(2) While "OFF" is displayed, press the [V. STATUS] key and [DISPLAY] key simultaneously.
(3) Enter the SERVICE MODE
HOW TO ENTER THE SERVICE MODE
(1) Set to "OFF" using the [SLEEP] key.
(2) While "OFF" is displayed, press the [V. STATUS] key and [DISPLAY] key simultaneously.
(3) Enter the SERVICE MODE
(4) Select the
2.White balance base from the SERVICE MODE.
HOW TO EXIT THE
SERVICE MODE
Press the [MENU] key to exit the SERVICE MODE
Press the [MENU] key to exit the SERVICE MODE
POWER SUPPLY CIRCUIT
CLICK ON THE IMAGES TO ZOOM IN
SELF CHECK FUNCTIONS
OUTLINE
This model has a self check function given below. When an abnormality has been detected, the power is turned off and the POWER LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.
OUTLINE
This model has a self check function given below. When an abnormality has been detected, the power is turned off and the POWER LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcomputer.
Detection item
|
Detection content
|
Diagnosis signal (line)
|
Detection timing
|
Low bias line
short protection |
Confirm the operation of the low bias (3.3V/5V/
12V/24V) protection circuit. 3.3V: Q7004 [SIGNAL PWB] 5V: Q7003 [SIGNAL PWB] 12V: Q7001 [SIGNAL PWB] 24V: IC7019 [SIGNAL PWB] |
LB_PRO
|
At 10 seconds after the power is
turned on, the
self-check function starts. If NG is detected during 3000ms, the power is turned off automatically. |
METHOD OF DISPLAY
WHEN A RASTER IS NOT OUTPUT
In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.
Low bias line short
protection ------------------LED turning on and off at 2 seconds intervals.
If an error is
detected, the power is turned off. Shortly after the power is turned off, the POWER LED will be blinked. Power cannot be turned on until the power cord takes out and inserts, after the
power is turned off.
