JVC AV-48P776/H, Руководство по обслуживанию, Страница: 54 / 154

(No.YA318)1-53
5.1.6 DETAILS
SELF CHECK is performed for the following items:
5.1.7 DISPLAY METHOD WHEN RASTER IS NOT AVAILABLE
The self check results are shown on the following LED display.
Method of indication when the raster is not displayed.
Each failure is shown by turning LED on and off at the specified
intervals.
• For B1 over-current protection, CRT neck protection and Low
B short protection, the power of the TV is turned off, if NG is
detected. Immediately after the power is turned off, POWER
LED will be turning on and off. When the power is turned off,
you cannot turn the power on again until the AC plug is taken
out and put in again.
Check Item Indication Details of detection Method of detection
X-ray protection XRAY Operation of X-ray protection circuit.
Q1853 [MAIN PWB]
At about 3 seconds after the power is turned on, the self-
check function starts.
If NG is detected for 200ms, POWER LED is turned on and off.
B1 over-current
protection OCP B1 over-current is detected.
Q971 [DEF & CONVERGENCE OUT PWB]
At about 3 seconds after the power is turned on, the self-check
function starts.
If NG is detected for 200ms, the power is turned off automatically.
Low B short protection LOB Operation of low B short protection circuit.
5V:
Q1961
9V: Q1962 [MAIN PWB]
At about 3 seconds after the power is turned on, the self-check
function starts.
If NG is detected for 200ms, the power is turned off automatically.
CRT neck protection Operation of CRT neck protection circuit.
Q402 [DEF & CONVERGENCE OUT PWB]
At about 3 seconds after the power is turned on, the self-check
function starts.
If NG is detected for 1.5s, the power is turned off automatically.
Timer (clock) TIM The power frequency is changed as follows:
50Hz
→
60Hz / 60Hz
→
50Hz
I C1701 [MAIN PWB]
Periodically check the power frequency by counting the AC
pulse and monitor whether or not the frequency is changed
except for the time immediately after resetting.
Presence or absence
of synchronized
signal SYNC Presence of synchronized signal.
HD: Component input / M: NTSC main / S: NTSC sub
IC1301 [MAIN PWB]
When entering the self-check mode, "OK" is shown.
While running the mode with picture signal, if the
synchronized signal is disappeared, "NG" is shown.
Main memory MEM ACK is returned when I
2
C traffic is carried out.
IC1803 (memory) [MAIN PWB]
The state is monitored every time when I
2
C traffic is carried out.
Then the state is counted as a failure if ACK is not returned.
AV switch AVSW Ditto
IC1501 and IC1801 [MAIN PWB]
Ditto
Video process VCD Ditto
IC1301 [MAIN PWB]
Ditto
Audio process AIO Ditto
IC1140 [MAIN PWB]
Ditto
3D YC separation YC Ditto
IC3101 [DIGITAL SIGNAL PWB]
Ditto
RF tuner TUN Ditto
TU1101 [MAIN PWB]
Ditto
Multi screen PP Not used ---
DIST process IP ACK is returned when I
2
C traffic is carried out.
IC3001 [DIGITAL SIGNAL PWB]
The state is monitored every time when I
2
C traffic is carried out.
Then the state is counted as a failure if ACK is not returned.
Digital input process HDMI Ditto Ditto
Split protection SPRT Not used ---
Item POWER LED ON / OFF intervals
X-ray protection
Turning on and off at 0.1-second intervals
B1 over-current protection Turning on and off at 1-second intervals
Low B short protection Turning on and off at 2-second intervals
CRT neck protection Turning on and off at 3-second intervals