JVC AV-34WP84 /ZA Service Manual page 50

5.1.6 SELF-DIAGNOSIS DETAILS
Indication Check Item
XRAY X-ray protection
OCP B1 over-current
protection
LOB Low B protection
LOB CRT neck protection Operation of CRT neck protection circuit.
TIM Timer (clock)
MEM Main memory
AVSW AV switch
VCD Video process
AIO Audio
YC 3D YC separation
TUN RF tuner
PP Multi screen
IP DIST process
HDMI DVI (Digital input)
process
SYNC Presence or absence
of synchronized
signal
5.1.7 SELF CHECK DISPLAY BY LED
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 protection, the power of the TV is turned off, if NG is detect-
ed. 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.
1-50 (No.52170)
Details of detection
------
B1 over-current is detected.
Q2971 (POWER & DEF PWB)
Operation of low B protection circuit.
5V: Q1961, 9V: Q1962 (MAIN PWB)
Q2401 (POWER & DEF PWB)
The power frequency is changed as follows:
→ →
50Hz 60Hz / 60Hz 50Hz
IC1701:pin 17 (MI-COM & DIST MODULE
PWB)
ACK is returned when I2C traffic is carried out.
IC1703 (memory) (MAIN PWB)
Ditto
IC1501 (MAIN PWB)
Ditto
IC1301 (MAIN PWB)
Ditto
IC0201 (RECEIVER PWB)
Ditto
IC3001 (MAIN PWB)
Ditto
MAIN: TU0102 (RECEIVER PWB)
SUB: TU1101 (MAIN PWB)
Ditto
IC1001 (MI-COM & DIST MODULE PWB)
Ditto
IC1001 (MI-COM & DIST MODULE PWB)
Ditto
IC7001 (DIGITAL INPUT MODULE PWB)
Presence of synchronized signal.
HD: HD system / M: NTSC main / S: NTSC sub
IC1301 (AN15394A) : (MI-COM & DIST
MODULE PWB)
Method of detection
------
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.
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.
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.
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.
The state is monitored every time when I2C traffic is carried out.
Then the state is counted as a failure if ACK is not returned.
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
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.
Item
B1 over-current protection Tumingon and off at 1-second intervals
Low B protection Tumingon and off at 2-second intervals
CRT neck protection Tumingon and off at 3-second intervals
POWER LED ON / OFF intervals