JVC LT-Z37EX6 Service Manual page 21

5.1.6 DETAILS
Self check is performed for the following items:
< Page 1 of screen >
Detection item Display
Low bias line short LOB
protection
Fan lock FAN
Abnormal rise of AUD
temperature in audio
circuit
Devices on the ANALOG ANA
PWB
Devices on the DIGITAL DIG
PWB
< Page 2 of screen >
Detection item Display
Temp. sensor TEM
Lamp does not light up L1
Lamp goes out L2
Abnormal DD CPU DDT
circuit
Fan lock FAN
Lamp cover open LC
Abnormal of optical iris IRS
5.1.7 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.
Type of error
Low bias line short protection
Abnormal rise of temperature in audio circuit
< Explanation of operation >
If error is detected, the power is turned off.
Shortly after a power is turned off, POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.
Detection content
Confirm the operation of the low bais (16V / 5V /
LCD5V / 3.3V / 1.2V) protection circuit.
Q9601, Q9651[DC-DC PWB]
Not used
Confirmation of the temperature of audio circuit.
TH6401 [D-AMP PWB]
Confirmation of reply of ACK signal which uses
2
I C communication.
IC101, IC102, IC381, IC601, IC606,
[ANALOG PWB]
Confirmation of reply of ACK signal which uses
2
I C communication.
IC6401 [DIGITAL PWB]
Detection content
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Blue turnig on and off at 1 second intervals.
Blue turnig on and off at 0.5 second intervals.
Diagnosis
signal (line)
LB_PRO Detection starts 3 seconds after
the power is turned on. If error
continues between 200 ms the
power is turned off.
----
---- Detection starts 3 seconds after
the power is turned on.
If the temperture of 90°C is
detected for 3 seconds the power
is turned off.
SDA If
communication is performed and
TU3001 no reply of ACK signal an error
will be counted.
SDA If
communication is performed and
no reply of ACK signal an error
will be counted.
Diagnosis
signal (line)
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POWER LED flash cycle
Detection timing
----
2
it checks whenever I C
2
it checks whenever I C
Detection timing
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(No.YA462)1-21