JVC LT-52GZ79 Service Manual page 21

5.1.6 DETAILS
Self check is performed for the following items: (---- is not used items)
<Page 1 of screen>
Detection item Display
Low bias line short
protection
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Devices on the ANALOG
PWB
Devices on the DIGITAL
PWB
<Page 2 of screen>
Detection item Display
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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
<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
LOB Confirm the operation of the low bias protection
circuit.
IC9401, Q9401, Q9601,
FAN
AUD
ANA Confirmation of reply of ACK signal which uses
I 2 C communication.
IC101, IC102, IC601,
[ANALOG PWB]
DIG Confirmation of reply of ACK signal which uses
I C communication.
2
IC5001 [DIGITAL PWB]
Detection content
TMP
L1
L2
DDT
FAN
LC
IRS
Diagnosis
signal (line)
LB_PRO
Q9703 [DC-DC PWB]
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SDA
IC3501, TU3001
SDA
Diagnosis
signal (line)
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POWER LED flash cycle
POWER LED turnig on and off at 1 second intervals.
Detection timing
Detection starts 3 seconds after
the power is turned on. If error
continues between 200 ms the
power is turned off.
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Detection starts 3 seconds after
the power is turned on. If it checks
whenever I C communication is
2
performed and no reply of ACK
signal an error will be counted.
Detection starts 3 seconds after
the power is turned on. If it checks
whenever I 2 C communication is
performed and no reply of ACK
signal an error will be counted.
Detection timing
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(No.YA665<Rev.001>)1-21