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5.1.6 DETAILS
Self-check is performed for the following items.
Check item
Display
LOB
Low bias line short
protection
Fan lock (stop)
FAN
AC timer clock
TIM
SYNC
Presence of sync signal
MAIN CPU
MSM
communication
Digital tuner
DIGI
Memory for chassis CPU MEM
AV switch
AVSW
YC
3D YC separation
AIO
Audio process
RF tuner
TUN
Ghost reduction
GCR
DIST process
IP
RGB process
RGB
DVI transmission
DVI
Digital input receive
HDMI
Description of detection
Low bias line (9V / 5V) short protector
activated.
Confirm the operation of the low bais
protection circuit.
[Q2802 /Q2801] (REGULATOR PWB)
Confirmation of operating stop of heat
cooling fan.
[IC8005 : 1 / 2 / 4 / 5-pin]
(FAN CONTROL PWB)
Not used
Confirmation of presence of video sync
signal.
M : Main sync signal
S : Sub sync signal
HD : Component sync signal
[IC201] (ANALOG SIGNAL PWB)
Confirmation of ACK (response) signal
which used sync communications with
Chassis CPU.
[IC7601] (DIGITAL SIGNAL PWB)
Not used
Confirmation of reply of ACK signal which
2
used I
C communication.
[IC7602] (DIGITAL SIGNAL PWB)
Same as above
[IC501] (ANALOG SIGNAL PWB)
Same as above
[IC1001] (DIGITAL SIGNAL PWB)
Same as above
[IC1140] (RECEIVER PWB)
Same as above
[TU1101] (RECEIVER PWB)
Not used
Confirmation of reply of ACK signal which
2
used I
C communication.
[IC3001] (DIGITAL SIGNAL PWB)
Same as above
[IC4001] ((DIGITAL SIGNAL PWB)
Not used
Confirmation of reply of ACK signal which
2
used I
C communication.
[IC8001] (DIGITAL SIGNAL PWB)
Diagnosis
Means of detection
signal (line)
Protector
Detection starts 3 seconds upon power
on Turns off power if NG is detected
within 400ms.
Protector
Detection starts 3 seconds upon power
on Turns off power if NG is detected
within 250ms.
---
---
SDA
Confirmation of presence of video sync
signal.
WAKE
If it checks whenever sync
communication with SHM performed and
no reply of ACK signal an error will be
counted.
---
---
If checks whenever I
SDA
is performed and no reply of ACK signal
an error will be counted.
SDA
Same as above
---
---
SDA
If checks whenever I
is performed and no reply of ACK signal
an error will be counted.
---
---
SDA
If checks whenever I
performed and no reply of ACK signal
an error will be counted.
2
C communication
2
C communication
2
communication is
(No.YA092B)1-35
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