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NX-800/800H
42
TROUBLE SHOOTING
● When an error display appears on the LCD.
The LCD displays “INIT ERROR1”.
An error occurs when the ASIC internal RAM reads
or writes. The ASIC may be broken.
The LCD displays “INIT ERROR2”.
An error occurs when the DSP internal RAM reads
or writes. The DSP may be broken.
The LCD displays “INIT ERROR3”.
An error occurs when the SRAM internal RAM
reads or writes. The SRAM may be broken.
● Checking the signal output from
the ASIC by software control
● Panel control (TX-RX unit)
It is unlikely that the BGA parts are broken.
Points to be checked Normal voltage
/PRST R506 (Signal side) 3.3V
Points to be checked Normal voltage
SBC R408 3.3V
Points to be checked Normal voltage
80C C581 (Signal side) 8.0V
If the SBC is 3.3V and 80C regulator IC403 (pin 1)
input side is 8.5V or more, the BGA parts are not broken.
Remove the Q501. If the ASIC side is 0V,
the ASIC/FALSH/SRAM may be broken.
Remove R408. If the ASIC side is 0V,
the ASIC/FALSH/SRAM may be broken.
● Panel control (Panel unit)
Checking voltage
Points to be checked Normal voltage
5C IC903 (5 pin) 5.0V
33C IC904 (5 pin) 3.3V
Checking the clock/reset
Points to be checked Normal voltage
Xout R949 11.059MHz (5.0V)
/PRST R947 (Signal side) 5.0V
FLASH R986 3.3V
The BGA parts are not broken.
Checking the Control signal
Points to be checked Normal voltage
/CS0 IC911 (48 pin) 3.3V→0V→3.3V
/RD IC911 (42 pin) 3.3V→0V→3.3V
Checking the Control signal
Points to be checked Normal voltage
/LCDRST R991 (Signal side) 3.3V
/CS3 IC912 (7 pin) 3.3V→0V→3.3V
If nothing is displayed even after replacing the panel,
the BGA may be broken.
The panel microcomputer receives a request of LCD
display from the ASIC. Then, the LCD displays.
The /LCDRST and /CS3 signal become abnormal if
communication is disabled due to a trouble in
the ASIC.
Points to be checked Normal voltage
/DRST R841 3.3V
If the /DRST is 0V, the ASIC/FALSH/SRAM are broken.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When a normal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.
When an abnormal
value is confirmed.