- 52 -
RS232 link fail
Check U28 pin20 is high?
Check signal MCU_RX and
MCU_TX is normal
Check J22 pin RX and TX
is normal ?
No
Check U28 pin19 is high?
Yes
No
Yes
Yes
No
No
Check cable or trace
Check control pin RS232_SHDN status
(default high)
1. Check control pin RS232_TXEN
status (default high)
2. Check R213 or R214 is mounted?
Check U28 soldering or to change a new
chip
CVBS or S-video repeat output no signal
Check U1 or U2 operation normal?
VGA repeat output no signal
Check U5 operation normal?
DVI or HDMI picture display abnormal
Check C96 is mounted ?(N.C. is normal)
IR function fail
Check cable or change another IR board
Detect ambient light function fail
Check cable or change another IR board
Scheduling function fail
Check Y4 waveform or U35 is operation
normal
DVI repeat output no signal
Check U21 operation normal?
Summary of Contents for DV650C
Page 15: ... 15 3 4 2 OSD Table Generic for Version 2 4 1 ...
Page 21: ... 21 3 5 Packing ...
Page 22: ... 22 4 Disassembly Assembly 4 1 Exploded View ...
Page 46: ... 46 5 4 OSD Operation Guide ...
Page 47: ... 47 ...
Page 65: ... 65 Appendix 3 I F Board ...
Page 66: ... 66 ...
Page 67: ... 67 ...
Page 68: ... 68 ...
Page 69: ... 69 ...
Page 70: ... 70 ...
Page 71: ... 71 ...