12
Technical Manual
AV3 Signalprocessing
CVBS/YUV Audio in
YUV
GND
5V Standby
IRRCVR (Sensor)
RDLED (red LED)
GRLED (green LED)
GND
30V Audio
5V Standby
GND
5V
5V
12V
STBY (start low voltage)
DPMS (start high voltage)
VRR (PD Pready)
Digital Output
1,5,7
2
3
4
6
1,2
3,4
1
2,4,6
3
5
7
8
9
10
1-50
Connector
CN 15
CN 6 -A/-B/-C
CN 21
CN 11
CN 13
CN 33
Pin
Marking
6.4
Fault finding
6.4.1
Without opening the unit
— Analysis Front LEDs
Red LED remains lit in spite of switching unit on with remote: device stays in standby, possible faults are IR
remote control or AV3..
Green LED but no picture: device is active but shows no image, possible faults are: wrong input source
selectedor panel defective.
Red and green LED is lit at the same time: unit is in an undefined state, fault caused mostly by AV3
— Analysis Screen
If with a black screen (no image is displayed) a light gleam is still visible (darken point of view with hand),
normally the problem is located in the signal routing and not on the panel itself.
.
— Accoustic Analysis (Relais)
When switching between the different input sources, there is a gentle click of a relais to be heard. If this is not
audible, the problem is certainly located on the AV3.
6.4.2
With open unit
— Check supply voltages (use the pins of the connectors for testing points,
(see chapter 6.3 on 11)
.
— Problem containment (by means of checking and / or exchange of single PCB’s)..
6.4.3
FAQs
Noisy picture in tuner mode
— Signal level must be higher than 68db
µ
V (typical level of cable TV)
— High noise level on RF signal (poor SNR)
— Adjust DNC to max. (OSD)
— Due to the digital signal processing flat panels are more sensitive to noise levels than 50Hz interlace CRTs
or 50Hz progressive CRTs (8Bit resolution, False Contouring, Dithering, Deinterlacing, limits of the used PDPs,
...)
Noisy picture in Video mode
— High noise level on Video signal (poor source)
— Adjust DNC to max. (OSD)
