Land Rover Discovery: Television Control Module (TVCM)
- Connectors - TV Antenna amplifiers
- CVBS connector - Output to Touch Screen (TS)
- LVDS connector - Output to RSECM
- Connector - MOST
- Connector - 12V power supply from Battery Junction Box (BJB) and ground
The TVCM is located below the front left seat and is attached to a bracket adjacent to the Audio Amplifier module (AAM).
The TVCM receives a power supply via fuses and a relay in the Quiescent Current Control Module (QCCM). The QCCM receives a power supply via the Battery Junction Box (BJB). On vehicles with the stop/start system, the power from the BJB is supplied to the QCCM via the Voltage Quality Module (VQM).
On vehicles with RSE, the video output is passed from the TVCM on LVDS to the RSECM, and from the RSECM on CVBS to the TS. On a vehicle with RSE fitted the CVBS output from the TVCM is not used.
On vehicles without RSE, the video output is passed from the TVCM on CVBS to the TS. LVDS output is not used.
The front seat occupants can view the TV transmissions on the TS if the vehicle is stationary (market dependent). If the vehicle is fitted with a dual view TS then the front passenger can view the TV transmissions even when the vehicle is moving, but the driver will only be able to watch TV transmissions (or video) when stationary. This can vary depending on local market laws. When the RSE system is fitted, the TV control module allows the rear seat occupants to view television transmissions on the RSE screens.
Due to analogue transmissions Worldwide being switched off, Land Rover are introducing more TVCMs to support the numerous digital TV standards that are being implemented. To ensure that analogue and digital transmissions are received in all markets, three types of TVCM are available.
The type of TVCM fitted is dependent on which digital standard is supported in different markets (if at all).
- Digital Hybrid TVCM - this TVCM supports digital DVB-T standard (MPEG2 only) and analogue TV transmissions. This TVCM is only fitted to markets that still have significant analogue broadcasts and minor digital coverage or to vehicles in markets that still have significant analogue broadcasts and where Land Rover do not currently have a TVCM that supports the digital TV standard in that market. This TVCM requires the use of a link lead that combines the power/ground and CVBS output into one connector that mates with the connectors on this type of module.
- DVB-T TVCM - this TVCM is digital only (no analogue tuner) and supports both MPEG2 and MPEG4 digital compression standards. This TVCM is fitted in any market that has significant DVB-T coverage (most of Europe and some of the rest of the World).
- ISDB-T TVCM - this TVCM is for the Japanese market only and receives ISDB-T digital broadcasts only (no analogue). This TVCM requires the use of a link lead that combines the power/ground and CVBS output into one connector that mates with the connectors on this type of module.
The TVCM is connected on the MOST ring. audio signals from the TVCM are output on the MOST to the AAM. Video output from the TVCM is on an LVDS cable to the RSECM or a CVBS screened co-axial cable to the TS in vehicles without the RSE system. Four further connections provide for the signal input from three TV antenna amplifiers which are in turn attached to four antennas in the rear quarter windows.
For additional information, refer to: Antenna (415-01 Information and Entertainment System, Description and Operation).
The TVCM contains three or four internal tuners (depending on the TVCM fitted); all of the tuners are connected to the antennas. The tuners receive the audio and video signals. The tuner, or combination of tuners with the strongest signal, are automatically used to display the required TV channel.
One of the internal tuners is always used to scan the locality for receivable channels (background scanning). The tuner can detect different frequencies transmitting the same channel and can select the strongest signal for use.
In certain areas signal strengths will vary. When in an area of weak reception, a break-up in picture and sound quality, or a blank screen or frozen picture and audio muting may occur. Dependent on the type of TVCM fitted, it may be of benefit to switch between analogue and digital TV stations.
The main advantage of digital TV reception is the improved picture quality.
Three TV antennas are located in the rear quarter windows. In the event of a loss of digital reception, a 'loss of reception' message is displayed. The TV system also has a programme diversity function as well as antenna diversity that allows the current tuned programme to be maintained as the vehicle passes through regions with different transmitters broadcasting on different frequencies. This function is only occurs where the reception data for the presently tuned channel matches the data of the new signal.
The system offers a choice of aspect ratios, between 4:3, 16:9 and zoom.
The zoom ratio will always try to fill the screen and avoid the black bars/squashed image. For digital signals the broadcaster will usually send the correct format for the transmitted programme and this will remove one of the incorrect formats from the screen (4:3 or 16:9). The "Zoom" option is always available and will always be selected as the default format. If the format is unknown (typical for analogue) then all three format options will be displayed. The TS offers picture quality using a resolution of 800x480 pixels for single view and 400x480 pixels for dual view.
Television Control Module (TVCM) - Japan
Japanese market vehicles are fitted with a TVCM unique to that market. The TVCM has a slot to allow a B-CAS (BS Conditional Access Systems Co., Ltd.) card to be inserted. All digital TV's in Japan (home systems included) require a conditional B-CAS access card. This card decrypts the TV broadcast signal to allow it to be displayed as all broadcasts in Japan are encrypted. Without this card there will be no picture or audio.
B-CAS (BS Conditional Access Systems Co., Ltd.) is a vendor and operator of the Integrated Services Digital Broadcasting (ISDB) CAS system in Japan.
All ISDB receiving apparatus requires a B-CAS card under regulation, the BCAS card is supplied as the standard accessory in Japan.
Integrated Services Digital Broadcasting (ISDB) is a Japanese standard for digital television and digital radio used by the country's radio and television stations.
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