Grundig POWERMAX Q2, Руководство по обслуживанию

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GENERAL OPERATING PRINCIPLE OF THE TV
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General Operating Principle of
Chassis
No external IC is used in URSA mainboard in
GF chassis products in contrast to KR chassis
and it is combined with the main integrated
circuit.
As seen in block diagram, twin-triple tuner sup-
port is offered. Two satellite tuners and a single
tuner that can receive two different DVB-T/T2/C
broadcasts at the same time are used. These
broadcasts are sent to the main IC via a single
demodulator. Signals received from all audio
and video sources provide input to the main
integrated circuit. Image is sent to the panel
with LVDS/Vby1 lines from the main integrated
circuit after it has been processed. Likewise, the
sound is sent to the sound amplifier after being
processed. 6 DDR3 RAM is used for main the IC
and MEMC circuit's processes.
While performing these processes, the main
integrated circuit reads software installed on
flash and key data. There is not an SPI Flash
where boot software is stored or a system EE-
PROM where key data is stored. All these are
transferred to eMMC flash and main IC. These
two main integrated circuits must be checked if
key data or boot software are considered faulty.
RAMs are used for the processes performed
within the integrated circuit.
Surely, the system should be supplied power in
5V, 3.3V, 1.5V, 1.8V, 1.25V and 1.15V, which is
required for these processes.
DC Power Stage
Chassis and supply unit should be connected
via S900 connector. In GF-chassis products,
only 5V is fed from the supply unit (PSU) in
Stand-By mode (+5V2_ST). 12V and 24V sup-
plies are switched on by the control of main
integrated circuit when television is going out of
Stand-By for Eternity panels.
On S900 connector, 3 main control signals
are sent to the power supply. The first signal is
"POWER_SW"; it is sent to the power source
from 10th pin of S900 connector. It switches
on 12V for Eternity cabinets and 12V and 24V
voltages for Eternity cabinets in the "ON" status.
The 2nd signal is "BL_CTRLX"; it switches panel's