LG L15V26 - 32 Tuning System Overview

Directview LCD Training 30 Circuit Descriptions
CIRCUIT DESCRIPTIONS
32” TUNING SYSTEM
OVERVIEW
The tuning system of CableCARD
TM
models have four essential parts: analog tuner, digital tuner,
outer band tuner, and cable card slot.
Analog Tuner
The analog tuner is a standard NTSC tuner. It tunes analog signals from off-the-air (OTA) broadcasts
and analog cable signals.
Digital Tuner
The ATSC tunes digital OTA signals (8-VSB) and digital cable signals (QAM). It supports both
QAM64 and QAM256 digital cable standards.
Outer Band Tuner
This tuner translates data from digital signals. Mainly used for communications between a cable
card and the cable company.
CableCARD
TM
Slot
A cable card on a Digital Cable Ready (DCR) television decrypts encoded signals from digital cable
allowing cable companies to protect content on certain channels. Please refer to our cable card
training for more information. For more information refer to the Cablecard section a the end of
this manual.
TROUBLESHOOTING
No Analog TV (Cable or OTA)
Problem: Snow on all analog cable and OTA channels. Occasionally a memory card error appears on
the screen.
Resolution: Check the analog tuner on the jackpack PCB. Check circuitry and connections, replace
the PCB if necessary.
Antenna Input
Accepts both digital
and analog over-
the-air signals.
Cable Input
Accepts both
digital and analog
cable.
Cable Card Slot
Provides access to
scrambled
(encrypted) channels.
Signal Splitter
Analog Tuner
Analog cable and
NTSC over-the-air.
Outer Band Tuner
Digital Cable
Data Stream.
Digital Tuner
Digital Cable
and ATSC
(QAM)
over-the-air.