VESTEL 17MB08P, Руководство по обслуживанию

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26” TFT TV Service Manual 04/03/2005
1. INTRODUCTION
26” TFT TV is a progressive TV control system with built-in
de-interlacer
and
scaler
. It uses a 1280*768
panel with 15:9 aspect ratio.The TV is capable of operation in PAL, SECAM, NTSC (playback) colour
standards and multiple transmission standards as B/G, D/K, I/I’, and L/L’ including German and NICAM
stereo. Sound system output is supplying 2x8W (10%THD) for stereo 8
Ω speakers. The chassis is
equipped with many inputs and outputs allowing it to be used as a center of a media system.
It supports following peripherals:
2 SCART’s with all of them supporting full SCART features including RGB input
1 AV input. (CVBS+ Stereo Audio)
1 SVHS iput
1 Stereo Headphone output
1 D-Sub 15 PC input
1 DVI input (Optional)
1 Audio line out
1 Stereo audio input for PC/DVI
2. TUNER
As the thickness of the TV set has a limit, a horizontal mounted tuner is used in the product, which is
suitable for CCIR systems B/G, H, L, L’, I/I’, and D/K. The tuning is available through the digitally controlled
I
2
C bus (PLL). Below you will find info on the Tuner in use.
General description of UV1316:
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of
applications. It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’. The low IF
output impedance has been designed for direct drive of a wide variety of SAW filters with sufficient
suppression of triple transient.
Features of UV1316:
1. Member of the UV1300 family small sized UHF/VHF tuners
2. Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
3. Digitally controlled (PLL) tuning via I
2
C-bus
4. Off-air channels, S-cable channels and Hyper band
5. Compact
size
6. Complies to “CENELEC EN55020” and “EN55013”
Pinning:
1. Gain control voltage (AGC) : 4.0V, Max: 4.5V
2. Tuning voltage
3. I²C-bus address select : Max: 5.5V
4. I²C-bus serial clock : Min:-0.3V, Max: 5.5V
5. I²C-bus serial data : Min:-0.3V, Max: 5.5V
6. Not connected
7. PLL supply voltage : 5.0V, Min: 4.75V, Max: 5.5V
8. ADC input
9. Tuner supply voltage : 33V, Min: 30V, Max: 35V
10. Symmetrical IF output 1
11. Symmetrical IF output 2
3. IF PART (TDA9886)
The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound IF signal
PLL demodulator for positive and negative modulation, including sound AM and FM processing.
The following figure shows the simplified block diagram of the integrated circuit.
The integrated circuit comprises the following functional blocks:
VIF amplifier, Tuner and VIF-AGC, VIF-AGC detector, Frequency Phase-Locked Loop (FPLL) detector, VCO
and divider, Digital acquisition help and AFC, Video demodulator and amplifier, Sound carrier trap, SIF amplifier,
SIF-AGC detector, Single reference QSS mixer, AM demodulator, FM demodulator and acquisition help, Audio
amplifier and mute time constant,
I²C -bus transceivers and MAD (module address), Internal voltage stabilizer.