DOWNLOAD Sharp LC-40LE361E Service Manual ↓ Size: 27.43 MB | Pages: 127 in PDF or view online for FREE

Model
LC-40LE361E
Pages
127
Size
27.43 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-40le361e.pdf
Date

Sharp LC-40LE361E Service Manual ▷ View online

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6. USB PROBLEMS   
Problem: USB is not working or no USB Detection.   
Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.   
 
7. NO SOUND PROBLEM   
Problem: No audio at main TV speaker outputs. Check supply voltages of 24V VDD_AUDIO, 3.3V 
AUDIO_AVDD and AUDIO_DVDD with a voltagemeter. There may be a problem in headphone 
connector or headphone detect circuit (when headphone is connected, speakers are automatically muted). 
Measure voltage at HP_DETECT pin, it should be 3.3v.     
 
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8. STANDBY ON/OFF PROBLEM   
Problem: Device can not boot, TV hangs in standby mode. There may be a problem about power supply. 
Check main supplies with a voltage-meter. Also there may be a problem about SW. Try to update TV 
with latest SW. Additionally it is good to check SW printouts via Teraterm. These printouts may give a 
clue about the problem. You can use Scart-1 for terraterm connection.   
 
9. NO SIGNAL PROBLEM  
 
Problem: No signal in TV mode.   
Check tuner supply voltage; 5V_VCC, 3V3_TUNER and 1V8_TUNER. Check tuner options are 
correctly set in Service menu. Check AGC voltage at IF_AGC pin of tuner
.   
 
 
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       CHAPTER 7. MAJOR IC INFORMATIONS
[1] INTRODUCTION
 
1. INTRODUCTION 
   
17MB95M main board is driven by MStar SOC. This IC is a single chip iDTV solution that supports 
channel decoding, MPEG decoding, and media-center functionality enabled by a high performance 
AV CODEC and CPU. 
Key features includes,   
  Combo Front-End Demodulator 
  A multi standard A/V format decoder   
  The MACEpro video processor   
  Home theatre sound processor   
  Internet and Variety of Connectivity Support   
  MultI-purpose CPU for OS and multimedia   
  Peripheral and power management   
Supported peripherals are:   
 
1 RF input VHF I, VHF III, UHF 
 
 
1 Satellite input 
 
 
1 Side AV (CVBS, R/L_Audio) 
 
 
1 SCART socket(Common) 
 
 
1 Side YPbPr 
 
 
1 PC input(Common) 
 
 
3 HDMI input 
 
 
1 Common interface(Common) 
 
 
1 S/PDIF output 
 
 
1 Headphone(Common) 
 
 
2 USB 
 
 
1 Ethernet-RJ45 
 
 
1 External Touchpad(Common) 
 
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[2] MAJOR IC INFORMATION
 1. TUNER   
A. SI2158 Terrestrial and Cable TV Tuner:   
A.1. Description:   
The Si2158 integrates a complete hybrid TV tuner supporting all worldwide terrestrial and cable 
TV standards. Leveraging Silicon Labs’ field proven digital low-IF architecture, the Si2158 
maintains the unmatched performance and design simplicity of the Si2153 while further reducing 
footprint size and bill of materials cost. No external LNAs, tracking filters, wirewound inductors, or 
SAW filters are used.     
Compared with competing silicon tuners and discrete MOPLL-based tuners, the Si2158 delivers 
superior picture quality and a higher number of received stations in crowded and near/far real-world 
reception conditions. The high linearity and low noise RF front-end delivers superior blocking 
performance and higher sensitivity in the presence of strong undesired channels and interference.   
The Si2158 integrates the complete signal path from antenna input to IF outputs for both analog 
and digital transmission standards. Compared to traditional discrete MOPLL-based tuners, the 
Si2158 eliminates hundreds of external components including external LNAs, tracking filter 
varactors and inductors (unlike competing silicon tuners), and SAW filters, resulting in the simplest, 
lowest-cost BOM for a hybrid TV tuner. 
   
A.2. Features:   
- Worldwide hybrid TV tuner   
- Analog TV: NTSC, PAL/SECAM   
- Digital TV: ATSC/QAM, DVB-T/T2/C/C2, ISDB-T/C, DTMB   
- 42-1002 MHz frequency range 
- Compliance to A/74, NorDig, DTG, ARIB, EN55020, OpenCable™ specifications   
- Best-in-class real-world reception   
- Exceeds discrete MOPLL-based tuners   
- Highly integrated, lowest BOM   
- No SAW filters or wirewound inductors required   
- Integrated LNAs and complete tracking filters   
- No alignment, tuning or calibration required   
- Digital low-IF architecture   
- Integrated channel select filters   
- Flexible output interface   
- ALIF to analog TV demodulator or SoC   
- DLIF to digital TV demodulator or SoC   
- 3.3 and 1.8 V power supplies   
- Standard CMOS process technology   
- 4 x 4 mm, 28-pin QFN package   
- RoHS compliant   
 
 
 
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