Genius TV Receiver TVB S201 PRO User Manual
Service Manual  
TVB-S201 PRO  
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Service Manual  
Chapter 1. INTRODUCTION  
a. Hardware  
♦ PC586 above  
♦ Connection port ï¼š VGA  
b. Software  
♦ Win98 above  
c. Block Diagram  
TV  
VGA  
IN  
VGA  
OUT  
(Silicon Tuner)  
I2C BUS  
S-Video  
Video  
PIP select Module  
PIP  
SAA-7135  
processor  
STV-108A  
Composite &  
Audio Line in  
Selector  
Audio Switch  
Audio Amplifie  
MCU + OSD  
SM-602  
SDRAM  
Audio Selector  
PC audio line in  
Audio out  
EEPROM  
Button input  
Version 1.0  
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Chapter 2. Testing Procedures  
a. Testing flow chart  
START  
F
Check VCC  
+5V  
REPLACE ADAPTER  
REPLACE REG2  
REPLACE REG5  
REPLACE REG3  
REPLACE REG4  
T
F
Check REG2  
Pin 2 +3.3V  
T
F
Check REG5  
Pin 2 +2.5V  
T
F
Check REG3  
Pin 2 +3.3V  
T
F
Check REG4  
Pin 2 +1.8V  
T
A
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Service Manual  
A
T
F
F
Check X1  
REPLACE X1,U22  
X’TAL signal  
T
REPLACE X2,U5,U1  
Check X2  
OSC signal  
T
F
F
REPLACE Y301,U301  
Check Y301  
X’TAL signal  
T
REPLACE U1  
Check U1  
CLK signal  
T
END  
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b. Check VCC +5V  
L34 PIN1  
Version 1.0  
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c. Check REG2 Pin 2 Signal  
REG2.PIN 2  
Version 1.0  
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d. Check REG5 Pin 2 Signal  
REG5 PIN2  
Version 1.0  
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e. Check REG3 Pin 2 Signal  
REG3 PIN2  
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f. Check REG4 Pin 2 Signal  
REG4 PIN2  
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g. Check X1,U22 Pin 26 X’TAL Signal  
U22 PIN26  
Version 1.0  
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h. Check X2 Pin 3,U5 Pin 62,U1 Pin 41 OSC Signal  
U1 PIN41  
U5 PIN62  
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i. Check Y301 X’TAL Signal  
C322 PIN1  
Version 1.0  
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j. Check U1 CLK_SAA Signal  
U1 PIN58  
U5 PIN66  
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k. Check U1 RAM_CLK Signal  
U1 PIN136  
Version 1.0  
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Chapter 3. Troubleshooting Guide  
Problems  
Condition  
Probable Reasons  
Solutions  
1. Blank Screen 1. Sound only, no picture. 1. Parts failure.  
Change all the parts  
below  
1. X2  
2. REG5  
3. U1  
2. Buttons don’t 1. Buttons malfunction.  
work  
1. Micro SW NG  
1.Change Micro SW  
3. incorrect color 1. VGA output malfunction. 1. Parts failure.  
display  
1.Change U15  
4. LED no lit  
1. no power.  
1.LED failure  
1.IR1 failure  
1.Change LED  
1. .Change IR1  
5. Remote not  
functions  
1. Remote control  
malfunction.  
6. No TV image 1. Display malfunction.  
7. Black & white 1. Only black and white  
1.TDA8275 NG  
1.X’TAL NG  
1.Change Y301  
1.Change X2  
image only  
color in TV,AV,SVHS  
modes.  
8. No display in 1. No display in AV,SVHS 1.SAA 7135 NG  
1.Change U5  
1.Change X1  
AV,SVHS  
modes  
modes.  
2. display correctly in TV  
mode.  
9. PIP MODE  
malfunction  
1. The desktop can not  
work in PIP MODE  
1.X’TAL NG  
Version 1.0  
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Chapter 4. Removal and Replacement  
Step  
Description  
Picture  
1. Turn the  
device upside  
down with the  
ports facing  
you.  
Device before disassemble.  
2.Remove  
screws  
Remove the rubber protectors  
at the corners and take out the  
screws.  
3.Open the  
case  
Remove bottom cover.  
4. Remove  
Remove the PCB by lifting it  
PCB from case and pulling it slightly toward  
you, being careful not to  
damage the LED light.  
Version 1.0  
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Service Manual  
Chapter 5. Parts list  
Description  
Parts number  
Description  
Parts number  
101900111702  
101900111707  
101900886000  
201511200000  
201522457600  
201511600000  
U1  
102100010800 REG5  
102100060200 REG4  
U22  
U5  
102100713500 REG2,REG3  
X1 12MHZ  
X2 OSC24.576MHZ  
Y301 16MHZ  
SW1~SW6 TACT SWITCH 201200300404  
Chapter 6. Tools  
1. Screwdriver cross  
2. Oscilloscope  
Version 1.0  
Page 17  
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