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TVB-S201 PRO
User Manual
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Genius TVB-S201 PRO User Manual

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Service Manual
TVB-S201 PRO
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Table of Contents
TVB-S201 PRO ...........................................................................................................................0
a. Hardware...............................................................................................................................2
b. Software................................................................................................................................2
c. Block Diagram ......................................................................................................................2
a. Testing flow chart.....................................................................................................................3
b. Check VCC +5V......................................................................................................................5
c. Check REG2 Pin 2 Signal........................................................................................................6
d. Check REG5 Pin 2 Signal........................................................................................................7
e. Check REG3 Pin 2 Signal........................................................................................................8
f. Check REG4 Pin 2 Signal.........................................................................................................9
g. Check X1,U22 Pin 26 X’TAL Signal.....................................................................................10
h. Check X2 Pin 3,U5 Pin 62,U1 Pin 41 OSC Signal................................................................11
i. Check Y301 X’TAL Signal.....................................................................................................12
j. Check U1 CLK_SAA Signal ..................................................................................................13
k. Check U1 RAM_CLK Signal................................................................................................14
Chapter 6. Tools..............................................................................................................................17
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Chapter 1. INTRODUCTION
a. Hardware
♦ PC586 above ♦ Connection port ： VGA
b. Software
♦ Win98 above
c. Block Diagram
TV VGA VGA (Silicon Tuner) IN OUT
S-Video Video PIP select Module
SAA-7135 processor STV-108A PIP
Composite & Selector Audio Line in
Audio Switch MCU + OSD Audio Amplifie SDRAM SM-602
2
I C BUS
Audio Selector
PC audio line in Audio out EEPROM Button input
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Chapter 2. Testing Procedures
a. Testing flow chart
START
Check VCC +5V
F
REPLACE ADAPTER
T
F
Check REG2 Pin 2 +3.3V
REPLACE REG2
T
F
Check REG5 Pin 2 +2.5V
REPLACE REG5
T
F
Check REG3 Pin 2 +3.3V
REPLACE REG3
T
F
Check REG4 Pin 2 +1.8V
REPLACE REG4
T
A
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A
T
Check X1 X’TAL signal
F
REPLACE X1,U22
T
Check X2 OSC signal
F
REPLACE X2,U5,U1
T
Check Y301 X’TAL signal
F
REPLACE Y301,U301
T
Check U1 CLK signal
T
END
F
REPLACE U1
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b. Check VCC +5V
L34 PIN1
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c. Check REG2 Pin 2 Signal
REG2.PIN 2
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d. Check REG5 Pin 2 Signal
REG5 PIN2
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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
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h. Check X2 Pin 3,U5 Pin 62,U1 Pin 41 OSC Signal
U5 PIN62
U1 PIN41
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i. Check Y301 X’TAL Signal
C322 PIN1
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j. Check U1 CLK_SAA Signal
U5 PIN66
U1 PIN58
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k. Check U1 RAM_CLK Signal
U1 PIN136
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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
work
3. incorrect color
display
4. LED no lit 1. no power. 1.LED failure 1.Change LED
5. Remote not
functions
6. No TV image 1. Display malfunction. 1.TDA8275 NG 1.Change Y301
7. Black & white
image only
8. No display in
AV,SVHS modes
9. PIP MODE
malfunction
1. Buttons malfunction. 1. Micro SW NG 1.Change Micro SW
1. VGA output malfunction. 1. Parts failure. 1.Change U15
1. Remote control malfunction.
1. Only black and white color in TV,AV,SVHS modes.
1. No display in AV,SVHS
modes.
2. display correctly in TV
mode.
1. The desktop can not
work in PIP MODE
1.IR1 failure 1. .Change IR1
1.X’TAL NG 1.Change X2
1.SAA 7135 NG 1.Change U5
1.X’TAL NG 1.Change X1
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Chapter 4. Removal and Replacement
Step Description Picture
1. Turn the device upside down with the ports facing you.
2.Remove screws
Device before disassemble.
Remove the rubber protectors at the corners and take out the screws.
3.Open the case
4. Remove PCB from case
Remove bottom cover.
Remove the PCB by lifting it and pulling it slightly toward you, being careful not to damage the LED light.
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Chapter 5. Parts list
Description Parts number Description Parts number

U1 102100010800 REG5 101900111702

U22 102100060200 REG4 101900111707
U5 102100713500 REG2,REG3 101900886000
X1 12MHZ 201511200000
X2 OSC24.576MHZ 201522457600
Y301 16MHZ 201511600000
SW1~SW6 TACT SWITCH 201200300404
Chapter 6. Tools
1. Screwdriver cross
2. Oscilloscope
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