Full Text Searchable PDF User Manual
Service Manual
TVB-S201 PRO
Service Manual
Table of Contents
TVB-S201 PRO ........................................................................................................................... 0
Chapter 1. INTRODUCTION........................................................................................................... 2
a. Hardware ...............................................................................................................................2
b. Software ................................................................................................................................ 2
c. Block Diagram ...................................................................................................................... 2
Chapter 2. Testing Procedures .......................................................................................................... 3
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 3. Troubleshooting Guide.................................................................................................. 15
Chapter 4. Removal and Replacement............................................................................................ 16
Chapter 5. Parts list ......................................................................................................................... 17
Chapter 6. Tools .............................................................................................................................. 17
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Service Manual
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
Audio Selector
PC audio line in
Audio out
EEPROM
Button input
I C BUS
2
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Service Manual
Chapter 2. Testing Procedures
a. Testing flow chart
T
T
T
T
REPLACE REG3
T
REPLACE ADAPTER
REPLACE REG2
F
F
Check REG5
Pin 2 +2.5V
REPLACE REG5
Check REG4
Pin 2 +1.8V
F
REPLACE REG4
Check REG3
Pin 2 +3.3V
Check REG2
Pin 2 +3.3V
Check VCC
+5V
START
A
F
F
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Service Manual
A
T
Check X1
X’TAL signal
Check X2
OSC signal
Check Y301
X’TAL signal
T
Check U1
CLK signal
REPLACE U1
REPLACE Y301,U301
F
REPLACE X2,U5,U1
T
REPLACE X1,U22
F
T
F
T
F
END
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b. Check VCC +5V
L34 PIN1
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Service Manual
c. Check REG2 Pin 2 Signal
REG2.PIN 2
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Service Manual
d. Check REG5 Pin 2 Signal
REG5 PIN2
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Service Manual
e. Check REG3 Pin 2 Signal
REG3 PIN2
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Service Manual
f. Check REG4 Pin 2 Signal
REG4 PIN2
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Service Manual
g. Check X1,U22 Pin 26 X’TAL Signal
U22 PIN26
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Service Manual
h. Check X2 Pin 3,U5 Pin 62,U1 Pin 41 OSC Signal
U1 PIN41
U5 PIN62
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Service Manual
i. Check Y301 X’TAL Signal
C322 PIN1
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Service Manual
j. Check U1 CLK_SAA Signal
U1 PIN58
U5 PIN66
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Service Manual
k. Check U1 RAM_CLK Signal
U1 PIN136
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Service Manual
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
1. Buttons malfunction.
1. Micro SW NG
1.Change Micro SW
3. incorrect color
display
1. VGA output malfunction. 1. Parts failure.
1.Change U15
4. LED no lit
1. no power.
1.LED failure
1.Change LED
5. Remote not
functions
1. Remote control
malfunction.
1.IR1 failure
1. .Change IR1
6. No TV image 1. Display malfunction. 1.TDA8275
NG 1.Change
Y301
7. Black & white
image only
1. Only black and white
color in TV,AV,SVHS
modes.
1.X’TAL NG
1.Change X2
8. No display in
AV,SVHS
modes
1. No display in AV,SVHS
modes.
2. display correctly in TV
mode.
1.SAA 7135 NG
1.Change U5
9. PIP MODE
malfunction
1. The desktop can not
work in PIP MODE
1.X’TAL NG
1.Change X1
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Service Manual
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
PCB from case
Remove the PCB by lifting it
and pulling it slightly toward
you, being careful not to
damage the LED light.
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Service Manual
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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