tvgo dvb-t31 service manual
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1
Service Manual
TVGo DVB-T31
Version: 1.0
2
Service Manual TVGo DVB-T31
Content
Chapter1. Introduction a. System block diagram……………………………………………………………………………3 b. Power block diagram………………………………………………………………………………4
Chapter2. Remove and Replacement a. Remove screw………………………………………………………………………………………….5 b. Open top cover………………………………………………………………………………………..7 c. Remove front panel…………………………………………………………………………………8 d. Remove screw on board and rear panel………………………………………………9 e. Remove board from case……………………………………………………………………….10
Chapter3. Testing Procedure a. Power checking flow chart……………………………………………………………………..11 b. Boot failure ………………………………………………………………………………………………24 c. SCART TV output ……………………………………………………………………………………29 d. SCART Video & audio input …………………………………………………………………..35 e. Audio L/R SPDIF …………………………………………………………………………………….38 f. Tuner ………………………………………………………………………………………………………….41
Chapter4. Trouble shooting Guide……………………………………….47
Chapter5. Parts list……………………………………………………………………………….49
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Service Manual TVGo DVB-T31
Chapter1. Introduction a. System block diagram.
4
Service Manual TVGo DVB-T31 b. Power block diagram.
Powerboard100-220V in
15V6.5V3.3V
IC10078L12
IC1021117-5.0
IC1031117-5.0
12V
5VD
5V
3V3
DiodeD100 DT2
1.8V
DiodeD101 2V5
3.3V_TU
3.3VM
3.3VEM
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Service Manual TVGo DVB-T31
Chapter2. Remove and Replacement a. Remove screw
Fig.(1)
Fig.(2)
Remove
Remove
6
Service Manual TVGo DVB-T31
Fig.(3)
Remove
7
Service Manual TVGo DVB-T31
b. Open top cover
Fig.(4)
Fig.(5)
Open
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Service Manual TVGo DVB-T31
c. Remove front panel
Fig.(6)
Fig.(7)
Pull it up
Push it down
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Service Manual TVGo DVB-T31
d. Remove screw on board and rear panel
Fig.(8)
Fig.(9)
Remove 7 screws
Remove 7 screws
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Service Manual TVGo DVB-T31
e. Remove board from case
Fig.(10)
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Service Manual TVGo DVB-T31
Chapter3. Testing Procedure
(a)Power checking flow chart
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Service Manual TVGo DVB-T31
(a-1) Check 15V output
Fig.(11)
Fig. (12)
15V output
13
Service Manual TVGo DVB-T31
Fig.(13)
Replace T1
14
Service Manual TVGo DVB-T31
(a-2) Check 6.5V output
Fig.(14)
Fig. (15)
6.5V output
15
Service Manual TVGo DVB-T31
Fig.(16)
Replace T1
16
Service Manual TVGo DVB-T31 (a-3) Check 3.3V output
Fig.(17)
Fig. (18)
3.3V output
17
Service Manual TVGo DVB-T31
Fig.(19)
Replace T1
18
Service Manual TVGo DVB-T31 (a-4) Check 5V output
Fig.(20)
Fig. (21)
Test here 5V out
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Service Manual TVGo DVB-T31
Fig.(22)
Replace IC102
20
Service Manual TVGo DVB-T31 (a-5) Check 5V output
Fig.(23)
Fig. (24)
Test here 5V out
21
Service Manual TVGo DVB-T31
Fig.(25)
Replace IC103
22
Service Manual TVGo DVB-T31 (a-6) Check 12V output
Fig.(26)
Fig. (27)
Test here 12V out
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Service Manual TVGo DVB-T31
Fig.(28)
Replace IC100
24
Service Manual TVGo DVB-T31 (b)Boot failure debug
Please do the Power checking first.
Start
Boot Failure
Check 27MHz
ReplaceIC300
DownloadSoftware
ReplaceIC302
END
SoftwareDownloadNot finish
ReplaceIC301
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Service Manual TVGo DVB-T31
(b-1) Check 27MHz output
Fig.(29)
Fig.(30)
27MHz out
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Service Manual TVGo DVB-T31
Fig.(31)
Replace IC300
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Service Manual TVGo DVB-T31
(b-2)Download software. If we want to update the software of DUT, RS232 ports must be well connected first.
As shown in the following picture. Master must be powered on first and then turn on the DUT.
Fig.(32)
Fig.(33)
Replace Flash IC302
DUT (Power On after master) Master (First Power On)
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Service Manual TVGo DVB-T31
(b-3) Software download not finished 10% 20%.......
Fig.(34)
Fig.(35)
Replace SDRAM IC301
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Service Manual TVGo DVB-T31
(C)SCART TV output
SCARTTV out
NG
CheckCVBS
out
Replace Q400Q409
CheckRGB R
out
ReplaceQ501
CheckRGB G
out
ReplaceQ502
CheckRGB B
out
ReplaceQ503
END
Check Audio
Out
R channelOutput NG
Replace Q201
L channelOutput NG
Replace Q203
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Service Manual TVGo DVB-T31
(c-1) Check CVBS out Measure the video signal at the output ports (collector) of transistor Q409 and Q400. The video signal will be similar to the fig. (31).
Fig.(36)
Fig.(37)
Check CVBS out
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Service Manual TVGo DVB-T31
(c-2) Check RGB video signal : R signal
Measure the output port of Q501
Fig.(38)
Fig.(39)
R signal
32
Service Manual TVGo DVB-T31
(c-3) Check RGB video signal : G signal Measure the output port of Q502
Fig. (40)
Fig.(41)
G signal
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Service Manual TVGo DVB-T31
(c-4) Check RGB video signal : B signal Measure the output port of Q502
Fig. (42)
Fig.(43)
B out
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Service Manual TVGo DVB-T31
(c-5) Check R&L channel audio output Measure the output signal at the collector terminal of Q203 and Q201
Fig. (44)
Fig. (45)
R channel L
channel
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Service Manual TVGo DVB-T31
(d)SCART Video in debug.
SCARTVideo in
NG
CheckCVBS
in
Replace Q407
END
Check Audio
in
R channelIn NG
ReplaceIC400
R channelIn NG
Replace IC400
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Service Manual TVGo DVB-T31
(d-1) Check CVBS input Measure the input video at the base terminal of transistor Q407
Fig. (46)
Fig. (47)
CVBS IN
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Service Manual TVGo DVB-T31
(d-2) Check R L channel audio input Measure the input audio signal at pin2 and pin5 of IC400, as shown in the picture.
Fig. (48)
Fig. (49)
R/L audio input
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Service Manual TVGo DVB-T31
(e)Audio L/R SPDIF
RCAAudio
NG
R channelout
ReplaceQ200
L channelout
ReplaceQ202
END
SPDIFout
Replace Q701
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Service Manual TVGo DVB-T31
(e-1)Check L/R audio output The output ports (collector terminal) of Q200 and Q202
Fig. (50)
Fig. (51)
R channel L
channel
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Service Manual TVGo DVB-T31
(e-2) Check SPDIF output Check the output signal at the emitter terminal of Q701
Fig. (52)
Fig. (53)
SPDIF output
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Service Manual TVGo DVB-T31
(f) Tuner
STB can notLock signal
Check Tuner
5V
ReplaceL104
Check Tuner3.3V
ReplaceL107
CheckTuner1.8V
ReplaceDT2
ReplaceTuner
Signal Lock
Display OK
END
ReplaceIC300
42
Service Manual TVGo DVB-T31
(f-1) Checking 5V
Fig. (54)
Fig. (55)
5V
43
Service Manual TVGo DVB-T31 (f-2) Checking 3.3V
Fig. (56)
Fig. (57)
3.3V
44
Service Manual TVGo DVB-T31 (f-3) Checking 1.8V
Fig. (58)
Fig. (59)
1.8V
45
Service Manual TVGo DVB-T31 (f-4) Replace Tuner
Fig. (60)
Replace it
46
Service Manual TVGo DVB-T31
(f.5) Tuner lock and Display fail
Fig. (61)
Replace IC300
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Service Manual TVGo DVB-T31
Chapter4. Trouble shooting Guide Problems Condition Probable Reasons Solutions
Boot Failure The power indicator LED
is on, but no video/audio
output
(1) 3.3V and 2.5V fail
(2) IC300 fail
(3) SDRAM fail
(4)flash fail
(1)Power checking
(2)change IC300
(3)change SDRAM
(4)change Flash
SCART TV out debug (1)SCART TV CVBS
output is NG
(1)Transistor Q400,Q409
(2)Switch IC400
(1)check amp. Q400,Q409
(2)check switch IC400
(2)SCART TV RGB
output is NG
(1) Amp. is disable
(2)Main chip,IC300
(1)Check video amp.
Q501,Q502,Q503
(2)Check main chip,IC300
(3)SCART TV 4:3/16:9
switch
(1)Transistor switch is
disable
(2)Main chip,IC300
(1)Check the transistor switch
whether the logic level translation
is right or not. Q404,Q408
(2)Check the logic level of main
chip,IC300
(4)SCART VCR output (1) A/V amp.
(2)A/V switch
(3) Main chip ,IC300
(1) check video amp. Q409,Q401,
Q400& video switch ,IC400.
(2)Check audio amp. Q201,Q203
and IC200 ,audio switch IC400
(3)check the main chip whether it
output the A/V signal or not .
(5)SCART VCR input (1)A/V signal source is not
functional properly.
(2)The signal used to
switch the A/V mode is not
assert.
(1)Check the A/V source
(2)Check the logic level at pin
“SLOW S/W”
(3)Make sure the transistor
Q403,Q405 are functional.
Audio L/R output、SPDIF (1)Audio L/R output is NG (1)Audio amplifiers are
disable.
(2)Maybe the main chip,
IC300, is disable.
(1)Check audio amp. Q201,Q203
and IC200 ,audio switch IC400
(2)check the main chip whether it
output the A/V signal or not .
(2)SPDIF is disable (1)Inner source is disable
(2)Q701 is destroyed.
(1)Check the signal at pin57 of
IC300 is outputted or not.
(2)Make sure the transistor Q701 is
still functional.
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Service Manual TVGo DVB-T31
Tuner circuit Tuner can not lock the
signal
(1)The parameters are not
set correctly.
(2)Control signals are not
correctly or disable.
(3)Tuner is destroyed
(4)The main chip is
destroyed.
(1)Check all the parameters are
properly set.
(2)Check all the power supply used
in the Tuner.
(3)Measure the control signals and
check whether they are transmitted
or not.
(4)If the problems still can not be
solved, the tuner should be
changed.
(5)If above problems still exit, the
main chip , IC300, can be changed.
RS232 Data can not be transmitted
or received through the
port.
(1)RS232 chip is disable
(2)The data bus is not well
connected to the main
board
(3)Without power supply
(1)Make sure the connection
between main board and the data
bus is well.
(2)Make sure the power is correct
(3)Check the signal at the input
port of RS232
(4)If all above are OK, RS232 chip
can be changed.
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Service Manual TVGo DVB-T31
Chapter5. Parts list Location NUM.
Description Part number
T1 XFMR RF JW0419 大忠 42041-00033-001 IC100 IC D DIP REG 78L12 TO92B CJ 65612-00007 IC102 IC D DIP REG AZ1117T-5.0 TO220 UTC 65612-00067 IC103 IC D DIP REG AZ1117T-5.0 TO220 UTC 65612-00067 IC300 IC D SMD CPU STI5518BQC 65111-00068 IC301 IC D SMD MEM A2S64S40DTP-G7 PSC 65211-00186 IC302 IC D SMD MEM A29L800TV-70 AMIC 65211-00202 IC400 IC D SMD LOG HEF4053BT SO16 Philips 65311-00007 Q200 XSTR SMD NPN 2S1623 SOT-23 NEC 62111-00008 Q201 XSTR SMD NPN 2S1623 SOT-23 NEC 62111-00008 Q202 XSTR SMD NPN 2S1623 SOT-23 NEC 62111-00008 Q203 XSTR SMD NPN 2S1623 SOT-23 NEC 62111-00008 Q400 XSTR SMD NPN 2S1623 SOT-23 NEC 62111-00008 Q407 XSTR SMD PNP 2SA812 SOT23 NEC 62112-00002 Q409 XSTR SMD PNP 2SA812 SOT23 NEC 62112-00002 Q501 XSTR SMD PNP 2SA812 SOT23 NEC 62112-00002 Q502 XSTR SMD PNP 2SA812 SOT23 NEC 62112-00002 Q503 XSTR SMD PNP 2SA812 SOT23 NEC 62112-00002 Q701 XSTR SMD NPN SMBT3904 62111-00013 L104 RES SMD 0805 0R 5% 51014-0000J L107 RES SMD 0805 0R 5% 51014-0000J TN100 P/PARTs TUNER UTB-002NH PESI 81002-90403 DT2 DIO DIP G 1N4002 61121-00011
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