3-5
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
(1) No 5.0VA
Check or Replace
the D106
Check the ‘PWR CTL
“H”’ signal from µ-com
NO
NO
(2) No 5.0V
NO
(3) No 3.3V
No 5.0VA
Is the F101 normal?
Is the R105
Normal?
Is the BD101
normal?
Is Vcc (13V - 16V) sup-
plied to IC101 Pin7?
Are the D106
normal?
Is there about 2.5V
at the IC103 Pin1?
Is the D105
normal?
Is the D109
normal?
Replace the F101.
(Use the same Fuse)
Replace the
BD101.
Replace the R105.
Is the D103
normal?
Check or Replace
the D106.
Replace the
D106.
Replace the IC103.
Replace the
D105.
Replace the
D109.
Replace the
D110.
No 3.3V
Is there about 3.8V
at the IC153 pin1?
Is there about 3.3V~
5V at the IC153 pin4?
YES
Check the IC153
and Replace
Check or Replace
the D105
NO
Check the ‘PWR CTL
“H”’ signal from µ-com
Is there about 5.4V
at the IC152 pin1?
Is there about 3.3V~5V
at the IC152 pin4?
YES
Check the IC152
and Replace
Is the D110
normal?
NO
Replace the
D108.
Is the D108
Normal?
NO 5.0V
YES
YES
Power Line of Main
PCB is short
NO
Replace the
D107.
Is the D107
Normal?
Содержание LST-3100A
Страница 17: ...3 8 Fig 01 12 2880MHz clock Fig 02 48KHz clock Fig 04 Analog Audio Signal Fig 03 Data Signal ...
Страница 19: ...3 10 Fig 06 Analog Audio Signal ...
Страница 22: ...3 13 Fig 07 Digital Audio Signal Fig 08 Coaxial Digital Audio Signal ...
Страница 31: ...3 23 FIG 04 V sync signal FIG 03 H sync signal ...
Страница 33: ...3 25 FIG 05 Input Stream to IC203 FIG 06 Interrupt Signal ...
Страница 34: ...3 26 ...
Страница 35: ...3 27 ...
Страница 36: ...3 28 YES D Check analog buffers IC303 for 480i Jump to A flow ...
Страница 50: ...3 50 3 51 2 CPU AUDIO POWER CIRCUIT DIAGRAM ...
Страница 51: ...3 52 3 53 3 HD2 TUNER DVI CIRCUIT DIAGRAM ...
Страница 52: ...3 54 3 55 4 ATSCII STB CIRCUIT DIAGRAM ...
Страница 53: ...3 56 3 57 5 FRONT CIRCUIT DIAGRAM ...
Страница 54: ...3 58 3 59 PRINTED CIRCUIT DIAGRAMS 1 DIGITAL MAIN P C BOARD BOTTOM LOCATION GUIDE ...
Страница 55: ...3 60 3 61 2 DIGITAL MAIN P C BOARD TOP ...
Страница 56: ...3 62 3 63 3 FRONT P C BOARD 4 POWER P C BOARD LOCATION GUIDE ...
Страница 57: ......