Read Sharp LC-40LS240E Service Manual online
27
LC-40LS240
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages
when any Vcc supply shorts to ground. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin shoXld be logic low. After any short
when any Vcc supply shorts to ground. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin shoXld be logic low. After any short
detection, SW forces LEDs on LED card to blink.
100R
R1973
Q211
BC848B
1
2
3
R1636
10k
1
2
10k
R1635
1
2
3V3_TUNER
12V_VCC
3V3_VCC
5V_VCC
R1750
22k
VDD_AUDIO_PWR
10k
R1631
1
2
BAW56
D184
12
3
10k
R1639
12
10k
R1638
1
2
Q178
BC848B
1
2
3
Q180
BC858B
1
2
3
3V3_STBY
R1649
33k
1
2
D185
BAW56
12
3
D186
BAW56
12
3
100nF
C971
10V
1
2
PROTECT
TP202
1
U7
LM809
1
3
2
RST
VCC
GND
3V3_STBY
12V_STBY
R20
10k
1
2
R40
20k
10k
R21
R1727
33k
1
2
SHORT CCT PROTECTION
ADAPTOR OVER VOLTAGE PROTECTION
2
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2
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2
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2
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40
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2
2
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37
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