Sharp LC-24LS240EXK (serv.man2) Service Manual ▷ View online
25
LC-24LS240
JK9 is used for the adapter option and also CN705 inverter socket or DB32 chassis with CN706 is used to
supply backlight.
supply backlight.
The power supplies generates 18V, 12V, 5V, 3.3V and 12V, 5V, stand by mode DC voltages. Power stage
which is on-chassis generates 5V, 3V3 stand by voltage and 12V, 8V, 5V, 3V3, 2.5V, 1.8V and 1.2V supplies
for other different parts of chassis. Chassis block diagram is indicated in the next page.
which is on-chassis generates 5V, 3V3 stand by voltage and 12V, 8V, 5V, 3V3, 2.5V, 1.8V and 1.2V supplies
for other different parts of chassis. Chassis block diagram is indicated in the next page.
4. Power Stage
The DC voltages required at various parts of the chassis and panel are provided by a main power supply
unit. MB62 chassis can operates with IPS60, IPS16, IPS17, PW26, PW27 as main power supply and also
with 12V adaptor.
unit. MB62 chassis can operates with IPS60, IPS16, IPS17, PW26, PW27 as main power supply and also
with 12V adaptor.
CN706 is used for IPS60, IPS16; and IPS17 is used for PW26 and PW27, 17PW80, 17PW07.
26
LC-24LS240
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For IPS16, IPS17, IPS60 below blocks must work properly.
The blocks on power block diagram is using dependent to main supply. For PW26 and PW27
just common blocks are enough for proper operation.
just common blocks are enough for proper operation.
27
LC-24LS240
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 should be logic low. After any short detection, SW forces LEDs on LED
card to blink.
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 should be logic low. After any short detection, SW forces LEDs on LED
card to blink.
For adapter case also below blocks are necessary.
28
LC-24LS240
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4.1. Power Management
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