Sharp LC-40LS340E, Service Manual

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LC-32LE340/343
LC-40LE340/343
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17. LNB supply and control IC
ST LNBH23L
a) Key Features
Ŷ&RPSOHWHLQWHUIDFHEHWZHHQ/1%DQG,ð&EXV
Ŷ%XLOW -in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93%
@0.5 A)
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Ŷ&RPSOLDQWZLWKPDLQVDWHOOLWHUHFHLYHUVRXWSXWYROWDJHV pecification
Ŷ$X[LOLDU\PRGXODWLRQLQSXW(;70SLQIDFLOLWDWHV'L6(T&Œ;HQFRGLQJ
Ŷ$FFXUDWHEXLOW -in 22 kHz tone generator suits widely accepted standards
Ŷ/RZ -drop post regulator and high efficiency step-up PWM with integrated power NMOS
allow low power losses
Ŷ2YHUORDGDQGRYHU -temperature internal protections with I²C diagnostic bits
Ŷ/1%VKRUWFLUFXLWG\QDPLFSURWHFWLRQ
Ŷ - 4 kV ESD tolerant on output power pins
Applications
Ŷ67%VDWHOOLWHUHFHLYHUV
Ŷ79VDWHOOLWHUHFHLYHUV
Ŷ3&FDUGVDWHOOL te receivers
Description
Intended for analog and digital satellite receivers, the LNBH23L is a monolithic voltage
regulator and interface IC, assembled in QFN32 5 x 5 specifically designed to provide the 13 /
18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna
dish or to the multi-switch box. In this application field, it offers a complete solution with
extremely low component count, low power dissipation together with simple design and I²C
standard interfacing.
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b) Block Diagram
18. Software Update
18.1 Main SW update
In MB70 project you can update the main IC software by using USB ports. You can find the
SW update procedure below.
1. Software files should copy directly inside of a flash memory(not in a folder).
2. Put flash memory to the tv when tv is powered off.
3. Power on the and wait. TV will power-up itself.
4. If First Time Installition screen comes, it means software update procedure is succesful.
5. You can check the SW release name from service menu.
18.2 Panel Configuration File update
In MB70 project you can update the panel Configuration file by using USB ports. You can
find the update procedure below.
1. Please copy panel configuration files to USB root.
2. Turn power to OFF by remote controler and plug the USB to TV.
3. Turn power to ON by using remote controler.
4. TV standby led will blink rapidly during the sw update. Please wait approximately for 1-2
minutes.
5. TV will open automatically with the new panel configurations
.
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LC-40LS340