Sharp LC-24DV250K (serv.man4) Service Manual ▷ View online
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LC-24DV250
-Mobile PC docking
-Embedded systems
-Embedded systems
Figure 11: Pin configurations
11.CI Interface
17MB95S Digital CI ve Smart Card Interface Block diagram:
Figure 12: CI interface
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LC-24DV250
12.Software Update
12.1 Main SW update
In MB95 project there is only one software. From following steps software update procedure can
be seen:
1
MB90_en.bin, mboot.bin and usb_auto_update_A1.txt documents should copy directly inside
of a flash memory (not in a folder).
of a flash memory (not in a folder).
2
Insert flash memory to the TV when TV is powered off.
3
While pushing the OK button in remote control, power on the and wait. TV will power-up
itself.
itself.
4
If First Time Installation screen comes, it means software update procedure is successful.
SOFTWARE UPDATE
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LC-24DV250
TROUBLESHOOTING
13.Troubleshooting
A. No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible causes: Backlight pin, dimming pin, backlight supply, stby on/off pin
BACKLIGHT_ON/OFF pin should be high when the backlight is ON. R119 must be low when the
backlight is OFF. If it is a problem, please check Q10 and the panel cables. Also it can be tested in
TP50 in main board.
BACKLIGHT_ON/OFF pin should be high when the backlight is ON. R119 must be low when the
backlight is OFF. If it is a problem, please check Q10 and the panel cables. Also it can be tested in
TP50 in main board.
Dimming pin should be high or square wave in open position. If it is low, please check S60 for Mstar
side and panel or power cables, connectors.
side and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check Q33, shown below; also it can be
checked TP53.
checked TP53.
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LC-24DV250
STBY_ON/OFF_NOT should be low for tv on condition, please check Q11’s collector.
B. CI Module Problem
Problem: CI is not working when CI module inserted.
Possible couses: Supply, suply control pin, detect pins, mechanical positions of pins.
Possible couses: Supply, suply control pin, detect pins, mechanical positions of pins.
•
CI supply should be 5V when CI module inserted. If it is not 5V please check
CI_PWR_CTRL, this pin should be low.
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