Sharp LC-50LE761K Service Manual ▷ View online
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Main SW update
In MB90 project there is several file of software. From following steps software update procedure can be seen:
1. MB90_en.bin and usb_auto_update_A1.txt documents should copy directly inside of a flash
memory (not in a folder). In some case, it could be necessary to include additional file:
mboot_spi.bin.
2. Insert flash memory to the TV in USB-1 port when TV is powered off. USB-1 port is just above of
yellow SIDE AV connector.
3. While pushing the OK button in remote control, power on the wait until LEDs blink quickly. TV
will power-up itself.
4. When the standby LED starts to blink rapidly, you can release the OK button.
5. If First Time Installation screen comes, it means software update procedure is successful.
6. After FTI menu appears, you should power OFF and ON the TV set.
7. Updated software version might be checked from service menu (menu--- 4, 7, 2, 5)
[2] SOFtWARE UPDATE
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CHAPTER 6. TROUBLESHOOTING
[1] Troubleshooting
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15.Software Update
15.1 Main SW update
In MB90 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_mb90.txt documents should copy directly
inside 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.
4. If First Time Installation screen comes, it means software update procedure is successful.
16.Troubleshooting
A. No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible couses: 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 TP69 in main board.
1. No Backlight Problem
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Dimming pin should be high or square wave in open position. If it is low, please check S119
and S145 for Mstar side and panel or power cables, connectors.
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Backlight power supply should be in panel specs. Please check Q34, shown below; also it can
be checked TP108.
STBY_ON/OFF_NOT should be low for tv on condition, please check Q11’s collector.
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