Read Sharp LC-32SH130K (serv.man12) Service Manual online
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26. TROUBLESHOOTING
26.1.
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 pin should be high in open position. If it is low, please check Q181 and panel cables.
Dimming pin should be high or square wave in open position. If it is low, please check S16 for Mstar side
and panel or power cables, connectors.
and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check CN705 for MB60, related connectors for
power supply cards.
power supply cards.
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STBY_ON/OFF should be low for standby on condition, please check R1677.
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26.2.
CI Module Problem
Problem: CI is not working when CI module inserted.
Possible causes: Supply, supply 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_POWER_CTRL, this pin
should be low.
should be low.
Please check mechanical positions of CI module.
Detect ports should be low. If it is not low please check CI connector pins, CI module pins and 3V3_VCC on
MB60.
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26.3.
Led Blinking Problem
Problem: LED blinking, no other operation
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal operation.
When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug
the TV set and control voltage points with a multimeter to find the shorted voltage to ground.
When there is a short circuit protect pin will be logic low. If you detect logic low on protect pin, unplug
the TV set and control voltage points with a multimeter to find the shorted voltage to ground.
