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1.
Activate Backlights Test
TV Screen for active backlight LEDs.
9
2.
If No BACKLIGHTS
All Vdrv to LD from SMPS for approx 75 VDC with meter.
9
•
If any missing or wrong voltages remove
Check ALL Vdrv on the SMPS Connector
9
•
If any Vdrv is still missing or wrong at SMPS, replace SMPS.
•
If Vdrv is restored on SMPS replace LD Board.
3.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
SIMPLE BL ERROR TEST :
-
Check each panel ribbon configuration.
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•
If any have a different number of pins or a different pin or drive configuration
go to additional backlight test.
If each have same number of pins and exact pin configuration.
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1.
Verify exact Panel Backlight error location (dark vertical line).
2.
Turn off TV and Remove AC Power.
3.
Swap the two adjacent panel ribbons in that area.
4.
Reconnect AC Power and turn on the TV.
Check location of defect (dark vertical line)
9
•
If the defect remained in the same location the panel is defective.
•
If the defect moved to another location the LD Board is defective
NOTE
•
In rare cases the Main Board may be defective since it provides Local dim control.
: Disconnect Lead Cable from Main to Power Supply.
CNV903 LD connector to SMPS and retest.
CNV903 .
4. Troubleshooting
do not perform this simple test
4-7
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