LG 42LH20 Series, Руководство по обслуживанию

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February 2009 42LH20
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LCD Controller Board
The T-Con IC UC1 receives from the Main Board at CN5 12 Bit
LVDS Signals (Video) which it processes into TFT Drive Signals which through
connectors CN3 and CN4 controls the LCD Panel.
12V is supplied to the T-Con Board on connector CN5 from the Main Board
(easily measured at fuse F1).
Diode LED1 is a boot up indicator and is helpful in troubleshooting as a quick
indication of a loss of supply and or a Boot Up problem.
There are two DC to DC converters that create
(17V developed at the cathode of D14) and
(3.3V developed at the cathode of D13).
The 3.3V can also be measured at the ribbon connectors delivering signals to
the TFT panel
(CN3 pins 57, 58 or 59) and
(CN4 pins 2, 3 or 4).
T T - - CON BOARD SECTION CON BOARD SECTION