Question about RCA HD50LPW175 50" HDTV

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Thomson 27LCDB03B Hello Sir, Based on the following symptoms please suggest:- 1. No backlight and LCD dark. 2. Tune to TV station in TV mode, got sound and volume can control but no display. 3. Connect to PC & sound card, got sound, no display. 4. Opened back cover and measured for DC volt, 12V, +/- 16V & 5Vs all got. 5. Upon connecting the power adapter & switching ON, briefly the backlight comes ON then OFF. I guess this is normal since the 21" LCD TV i got (Thomson) also does the same upon powering ON the switch. Please request if you need further info. Thank you.

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  • ram53my Sep 12, 2008

    Hei Jaime,



    The service manual does not seems to be the one for the 27LCDB03B model that I have. For instance there are 2 connectors J1 & J2 if I am not mistaken to the inverter board.Furthermore there are 2 fans connected to the main board.



    Please send me the correct manual. Thank you.

  • ram53my Sep 12, 2008

    Dear Jaime867,



    Try to obtain the Thomson 30LCDB03B service manual. The unit I have have 2 connectors from the PFC/DC+DC/AUDIO POWER BD to the inverter bd. Furthermore the disassembly/assembly procedures totally cannot be used for the 27" model.

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What does the inverter board look like there is a little red llight on on the board inside the big box beneath where the power cord plugs in is that little red light suposed to be on all the time

Posted on Dec 03, 2009

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If all the voltages measure normal, the failure could be in the LCD's inverter board. I've checked the schematic and it seems like the 16 volts could be a bit higher, check the electrolytic capacitors filtering the voltage for the inverter board.
Click here to download the service manual.
Good Luck.

Posted on Sep 12, 2008

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