RCA HD50LPW175 50" HDTV Logo
Posted on Sep 12, 2008
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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

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  • Posted on Sep 12, 2008
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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.

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