RCA 39LB45RQ LCD TV has upside down picture.

SOURCE: RCA P46921 alignment issues

I am having the same problem. Just came across this information on another website. Hope it helps. (Both of us).... http://myweb.accessus.net/~090/how2adj.html#5.4 5.4 GE / RCA / PROSCAN Read the _ SERVICE MODE WARNING _ before proceeding. To enter service mode, push and hold the [Menu] button on the set. While holding, push and release the [Power] button, then the [Vol +] button. You will now have some information on the screen: "P0 V0" To actually be able to change these values, you must push [Vol +] on the remote so the information reads V76. Then pushing on the Channel +/- will change the "P" value. P1 - 3 are error codes. If there is a problem with the set that can be self-diagnosed, the "V" will report the code. These codes are available in the RCA repair manual. P4 - 7 control the horizontal size, shift, vertical size and shift. You may also find a summary leaflet for the service tech clipped somewhere inside the chassis. The procedures for getting into the service mode, as well as the service items of interest will be there. If you're attempting to adjust color or geometry errors, you'll need the Video Essentials DVD, Laser Disc or some other source of test material.

SOURCE: RCA color tv,model 27F520T,Chassis M134C

On the tv panel push and hold volume down until volume is all the way down and keep holding, then push the info button on the remote.

SOURCE: RCA D52W20 52" TV SHUTS DOWN AFTER A FEW MINUTES

you have a bad capacitor around flybackor neer by transformer.

SOURCE: Service Menu RCA HD56W58 56" TV

http://www.hdtvoice.com/voice/showthread.php?t=24248

go to http://www.thomsonnetwork.com

Click on "publications ordering" (in the list on the lefthand side of the homepage)
Click the box for service information. Enter the model number (or click the chassis button and enter the chassis number).

In the list of documents you can purchase for $40 ESIATC32X -- the service manual on CD for your set.

This disk will have the info you need.

If you do decide to purchase it (and I highly reccommend you do so), send me the alignment chapter and I would be happy to post it for others who have the same set on my homepage.

SOURCE: How to exit service menu

Try this
Use the CLEAR button / long press on the MENU button to toggle between user and svc menu. Press EXIT button to exit svc menu.