Please read the lower note below!!!
NEVER...NEVER...adjust the service menu, unless your'e sure the T.V. doesn't have an electronic problem...& it DOES!!! Check the small electrolytics near the vertical IC. Quite unlikely that the service menu is in need of alignment. Also, you could really fudge up the T.V., if you don't know what your'e at! Also, be VERY, VERY carefull not to totally kill the set by letting light hit the DVI Digital Input Module!!!
JVC AV-48WP30\IMPORTANT NOTICE BEFORE WORKING ON THIS SET. If you remove the rear cover while the power cord is live you will destroy all DVI programming inside the DVI Digital Input Module!\The only way to get this programming back into the unit is to send it to JVC that sends it to Japan\This module is mounted on the rear AV Jack Board and has a light sensor built in. When light is detected the module does a complete reset and erases the EEPROM\1. Prior to disassembly* unplug the power cord from the AC outlet without fail. 2. Short the SB connector pin 1 and pin 2 of the Digital Input Module.\3. Before the rear panel is inserted into the cabinet* release the short circuit on the SB connector. 4. After releasing the short circuit between the SB connector\do not turn the power on until the rear panel is inserted into the cabinet. 5. Negligence in carrying out the above steps may cause the inactivation of the TV\\\