Finally I have got a replacement for the contrast and Ambilight buzzer. These are the obvious facts: ROM version: Jan_18_2005_TX21EU-2.3_08781 Fbx version: 310431707610 same version as the old one SW version EPLD: 310431707860 same version as the old one Production batch: 1H0508 indicates week 8 2005 The only differences I have found up to now between ROM version 2.1 and 2.3 remembering version 2.1 are: 1. The buttons of the on-screen menus seem to be a little bit faster now 2. Video text does not zoom over the whole screen now. There is a black vertical bar on the left and right side of approx. 3 left black. The contrast is set to a dark level which is audible. The maintenance menu shows repeatedly the following error despite of resetting the error buffer. This has not happened with the old one. Errors: 003 000 000 000 000 Defective Module: Feature Box Does anyone know what that means? Further info from the maintenance menu: Screen: 32inch LCD Sharp Now back to the major question: What happened with the contrast and Ambilight buzzing? Well something but it is not 100% vanished. Contrast 100 97 ok Contrast 96 78 slight dark buzzing Contrast 77 74 slight lighter buzzing Contrast 73 0 slight dark buzzing Audible? Yes directly in front of the LCDTV and listening behind the back. The contrast buzzing is audible below 97 in 10f distance due to wall reflections of the buzzing noise. The Ambilight still buzzes slightly and can be clearly heard near the LCDTV but can be hardly heard in a distance of 10f. The buzzing of the old one got louder during operation and was considerably louder than the new one but the new one is still not buzzing free. The picture quality of the new one seems to be not on the same level like the old one. The overall picture looks brighter. The magic Luma gain switch setting from 1 to 0 has no considerable effect compared to the old one regarding the backlight. Setting it to 2 increases the backlight. Black seems to be not as black as with the old one. The TV quality seems to be a bit lower with the new one in comparison with the old one. The impression is very similar viewing DVD through DVI-D. The picture quality is not better or equal. It seems to be not on the same level. Not as good as the old one. For me it is very hard to describe but I think it has something to do with the contrast black level adjustment. Black looks a little bit brighter now. Should I be satisfied with the replacement now? Tell me!