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Hi, check for any speaker switches around rear of set that may have been accidentally switched. Could potentially have a "hotel lock mode"
which some philips sets automatically entered after a set time (namely months) which limited volume settings. Your friendly local service technician may be able to help you out with that one
the color issue is most likely the crt coolant needs to be replaced you can get the phillips CRT coolant replacement kit at the following link which contains the coolant and the instructions on how to do the replacement. http://servicemanuals.vstore.ca/
The crack you hear could just be the speakers or a intermitant ground problem in the audio circuit more likely the spealers if its only on strong Bass
Is there an advanced convergence setup anywhere in the menu where the screen displays a grid? If so, you might want to get into that and move along the grid to each section that looks off. Adjust until the color falls behind the gridline, and move on to the next. It can be a time-consuming process, but should take care of your convergence issues.
You can get the repair manual emailed to you after purchase at the following link its the full service manual 2400 plus pages you need the DPTV 340 service manual in their Phillips catagory on the left side. http://servicemanuals.vstore.ca/
Change the CRT coolant in the green and blue tubes thats a comon problem with that model. You will be amazed at the results that changing the coolant will have on color, it will make it look like new again.