I have a Mitsubishi WD-62825. I turned it off a few days ago and the next morning tried turning it back on. The TV will just not power up. I think it may be a blown fuse but where would the fuse be located and is it hard to replace. I have had the back off before to assist in replacing the lamp but don't remember seeing a fuse.
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Is your girlfriend's television higher resolution? If so, the ps3 may be configured to output a signal that is too high for your mitsubishi. With the ps3 off, insert either the component or the rgb to the back. The turn on the main ps3 power switch so that the red led turns on. then hold down the 'power on' button. it will beep initially, then beep after about 3 seconds. This simply resets the output to the connected cable in a normal resolution.
If this fails go to settings>video output> and play around with the settings there. note you may have to do this on ur girlfriends tv to be able to see what you're doing...
The WD62825 has a Digital Module located on the left side of the chassis looking at it from the rear of the set. It's housed in a metal box that can slide out of its holder after removing the trim screws.
The module has its own power supply board and there are a group of 16v/1000uf caps on that board which commonly fail causing the constant flashing standby light. Further back on the module is a small board about the size of a matchbook called the E2P module. Its SMT (Surface Mount Technology) caps also commonly fail which can cause the same symptoms. Techs can tell whether the E2P has failed by simply removing it, hooking the DM back up and trying to power the set. If it powers on the picture won't be much good - but at least you can tell what's keeping it down...
Back to the caps on the pwr board. If they've failed they usually will buldge visibly on top. And ESR is almost not necessary. In any event that's the nuts and bolts on this model.
Is it a job for a layman? Yes and no - you might strongly consider a tech if you don't feel comfortable removing all the connections that the DM has with the signal board. There are about six - multi-pin - wired connections to unplug and then sliding the DM out of the unit and carefully removing the screws and latching to take the DM top cover off...
Hope this helps.