With regard to your DMR-ES35V "no read" situation, if there are grinding or scrubbing noises the problem is most likely dust, debris or oily residue on the DVD drive rubber hub. If there are loud clunking noises the problem is most likely a dirty or failed lens. See this thread for the Saint Baz hub/spindle cleaning procedure:
The following post provides a photo showing the hub cleaning and the correct far left positioning of the roller/slider prior to securing the DVD drive lid:
The photos I posted in the Saint Baz thread show the older style black plastic DVD drive used through the 2005 model year.
In the US the DMR-ES35V model entered the marketplace in April/May 2006.
I've cleaned the hub/spindle at intervals of around eight to ten months in my five functional DMR-ES35V models, three of which now have more than 3,000 recording hours per machine. In a DMR-ES35V the hub/spindle cleaning procedure takes around fifteen minutes from opening to closing the case. The Saint Baz cleaning procedure utilizes one or two cotton swabs and 91% rubbing alcohol.
The lack of video from the VHS section may be due to dirty video heads. There are a variety of wet or dry video tape path cleaners. Since you will have the machine open for the DVD drive cleaning it will add perhaps another five minutes to clean the tape path. One must be very careful with the heads found on the VHS drum. I use an alcohol dipped cotton swab to very gently roll the swab over the heads a couple of times in the same direction as the tape travels. Clean the stationary heads, guides, and rubber pinch roller as well.
If the VHS section provides no video or audio there is a remote possibility of a VHS mechanism ribbon cable or contact failure.
The Digital PCB mounted on the sub-platform under the DVD drive is the "brains" of the DMR-ES35V. This board has the main logic chips and RAM as well as the "software." Once the Digital PCB fails the only remedy is replacement as this part may not be repaired. Each Digital PCB must be specifically configured for the model in which it is fitted.
The DMR-ES35V has been the most reliable "workhorse" among my many Panasonics. I have these functional Panasonics: (2) DMR-ES30V and (1) DMR-ES40V (2005 models); (5) DMR-ES35V and (3) DMR-ES15 (2006 models); (4) DMR-EZ17 (2007 model) and (1) DMR-EZ28 (2008 model).