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Check if the fast forward button is more inside than the rest of the buttons. May be its stuck in the ff position. After all they were just micro switches below the plastic buttons strip. The specific ff micro switch may be stuck, if I were you I would try some switch cleaning spray to loosen it. But be prepared that the control ic is busted.
i had the same issue with my ag-dv2000, a fun problem to solve without a service manual. first verify we are dealing with the same issue.first open hopper fully and apply power. you should get an f06 error(failure to close in required time), now close hopper and apply power, you should get a f07 error (failure to open in required time). if this is the case the bad part is the motor drive ic. ic 1 on the motor drive board mounted to bottom of dv mech. it is a 10 pin ic labeled xra6887. i have not located a source yet but you can confirm the chip is bad by replacing it with ic6502 on the same board. if you put the bad chip in place of ic 6502 you will ground power supply and will not have power, leave it out. it controls threading motor, not needed to verify problem. the door should work now. dont put in a tape untill you replace bad chip. if you find the panasonic part number for this part please post it. happy desoldering!
Have a look around inside for something that looks like this:
It's a memory retention capacitor and it's used to store a charge which will keep an IC with power when the device is not connected to the mains. When they go the effect is the same as what you say is happening. They often have only that 5.5 volt rating so are easy to spot compared to normal capacitors. They are not expensive either!
Yes it will most likely be the remote sensor on the VCR. If you find where the actual point of entry for signals from the remote control, you should be able to trace the circuit back to the pc board. You should find an IC, chances are it's failed. Of course it could be the sensor itself, but I doubt it. If you put the IC number into Google, you should be able to find out the cost and other details, also if it still is made!
i-link ic might have blown due to back voltage spikes to it from computer through the cable. check with a service centre and replace the ic if faulty. otherwise i link cable or connector may be faulty. be in mind that never connect or disconnect i link cable while mechine is connected to power ( even in OFF condition also).
1) Power to the display is missing (check the power suppy and the pins of the display itself for poor/broken solder connections).
2) Display driver IC defective
3) Main CPU not sending info to display IC.
Were there any other symptoms prior to the display stopping? If not, check for the connections at the display itself first and update this with the results. I'll look up the service manual in the meantime to check for other posibilities.
Sounds like a blown fuse. If the fuse is ok, then the power supply is completely dead, probably blew out the power IC. You should at least be able to get the tape out by simply manually turning the tape deck motor until the tape releases and exits the machine. It isn't always easy and can take a while to do if your turning it by hand, but it always works.
I you know how to use a multimeter then you can check to make sure the power supply is good by measuring the DC voltages on the regulator IC's and pluges. you will most likly need a service manual for this and it may not even be worth getting a manual as a good new VCR these days is only about 35 bucks and a manual could cost as high as 25 to 30 in most places.