Panasonic PV-L557D vhs-c camcorder wont stay on

You could get it repaired at an authorised Panasonic repair shop.
Not the sort of repair a layman can undertake.

Hi Sounds like there is moisture inside. Have it checked and cleaned by a repairman. Good luck.

THE SENSOR SWITCH FOR CASSETTE DOWN NEEDS CLEANING OR REPLACEMENT.you can spray it with a video clean spray it's location is under the tape when is down on the upper right angle.

Eject the tape. Leave the tape carriage open. Power the unit off and tent it with a light linen cloth for about 20 minutes in a warm but obviously low humidity area. Emergency/ short time approach: Clean hair blow-dryer. Set for warm/low heat. Turn on and "wave" the warm air into the tape mechanism section about 18 to 12 inches away from the camera's open gate/door. Bake for 3-5 minutes..

como puedo solucionar el problema (how can I solve the problem)

it does have fuses and are located inside they kinda look like resisters and are most likely the problem

I have the same problem with my PV-DV103. Panasonic wants more to TRY and fix it than the camera cost new. MY advise can the camera and buy one without the DEW option.
Thats what I am searching for presently . If the manufacturer says the camera has a dew indicator in the circuit - buy elseware.

oh, just found out this is actually normal, it switches to stand-by mode automatically, but my cam only stays on for 18 seconds wen a tape is in, and it wont record or playback...

This is actually a problem with the ribbon cable. When the tape is put in and the tape door is pushed shut it jars the internal ribbon cable. Years ago I found this tip online & it fixed it!

Quote
"Ok, here goes, I had the exact same problem on my pos Panasonic pv-dv203d. After many times of taking it apart and many frustrating calls to Panasonic, I've finally figured it out, I hope it helps on your cameras.

Remove the bottom plate from the Camera (four screws, plus one near the LCD screen).

Pop off the bottom plate of the camera

Look at the ribbon cables carefully, and make sure they are all snug in the plugs. The tape transport mechanism may move them out of place."

Every now and then our will start to act up & hubby unscrews the bottom of the camcorder (Panasonic PV-DV203D), gently maks sure the ribbon cables are in place, replaces the bottom plate & it's worked for us every time. i hope this helps!

You would have to replace the dew sensor which is a device in close proximity to the video head which shuts down the camera to avoid damage when moisture is detected at a high level inside the camera. Sounds like your sensor has changed values and triggers at too low a level. If you are not familiar with this kind of technology you should take it to a repair shop. The repair should be less than $100 US. Two websites which give free estimates are http://www.camcorderrepair.com and http://www.videotech.com Good luck.