My yamaha rxv540 remote control power button is not working, How can I open it to check the button contacts?

To perform a factory reset on a Yamaha RAV 352 remote for use with an RX-V2500 receiver, follow these steps:
1. Turn on the RX-V2500 receiver using its power button or remote control.
2. On the remote, press and hold the "VCR 1" and "ON/STANDBY" buttons simultaneously. Hold both buttons for about five seconds until the remote's indicator light blinks twice.
3. Release the buttons. The remote control should now be reset to its factory default settings.
4. Test the remote by using it to control the RX-V2500 receiver. Make sure the remote is within range and pointed towards the receiver's IR sensor.
If the factory reset doesn't resolve any issues you're experiencing with the remote control, you may need to try replacing the batteries or consider getting a replacement remote from Yamaha or an authorized dealer.
Please note that the steps provided are based on general instructions for Yamaha remotes, and there might be slight variations in the specific procedure for your RAV 352 model. Consulting the user manual for your specific remote or contacting Yamaha customer support can provide you with more accurate and detailed instructions tailored to your device.

Most remote controls use a conductive carbon paint on the underside of the button to make contact with the circuit board. The paint on the power button is probably worn out. You can get carbon or silver/carbon paint to repair it. Search for "keypad repair" to find the right stuff. I've used Chemtronics CW2605 to fix a number of items. The hard part is unsnapping the cover pieces of the remote control without breaking the locking tabs that hold it together. Just to make it interesting, some manufacturers hide a screw in the battery compartment or under the label (feel for a screw hole under the label sticker on the bottom of the remote control; if there is one, carefully cut a hole in the label over the screw hole rather than trying to peel off the label).
Chemtronics CW2605 Circuit Works Rubber Keypad Repair Kit Bdent com

Once you open the kit, it has a limited shelf life. You might as well touch up the channel and volume control buttons while you have the remote control open.

"Remote works all features except for power on or standby" Check the remote control for its infrared emission, when you press the power button on it. You can check it by using a cellphone camera. Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. Surf the site with patience.
http://remotesearch.blogspot.com/
Search the site by type in this key phrase " how to test a remote control " in its search box at the top right of the display window to get the related post quickly.

Sounds your remote need cleaning. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
One among its posts have details about how to clean a remote control.

open the r.control and clean for dirty+corrosion+oxide,+bad contacts+with contacts cleaner solvent. fix it and try again
God bless you

open the remote control, clean very well with alcohol isopropyl or another type of solver for clean contacts, remove dust, corrrosion, and fix it.
God bless you

hi i have the same problem. yamaha rx-v870 with a remote control that works perfectly except for the volume up/down. i pressed the buttons for a minute and applied some lemon gunk remover liquid and this helped for a very short period. i am wondering if the problem is with the little motor inside the receiver that rotates the volume knob itself, as opposed to an infrared problem on the transmitter/receiver.

if you can open the remote try cleaning the board this will help make the contact

the other way to test remote is a camra on phone
turn on camra and press the buttons and if you see a flashing light then that button ok try the rest

I had similar problem when setting up the YAMAHA remote control for my NEC LCD TV. At the end I found I did not follow the YAMAHA manual properly. Did you hold down the DTV/CBL button, and AT THE SAME TIME press the AV POWER for 3+ seconds? You should be able to "REMOTE SETUP OK" displayed in the front panel of the YAMAHA AV receiver. Hope this helps. BTW, only the TV POWER, TV MUTE and the numeric buttons work in my case.

There is most likely dirt below membrane preventing contact. Remove batteries, open it up, wash rubber membrane in warm water with dish washing detergent, dry it completely. Also, use some alcohol and cotton sticks to clean contact on the remote control board.