FT-857,comes on for about 5seconds, than goes off, unplug the power plug and reconnect, does same thing , comes on for about 5 seconds and goes off

Remove vent grille, then remove control panel. Check wire to cavity thermostat. Sometime wire bundle and small space causes poor terminal connections on this thermostat and will burn wire terminal. Cut off bad part of the wire, install a small terminal end, reconnect to thermostat. If thermostat is destroyed, also replace thermostat.

https://www.eham.net/ehamforum/smf/index.php?topic=65138.0

follow this link and follow all the steps

http://www.hampedia.net/yaesu/ft-857-second-menu.php this link lists the settings to put back to factory abc together when switching on to access

Hi,

Computer turns on but no display. This issue is commonly caused by electrical static on the motherboard. Try doing a power drain.

If this computer is a laptop:
1. Turn the computer off by pressing the power button for a bout 5seconds.
2. Take the battery out of the computer.
3. Unplugged the ac adapter.
4. Press and hold the power button for about 30 seconds. (without any power source)
5. Put the battery back in and plug the ac adapter back into the computer.
6. Turn the computer back on.

If this computer is a desktop:
1. Turn the computer off by pressing the power button for a bout 5seconds.
2. Unplug the power cable from the computer.
3. Press and hold the power button for about 30 seconds. (without any power source)
4. Plug the power cable back into the computer.
5. Turn the computer back on.

Thank you for choosing FixYa! have a good one!

F3H Humidity sensor failure 1. Unplug microwave oven or disconnect power.
2. Connect a new sensor to the board (at P5).
3. Plug in microwave oven or reconnect power.
4. If no failure code appears when starting sensor function:

Unplug microwave oven or disconnect power.

Replace old sensor.
5. If failure code appears when starting sensor function:

Unplug microwave oven or disconnect power.

Replace power supply board.
6. Plug in microwave oven or reconnect power.

I have a cello tv model no E1906DVB the on and off light just keeps going from red to green and wont switch on

Sounds like the digital board needs replaced.

Most proably it is a main board problem. Contact authorized service center.

IF you would like help diagnosing your set. Go to the enclosed link. They have the service manual for your set and offer unlimited chat support for only 29.99. Just click on your sets manufacturer and you will see your model. Then click on the contact us link and provide your email address and they will email your manual and instructions on how to obtain your support. I am one of their techs. This manual contains step by step procedure for troubleshooting Your RCA DLP Light Engine
http://servicemanuals.vstore.ca/

The first thing in this unit is to check the ribbon cable that goes from the front control panel to the back ssb board, I would unplug and replug to make sure seated properly. Then try it again. There are alot of screws to take out but worth it if this solves the problem.