- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
First thing to try is while the phone is in "On-Hook" mode, press the up key on the handset several times, you should hear a beep each time you press the button and the display should show "Ringer Volume" with a graduating series of bars. If the display shows as above, but you do not hear any rings, try pressing the "Speaker" button and listen for the dial tone. Most of the time on these phones, it is a simple matter of turning up the ringer volume, but sometimes, the handsfree speaker (Which also acts as the ringer speaker) goes bad. If the speaker is bad, it is a fairly easy replacement if you are handy with a soldering iron.
nfleurat, If nothing wrong with the "on"/"off" switch, then must be the "switch-mode-power-supply"/"CCFL inverter supply" circuit card inside of unit. Look for a possible "thermally intermittant solder connection" and then resolder it. Also, inspect unit for possible "swollen" electrolytic filter capacitors on power supply board. Read more of my responses to other owners in my FIXYA profiles for more options you can use to solve your LCD display problem. 12fixlouie aka louie12fix Good luck on the repair.
Certain circuits go through the ignition switch and sometimes the points in the switch become gummed up with carbon. The easiest fix is to replace the ignition switch. The switch can, however, be disassembled and cleaned by a skilled mechanic (there are many small springs and parts that have to be assembled properly).
My N72 (Nokia) phone’s display shows blank when switched-ON. Blank in the sense means that the display lights are ON, but no images in the display. Sometime the dispay comes and goes. In addition, the phone is not ringing or can’t make calls. Can anybody help me?
what you're saying it can be 3 possible case
1.its the backlight that have problem and I give it 90% to your problem.The behavior of spoil back light sometime you can use and sometime you can't if you tab the switch that mean you power off the light and after that you power on it again so this will work for 1-2 second
2.Bad inverter or bad chip on that inverter this always happen but like this case sometime after switch, you can use for nearly a week or two. so I give it only 40% for your case.
3.Its the lid actuator but you already push it up and down already and still the same.and also when you push it down and up the light turn on...so I think this is working fine.
Here is a link to the operating manual which may help. http://service.us.panasonic.com/OPERMANPDF/KXT7720.PDF
with strange anomalies, it is sometimes best to clean the system.
Suggest you go back to factory default settings by unplugging each phone for about 10 seconds then re-connect. also with main phone switch off power for 10 seconds and switch back on.