The problem is a cold solder joint on a trimmer capacitor, C1022, on the 706MKIIG. Similar problem occurred with earlier models. The trimmer is on the Main Board about 5/8 inch to the right of the lower optional filter and 1 1/4 inch from the edge of the board. If you press down on the contacts of the trimmer one at a time you can find out which contact is causing the problem. Heating the contact with a sharp tipped soldering iron temporarily fixed the problem for me. I had to go back in and add a tiny bit of solder for a permanent fix. Go to http://www.uksmg.org/content/ic706_fix.htm for a picture of the part on the earlier MK1 model of the 706.
You need to be a very good technical person with electronics to work on these. The issue is most likely a PLL board issue. You need to be able to troubleshoot to the component level. The service manual appears to be https://www.manualslib.com/manual/738448/Icom-Ic-706mkiig.html
SOURCE: insignia digital tv converter/indoor antenna no signal
I had the same problem but realized that when it said NO SIGNAL,,,,it just ment for that station,,,,,switch channels and they will start to come in,,,
Good Luck,
charh20
SOURCE: I bought HDTV/UHF/VHF/FM INDOOR PASSIVE
Is the antenna the correct one for your environment? Do you have the antenna pointed at the stations you want to receive? Use antennaweb.org or tvfool.com to get an idea of the location and likely channels you can receive at your location. Antennaweb assumes an outdoor antenna but is very conservative in the list of channels you can receive. (These may match the limits of the indoor antenna.) TVfool lists the stations and the appropriate antenna that will likely receive each station.
Tall trees and buildings will block the signal. Get the antenna as high as possible. Move the rabbit ears and UHF loop to maximize your signal strength. Then make sure the TV is set to use the OTA tuner (ATSC for digtal stations). (That may mean changing the source in the setup menu.)
Then scan for channels. Move your antenna or parts of it and rescan or edit the channel list. (For some TVs there is a weak signal setup option that will let you manually enter the station number (including sub-channel). Then it will provide the signal strength information as you move your antenna.)
I hope this helps. An amplifier may help you bring in weak stations with enough signal strength for the tv to see them.
Cindy Wells
SOURCE: NO variable power on FM,or SSB, but variable works ok on AM
Look for open resistors near by, if the 2SC1969 shorted it has taken out one or two parts, also check for open foils on the printed circuit, beyond this a circuit diagram is needed.
Check with ICOM on their web site or with HAM RADIO OUTLET, a large chain in North America---you may find a source that ships overseas or even one in Manilla.
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