Note: I’m not marketing any sort of kit or “upgrade.”
My priority is doing repairs.
I offer this option for repairing faulty backlights.
My service is for customers/end-users only, not other shops.
The entire radio must be sent in for service, not just the front-panel.
My priority is doing repairs.
I offer this option for repairing faulty backlights.
My service is for customers/end-users only, not other shops.
The entire radio must be sent in for service, not just the front-panel.
![756 756](https://www.nu9n.com/images/756pro.jpg)
Describe your experience with the ICOM IC-756 Pro III and tell us why you give it the rating you did (required). Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. RADIOHF - For Sale: ICOM 756 Pro III I have for sale my little used rig, 756 Pro III. It is in like new condition with less than 50 hours of transmit time. I have already had the driver transistors replaced which can be a problem in some Pro III's. Full output on all bands. I have the original manual, spare plug and fuses and original box. The Icom 756 Pro III was the last member of the venerable '756' family that started with the 756, 756 Pro, 756 ProII. This latest version offers some incremental improvements over the previous 756 Pro II.
April 2018: I’m now able to convert backlight circuits from CCFL to LED in the following radios:
Icom 756 Pro Iii Serial Numbers 1
If the original circuit is in bad shape, or the CCFL tube is very dim, I can replace the CCFL tube with a 12-volt LED strip. (Scroll down to see pictures.)
- I add a simple circuit (shown below) that allows the rig’s dimmer function to work as intended.
- No inverter or regulator circuits are used. So there are no RFI issues, and there are less components to fail.
- A regulator circuit is not required. The original CCFL driver circuit was not regulated, nor does the LED circuit need be. (If you experience flickering while transmitting, you likely have marginal supply voltage, or voltage loss through your DC power cable.)
- The circuit is so small, it can be built inside the original CCFL circuit’s shielded enclosure. But I find it best to mount the components on the back-side of the circuit board, where they can be easily accessed, without having to remove the board.
- The LED strip is a cool-white type, so the display looks as close to original as possible.
- I use the Flexfire UltraBright Slim Series LED strip, which is only 3.5mm wide, and fits perfectly in the IC-756PRO series displays.
- In the IC-746/PRO displays, there’s a wider opening, so I add a spacer.
- The IC-746/PRO series requires 3 sections of this LED strip. And the IC-756PRO series requires 7 sections.
(Update: I now use BD437TG instead of 2N6121.)
Incredimail 2.5 7. IC-756PROII with LED conversion at 100% brightness:
IC-746 with LED conversion at 100% brightness:
Comparison of an original Pro2 CCFL tube (bottom) and a new LED strip (top):
Icom 7600
An LED strip all lit up: