Is the F segment out in display 3 too? Check the resistance of R-47 on the display driver board.
(Topic ID: 222166)
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If display #3 is working correctly then you have a bad connection on the display board. This bad connection will be after R-47. After R-47 this signal splits and goes to both #3 and #4. Somewhere after the split there is a poor connection. I would start with reflowing pin 39 on #4 display and then retest it.
4 months later
Quoted from h8breed01:Ok, I have almost the same issue, but both display 3 and 4 are missing "f"
Since its both displays are missing "F" I would check for the signal at the start. J-5 pin 3 on the display board, check it with a logic probe. There should be pulses when the F segment should be on.
Quoted from h8breed01:I have pulses when f should be on, and the go off when I cycle through and f should be off.
And this is at J-5 pin 3, correct. Then repeat the test but check U-11 pin 10 for pulses when the f segment should be on.
Quoted from h8breed01:but both display 3 and 4 are missing "f"
Since its the lower displays not showing the F segment then it would have to be U-11 or U-9, U-15 would be for the upper displays.
Quoted from h8breed01:I realized I didnt check r47... because I cant find it on the system 11a/b display I have.
Do you have a early or late display board?
1 week later
1 week later
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