JYE Tech Forum

I have proper power and backlight on screen, I can see the symbols at the bottom of the screen but I only have a black square in the middle when contrast is adjusted

as in scenario 2nI have 5V at test point 1 with or without JP4 closed but no proper voltage beyond that. The test results were: with j1 & J2 closed 5v at VBUS, 5Vdc at +5 chk left of sw12, .11vdc at Y1 pin 23, .11vdc at c 21 & C22, .54Vdc at J5 +5 test point .5vdc at LED. These have been my ...

I closed JP4 up until you had me close off the other just for troubleshooting. It did not change anything with the test results so I have waited your reply. It is closed now. Nobody ever replied about the board inserts touching. I have never had correct power from the beginning when I followed the s...

No JP4 is open

I am going to give you 2 scenarios both powered by the USB. first with J1 & J2 open the Vbus has 5vdc, 0vdc at +5 check spot left of sw12. .14vdc at y1 pin 23, .13vdc at c21 & 22. .5vdc at J5 +5 check pt. with j1 & J2 closed 5v at VBUS, 5Vdc at +5 chk left of sw12, .11vdc at Y1 pin 23, ....

was working fine then power button quit locking in on position now no pwer to unit. what is the type of this 6 pin switch? I have not seen one searching the internet.

no low voltage after first +5 power check point for initial power-up test.

Nothing on the screen. The LED does not blink for the second step test. I cannot get it to pass the power up tests so I have not soldered in the screen at this point. should I solder the body of the crystal to the contact or just the leads as I have done?

I get proper power at the first check spot butlow voltage to Y1. I have verified all the solders are through the multi-layered board. I noticed that the brass inserts on the board between R1 and C4 are touching is that a manufacture error that is causing me problems?