Johnson Newer 5100-Display Blank after self-test/TX-RX fine

[elyps]

Here's my personal radio puzzle I'm hoping to get a little help in solving: I have an EFJohnson VHF 5100 now out of warranty that works fine TX-RX on Conventional/Trunking/Digital but the display goes BLANK after self-test. Radio powers on and shows that the LCD is fine with the EFJ logo and version info & self test shows...and then display goes blank. Buttons all work, backlight works, power hi-low works, read and write codeplugs without issue. I've tried starting with a new codeplug from scratch with PCConfig and it does the same thing as my pre-existing codeplugs: blank display. The guy who knew more about this radio as previous user/owner claimed that this problem started after doing a programming change, but couldn't elaborate. Current 5100 Details: File format ver 5.8 DSP Software Ver 4.4.1 Controller Ver 4.4.4 Hardware Rev NA Boot Load Ver 4.2 SEM Ver 3.4 Model 242-5117-660GS4 SN 5110F210xx xxxxx I've programmed this radio and another identical model number radio with PCConfigure V.1.28.0.8 & other identical radio has no such problem with the display. I have PCConfigure 2.10.2 for another band radio but said version of PCC won't let me load a new codeplug into this 5100 without pushing the firmware up to 4.14.4. Anyone happen to have any thoughts to share in my getting the display working after "self test?"...Many Thanks!

[Intrinsically Safe]

Sounds like the display driver is crapping out (is it running windows? ) between the hand off from boot loader to controller code. I could only recommend updating to the latest firmware and see if they have fixed something with code. I have seen this a handful of times but cycling power would clear it and would never see it again...

I.S.