Re: QCX: top row blocks on display, but CPU responds to ISP #avr #display #troubleshooting


Andrea Massucco IZ1IVA
 

Il giorno 24 giu 2021, alle ore 05:03, VK5EEE <vk5eee@...> ha scritto:

Did you try swapping out the IC2 for one where the display is good? I did that and the display worked again as it also got the row of blocks on the top, but, the RX has also gone. Both RX and display were fine, this is a neewly constructed QCX-2017-v-2, all was good except TX which blew earlier. In its Baumatech case, running for weeks on RX with no issues (and not TX), from one day to the next on power up there was the blocks along the top. Normally this one required starting twice to get it to power up (old bug, which hasn't been fixed on this model), but this time no, just blocks on the display. Swapping out IC2 from another QCX brought the display to life, but no RX!
Dear Lou,

I’m in that EXACT, WORD-BY-WORD, XEROX-COPY situation: same year, same case, same sudden death, same silent RX, same blown and replaced finals!
I believe we’ve found a pattern, but unfortunately I’m unable to test a second IC2, as I haven’t got one.
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73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net



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73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net

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