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Dead lcd
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Tony Volpe
Could be the atmega chip that is dead. I blew up one of mine by applying too much voltage through a stupid blunder. The main sign that something was wrong was that the LCD was blank. i could hear activity on the HF RX from the DDS at 20mhz and at 125 mhz on a VHF multimode rx. I thought the LCD might be dead but when I plugged in a new atmega chip from Hans, the whole thing came back to life. Tony G0BZB
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John Randall
Ok, I will have to get another one as well. Dont know why this one popped but just one of those things as it was ok last night but on switch on this morning, display was DOA...hi 73 John ? Digitally signed mail - M0ELS From: Tony Volpe To: QRPLabs@... Sent: Friday, 2 August 2013, 18:05 Subject: Re: [QRPLabs] Dead lcd
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Could be the atmega chip that is dead. I blew up one of mine by applying too much voltage through a stupid blunder. The main sign that something was wrong was that the LCD was blank. i could hear activity on the HF RX from the DDS at 20mhz and at 125 mhz on a VHF multimode rx. I thought the LCD might be dead but when I plugged in a new atmega chip from Hans, the whole thing came back to life. Tony G0BZB
On 2 August 2013 16:20, John Randall <m0els@...> wrote:
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Hans Summers
John I am happy to replace a dead LCD or dead DDS or dead chip.? BUT, I have to note here, that in the majority of cases where someone believes they have a dead component, it is usually something else wrong. A poor connection somewhere, poor power supply, poor something. I find when I build something, I am unconsciously remarkably unwilling to give much weight to the idea that I might have made a mistake. Usually the problem is something *I* did, not something wrong with a component!
So all I'm saying is - be really sure - then as a last resort, I can send you some replacement part! 73 Hans G0UPL
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John Randall
Hi Hans, I am quite willing to pay for another kit. My soldering is up to scratch as I have done a lot of microwave stuff and spent many years soldering from 10 yrs old to present, so I know that's good. I did recheck the soldering again and its fine. Anyone? have active pin voltages for the atmel chip and also on the DDS board? 73 John ? Digitally signed mail -
M0ELS From: Hans Summers To: [email protected] Sent: Saturday, 3 August 2013, 6:02 Subject: Re: [QRPLabs] Dead lcd
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John I am happy to replace a dead LCD or dead DDS or dead chip.? BUT, I have to note here, that in the majority of cases where someone believes they have a dead component, it is usually something else wrong. A poor connection somewhere, poor power supply, poor something. I find when I build something, I am unconsciously remarkably unwilling to give much weight to the idea that I might have made a mistake. Usually the problem is something *I* did, not something wrong with a component!
So all I'm saying is - be really sure - then as a last resort, I can send you some replacement part! 73 Hans G0UPL
On Fri, Aug 2, 2013 at 9:32 PM, John Randall <m0els@...> wrote:
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"Philip"
John
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If it's any help to your fault finding, I have a spare display and a spare chip 2.02A. If you mail me your address I can stick them in the post for you on Monday morning... Philip G4JVF --- In QRPLabs@..., John Randall <m0els@...> wrote:
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