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AFTER powering up my QMX, I discovered the referenced short (in the assembly manual) on the power supply board with the two MOSFETs.? Even with the defective board in place, I was able to power up the radio and apparently load the firmware.? With the original board, the display would very quickly cycle through a start-up screen, frequency display and finally display that it was in Shut down mode.?I replaced Q104 and a diode.? In my efforts to repair the board, I may have damaged something else.? When my efforts to repair that board failed, Hans sent me a replacement power supply board without the referenced short.? Now with the replacement board in place, the radio will not power up.? :-(? ?Any help would be greatly appreciated.? ?Please contact me off-line at:? wf4i at att dot net.
Derek WF4I
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If you have a good 5V and 3.3V supply available I would try to power the CPU without the power supplies installed and see if it runs. If it does I would check continuity on the power button solder joints and even the power button input on the SMPS pin header to make sure the power button is actually doing what it is supposed to do.
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good morning everyone, Nic I have the same problem as Derek, I had a short on the power board between q103 and q104, having damaged the board I replaced it, the QMX only turned on for a few seconds to be detected by the PC to charge after which the hardware no longer turned on, I checked and rechecked all the soldering points with a nice big magnifying glass and I didn't detect any shorts, I don't know where the problem is, now I find myself with a non-working QMX and €100 wasted without being able to solve the problem.? Do you think it could be the power supply board that has burned out once again?? Some have said that there is nothing to be done and that I should buy another new QMX but I don't waste any more money.? Thank you and good day Giuseppe iu8eun
Il Gio 5 Ott 2023, 19:53 Nic Heath < nicheath@...> ha scritto: If you have a good 5V and 3.3V supply available I would try to power the CPU without the power supplies installed and see if it runs. If it does I would check continuity on the power button solder joints and even the power button input on the SMPS pin header to make sure the power button is actually doing what it is supposed to do.
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My observations are more than interesting.
What I learned from electronics is that if there is an error, go back to the power supply.
Power supply is an important thing for functionality.
QMX is not child's play. If it works, then everything is good, if not, then someone will help you solve the problem.
Correcting a fault remotely is only possible with your own experience and tips. But the fix is up to you.
When you run out of momentum, you give up.
More eyes see more applies in a different way here.
I see the basic problem in the fact that the power supply cannot be checked independently, because the MCU is part of it.
If the MCU is destroyed during the first poorly made assembly, then the replacement power supply panel is useless.
The problem still exists.
What can be the solution.
As I said, it's not child's play, i.e. you can't experiment with it, so if this part is not good, then I will replace it and maybe the other one will be good.
Because in the meantime, on the first occasion, the MCU already received a higher Vdd and was destroyed.
Several people gave me ideas to get started.
The measurements of K6JTH, G5CTH have helped many builders.
The precision of the parts production made us comfortable.
We accept what manufacturers or dealers say about it.
However, in many cases even a component discrepancy causes serious problems for repairers.
I'm not the one to say it, I just wrote my thoughts on the subject.
Let's use the measuring tools we have before installation.
Measure once, measure several times.
This helps a lot in the solution.
--
Gyula HA3HZ
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I have a few more observations that even experienced builders fail at.
The fibers caused by lead-free soldering often cause short circuits.
These must be patiently removed, which requires sharp vision.
...and it would be possible to list what to pay attention to.
--
Gyula HA3HZ
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Hi Gyula, since I don't have the necessary tools to understand if the processor has burned out, I would just like someone to tell me what steps to follow to resolve the problem, I also noticed that the 12v voltage arrives on the power board, but then when I press the left encoder nothing happens, the button works, I tested it, I hope I can fix it.? Thank you. Giuseppe iu8eun
Il Ven 6 Ott 2023, 10:16 HA3HZ < gyula@...> ha scritto: I have a few more observations that even experienced builders fail at.
The fibers caused by lead-free soldering often cause short circuits.
These must be patiently removed, which requires sharp vision.
...and it would be possible to list what to pay attention to.
--
Gyula HA3HZ
|
good afternoon everyone, I tried again to look for the problem on the QMX, I replaced the left encoder with a new one, now when I press the power button all the little squares appear on the display, it's already a good sign, some of you might know tell me if this is normal before loading the firmware, I also noticed that the processor heats up a little, I don't know if this is due to the fact that I powered everything at 12V and 3A.? Thank you Giuseppe iu8eun
Hi Gyula, since I don't have the necessary tools to understand if the processor has burned out, I would just like someone to tell me what steps to follow to resolve the problem, I also noticed that the 12v voltage arrives on the power board, but then when I press the left encoder nothing happens, the button works, I tested it, I hope I can fix it.? Thank you. Giuseppe iu8eun
Il Ven 6 Ott 2023, 10:16 HA3HZ < gyula@...> ha scritto: I have a few more observations that even experienced builders fail at.
The fibers caused by lead-free soldering often cause short circuits.
These must be patiently removed, which requires sharp vision.
...and it would be possible to list what to pay attention to.
--
Gyula HA3HZ
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Giuseppe--
Have you got the trim pot on the display board turned fully
clockwise? Try backing it off, 1/4 to 1/3 of a turn. You may find
it's working!
Paul -- AI7JR
On 10/10/23 06:32, GIUSEPPE wrote:
toggle quoted message
Show quoted text
good afternoon everyone, I tried again to look for
the problem on the QMX, I replaced the left encoder with a new
one, now when I press the power button all the little squares
appear on the display, it's already a good sign, some of you
might know tell me if this is normal before loading the
firmware, I also noticed that the processor heats up a little, I
don't know if this is due to the fact that I powered everything
at 12V and 3A.? Thank you
Giuseppe iu8eun
Hi Gyula, since I don't have the necessary
tools to understand if the processor has burned out, I would
just like someone to tell me what steps to follow to resolve
the problem, I also noticed that the 12v voltage arrives on
the power board, but then when I press the left encoder
nothing happens, the button works, I tested it, I hope I can
fix it.? Thank you.
Giuseppe iu8eun
Il Ven 6 Ott 2023, 10:16
HA3HZ < gyula@...> ha
scritto:
I
have a few more observations that even experienced
builders fail at.
The fibers caused by lead-free soldering often cause short
circuits.
These must be patiently removed, which requires sharp
vision.
...and it would be possible to list what to pay attention
to.
--
Gyula HA3HZ
|
Hi Peter, I still have to load the firmware, I will try to turn the quarter a little more, however I would like to understand if it is normal for the display to show the squares when I only press the encoder without the firmware being installed.? I'll try again this evening.? A thousand thanks. Giuseppe iu8eun
Giuseppe--
Have you got the trim pot on the display board turned fully
clockwise? Try backing it off, 1/4 to 1/3 of a turn. You may find
it's working!
Paul -- AI7JR
On 10/10/23 06:32, GIUSEPPE wrote:
good afternoon everyone, I tried again to look for
the problem on the QMX, I replaced the left encoder with a new
one, now when I press the power button all the little squares
appear on the display, it's already a good sign, some of you
might know tell me if this is normal before loading the
firmware, I also noticed that the processor heats up a little, I
don't know if this is due to the fact that I powered everything
at 12V and 3A.? Thank you
Giuseppe iu8eun
Hi Gyula, since I don't have the necessary
tools to understand if the processor has burned out, I would
just like someone to tell me what steps to follow to resolve
the problem, I also noticed that the 12v voltage arrives on
the power board, but then when I press the left encoder
nothing happens, the button works, I tested it, I hope I can
fix it.? Thank you.
Giuseppe iu8eun
Il Ven 6 Ott 2023, 10:16
HA3HZ < gyula@...> ha
scritto:
I
have a few more observations that even experienced
builders fail at.
The fibers caused by lead-free soldering often cause short
circuits.
These must be patiently removed, which requires sharp
vision.
...and it would be possible to list what to pay attention
to.
--
Gyula HA3HZ
|
Paul sorry I spelled your name wrong :-) Giuseppe iu8eun
Hi Peter, I still have to load the firmware, I will try to turn the quarter a little more, however I would like to understand if it is normal for the display to show the squares when I only press the encoder without the firmware being installed.? I'll try again this evening.? A thousand thanks. Giuseppe iu8eun
Giuseppe--
Have you got the trim pot on the display board turned fully
clockwise? Try backing it off, 1/4 to 1/3 of a turn. You may find
it's working!
Paul -- AI7JR
On 10/10/23 06:32, GIUSEPPE wrote:
good afternoon everyone, I tried again to look for
the problem on the QMX, I replaced the left encoder with a new
one, now when I press the power button all the little squares
appear on the display, it's already a good sign, some of you
might know tell me if this is normal before loading the
firmware, I also noticed that the processor heats up a little, I
don't know if this is due to the fact that I powered everything
at 12V and 3A.? Thank you
Giuseppe iu8eun
Hi Gyula, since I don't have the necessary
tools to understand if the processor has burned out, I would
just like someone to tell me what steps to follow to resolve
the problem, I also noticed that the 12v voltage arrives on
the power board, but then when I press the left encoder
nothing happens, the button works, I tested it, I hope I can
fix it.? Thank you.
Giuseppe iu8eun
Il Ven 6 Ott 2023, 10:16
HA3HZ < gyula@...> ha
scritto:
I
have a few more observations that even experienced
builders fail at.
The fibers caused by lead-free soldering often cause short
circuits.
These must be patiently removed, which requires sharp
vision.
...and it would be possible to list what to pay attention
to.
--
Gyula HA3HZ
|
NP! That pot adjusts the "contrast" of the LCD display. If it's
all the way CCW, it's too light, e.g. all the way off. If it's all
the way CW then it will be the opposite. I'm just hoping that
maybe the control is set for too high contrast!
Good Luck!
Paul
On 10/10/23 11:04, GIUSEPPE wrote:
toggle quoted message
Show quoted text
Paul sorry I spelled your name wrong :-)
Giuseppe iu8eun
Hi Peter, I still have to load the firmware, I
will try to turn the quarter a little more, however I would
like to understand if it is normal for the display to show
the squares when I only press the encoder without the
firmware being installed.? I'll try again this evening.? A
thousand thanks.
Giuseppe iu8eun
Giuseppe--
Have you got the trim pot on the display board turned
fully clockwise? Try backing it off, 1/4 to 1/3 of a
turn. You may find it's working!
Paul -- AI7JR
On 10/10/23 06:32, GIUSEPPE wrote:
good afternoon everyone, I tried again
to look for the problem on the QMX, I replaced the
left encoder with a new one, now when I press the
power button all the little squares appear on the
display, it's already a good sign, some of you might
know tell me if this is normal before loading the
firmware, I also noticed that the processor heats up
a little, I don't know if this is due to the fact
that I powered everything at 12V and 3A.? Thank you
Giuseppe
iu8eun
Hi Gyula, since I don't have the
necessary tools to understand if the processor
has burned out, I would just like someone to
tell me what steps to follow to resolve the
problem, I also noticed that the 12v voltage
arrives on the power board, but then when I
press the left encoder nothing happens, the
button works, I tested it, I hope I can fix it.?
Thank you.
Giuseppe
iu8eun
Il Ven 6 Ott
2023, 10:16 HA3HZ < gyula@...>
ha scritto:
I
have a few more observations that even
experienced builders fail at.
The fibers caused by lead-free soldering often
cause short circuits.
These must be patiently removed, which
requires sharp vision.
...and it would be possible to list what to
pay attention to.
--
Gyula HA3HZ
|
Guiseppe, I try to follow the construction related solutions. The initial errors were answered by Hans in message #103064, which I recommend to your attention. Read it over and over again. It is also worth reading the topic, you can gain useful knowledge. -- Gyula HA3HZ
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My contrast pot likes to be turned fully counter-clockwise. Ideal is just a hair off full left-turn stop.
Are you able to install firmware yet?
To see if the problem is the display, can try connecting terminal software to the USB. Or plug in a speaker and see what turning the tuning dial does.?
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I tried again until recently and the QMX is not detected by the PC, I don't know why, every time I press the encoder to turn it on a strip of squares appears on the display, I attach a photo to understand better, but nothing happens.? the cable works well with other devices so I would exclude it.? thanks for.? ? Giuseppe iu8eun
Il Mar 10 Ott 2023, 21:58 Rick NF6G < rdante@...> ha scritto: My contrast pot likes to be turned fully counter-clockwise. Ideal is just a hair off full left-turn stop.
Are you able to install firmware yet?
To see if the problem is the display, can try connecting terminal software to the USB. Or plug in a speaker and see what turning the tuning dial does.?
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OK, it's not what I was hoping for-- There are two rows of
characters in the display, not just one. :-(
On 10/10/23 14:36, GIUSEPPE wrote:
toggle quoted message
Show quoted text
I tried again until recently and the QMX is not
detected by the PC, I don't know why, every time I press the
encoder to turn it on a strip of squares appears on the display,
I attach a photo to understand better, but nothing happens.? the
cable works well with other devices so I would exclude it.?
thanks for.? ?
Giuseppe iu8eun
Il Mar 10 Ott 2023, 21:58 Rick
NF6G < rdante@...>
ha scritto:
My
contrast pot likes to be turned fully counter-clockwise. Ideal
is just a hair off full left-turn stop.
Are you able to install firmware yet?
To see if the problem is the display, can try connecting
terminal software to the USB. Or plug in a speaker and see
what turning the tuning dial does.?
|
Good morning everyone, Rick I haven't installed any firmware yet, I don't want the QMX USB socket to be faulty, but what software do you mean to install. Giuseppe iu8eun
OK, it's not what I was hoping for-- There are two rows of
characters in the display, not just one. :-(
On 10/10/23 14:36, GIUSEPPE wrote:
I tried again until recently and the QMX is not
detected by the PC, I don't know why, every time I press the
encoder to turn it on a strip of squares appears on the display,
I attach a photo to understand better, but nothing happens.? the
cable works well with other devices so I would exclude it.?
thanks for.? ?
Giuseppe iu8eun
Il Mar 10 Ott 2023, 21:58 Rick
NF6G < rdante@...>
ha scritto:
My
contrast pot likes to be turned fully counter-clockwise. Ideal
is just a hair off full left-turn stop.
Are you able to install firmware yet?
To see if the problem is the display, can try connecting
terminal software to the USB. Or plug in a speaker and see
what turning the tuning dial does.?
|
Guiseppe,
I see you don't read the messages.
If you read it, you don't understand it.
This will make it difficult to move on.
If there is no one nearby to help you, you will have to solve and operate the device yourself.
+50 USD would have been a solution, then you would have received a pre-assembled device.
I don't have a device, but I'm interested in how it works, so I read it and try to understand how it works.
From a distance, it's hard to see where you went wrong or what the mistake is.
The solution lies with you.
It is up to you to decide how to proceed.
We are only trying to describe the possibilities.
We don't see the specific thing, so every entry is just a possibility.
--
Gyula HA3HZ
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ps.: From your photo, I can see that you are working well. Now put the panel aside and read it several times to understand what is written.
Then when you are calm and relaxed, take it out and try to start the smoke-free installation.
--
Gyula HA3HZ
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Good morning Gyula, thanks for the advice, after 2 QCX MINI and 2 U3S built and went well on the first try with the QMX I'm having difficulty, I don't read all the emails that arrive, I sometimes wrap them in the bin because more than 30 arrive a day, I reply when I can because I'm working and when I'm at home I have many other things to do, here my time available for repairs is limited.? I'll try to do what you recommended, then I'll let you know. I want to check the USB C socket first to make sure there are no problems.? Thank you and good day. Giuseppe iu8eun
Il Mer 11 Ott 2023, 09:18 HA3HZ < gyula@...> ha scritto: ps.: From your photo, I can see that you are working well. Now put the panel aside and read it several times to understand what is written.
Then when you are calm and relaxed, take it out and try to start the smoke-free installation.
--
Gyula HA3HZ
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turning the trimmer anti-clockwise to the end and a little more to adjust the display the second row of squares comes out, all I have to do is test all the connections of the USB socket. Giuseppe iu8eun
Good morning Gyula, thanks for the advice, after 2 QCX MINI and 2 U3S built and went well on the first try with the QMX I'm having difficulty, I don't read all the emails that arrive, I sometimes wrap them in the bin because more than 30 arrive a day, I reply when I can because I'm working and when I'm at home I have many other things to do, here my time available for repairs is limited.? I'll try to do what you recommended, then I'll let you know. I want to check the USB C socket first to make sure there are no problems.? Thank you and good day. Giuseppe iu8eun
Il Mer 11 Ott 2023, 09:18 HA3HZ < gyula@...> ha scritto: ps.: From your photo, I can see that you are working well. Now put the panel aside and read it several times to understand what is written.
Then when you are calm and relaxed, take it out and try to start the smoke-free installation.
--
Gyula HA3HZ
|
HA3HZ
Paul - AI7JR