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Hi guys, help needed again please? After replacing the finals in my sBitx v2 and powering on sees no action? the l.e.d.s inside are flashing etc but no power on screen? is there a fuse or something I have missed? I checked the power IRF4905 mosfet but seems to read ok? regards Owen G0RCL
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Did you plug the the little power lead back into the display? It sounds like no power to the display.
Joel
N6ALT
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Thanks and yes I did Joel, the two pin plug and also the?other two and three pin plug and 10 pin to the potentiometers. I checked and double checked but can't see anything obvious. I made sure the?finals were well soldered?and the heatsink bracket was?good etc. I just wondered if anyone else has had this, so I can just put my?finger on without delving deeper into testing etc? Owen
On Fri, 18 Aug 2023 at 17:25, Joel Caulkins/N6ALT < caulktel@...> wrote: Did you plug the the little power lead back into the display? It sounds like no power to the display.
Joel
N6ALT
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Check if the SD card is in place. You have to see this from the inside. -- Gyula HA3HZ 
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ps.:? When you replace the Fets, you first disconnect the front panel from the pcb and back panel.
Then you have to disconnect the connectors on the pcb and remove the flat wire from the socket for the display.
By loosening the small black conical elements (bottom and top) on the socket to the right.
Now check this as well, whether you pushed it back so that the wire is firmly in contact with the connector.
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Gyula HA3HZ
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Yes, they were all put back snuggly.
On Fri, 18 Aug 2023 at 19:29, HA3HZ < gyula@...> wrote: ps.:? When you replace the Fets, you first disconnect the front panel from the pcb and back panel.
Then you have to disconnect the connectors on the pcb and remove the flat wire from the socket for the display.
By loosening the small black conical elements (bottom and top) on the socket to the right.
Now check this as well, whether you pushed it back so that the wire is firmly in contact with the connector.
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Gyula HA3HZ
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You will find a bad connection or a bad soldering where continuity is interrupted. Replacing the FET does not cause problems at departure.
I remember it is easy to skip the wrong place and accept it as good. It will be a banal mistake, I think.
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Gyula HA3HZ
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Check and see if there is a pattern on the LEDs coming from the raspberry pi. ?Those can be diagnostic and there are lists of what they mean. ?If there is a pattern that might help you?
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On Aug 18, 2023, at 14:52, HA3HZ <gyula@...> wrote:
?You will find a bad connection or a bad soldering where continuity is interrupted. Replacing the FET does not cause problems at departure.
I remember it is easy to skip the wrong place and accept it as good. It will be a banal mistake, I think.
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Gyula HA3HZ
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Thanks Gordon, there just seems to be a random flashing of the green led for a while, while the reds are on? Then after a short while the green stops, but still no display. I have looked through the manual and there doesn't seem to be any faults procedure?lists anywhere? Owen de G0RCL
Check and see if there is a pattern on the LEDs coming from the raspberry pi.? Those can be diagnostic and there are lists of what they mean.? If there is a pattern that might help you?
Gordon KX4Z? On Aug 18, 2023, at 14:52, HA3HZ <gyula@...> wrote:
?You will find a bad connection or a bad soldering where continuity is interrupted. Replacing the FET does not cause problems at departure.
I remember it is easy to skip the wrong place and accept it as good. It will be a banal mistake, I think.
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Gyula HA3HZ
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Owen, I can't tell from the photo - do you have the new FETs insulated from the heatsink still?
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Mike - kb2ml
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Hi Mike, yes they are installed, and they went in place, just the same as the old ones came out etc, I have gone by the book. I am not a novice, I?know what I'm doing, regarding soldering etc. Just can't seem to find out why the screen won't turn on, so I can?bios them properly,?I have checked all connections etc? G0RCL?
Owen, I can't tell from the photo - do you have the new FETs insulated from the heatsink still?
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Mike - kb2ml
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I'm worried that this sounds a lot like what happened to me when the raspberry pi V4 was damaged.? ?When I replaced it, it damaged the next one also.? ?
I would encourage you to very accurately measure the supply voltage to the raspberry pi and report that here.? ? I never figured out what blew mine.
I don't know if that is what is happening for sure.? ? I'm just telling you the best that I can.? ??
Gordon KX4Z
Hi Mike, yes they are installed, and they went in place, just the same as the old ones came out etc, I have gone by the book. I am not a novice, I?know what I'm doing, regarding soldering etc. Just can't seem to find out why the screen won't turn on, so I can?bios them properly,?I have checked all connections etc? G0RCL?
Owen, I can't tell from the photo - do you have the new FETs insulated from the heatsink still?
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Mike - kb2ml
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If I were you, I would disconnect all the connections again and again.
It may happen that, for example, your ribbon cable is slightly crooked or the SD card connector is faulty.
These are all just tips and the solution is up to you.
A workplace memory is that a well-working professional always skipped over the place of error, he considered it good.
When my boss looked it over, the fault was revealed. More eyes see more.
ps.: put it aside and you will find the reason when you relax.
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Gyula HA3HZ
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Show quoted text
On Aug 19, 2023, at 03:16, HA3HZ <gyula@...> wrote:
?If I were you, I would disconnect all the connections again and again.
It may happen that, for example, your ribbon cable is slightly crooked or the SD card connector is faulty.
These are all just tips and the solution is up to you.
A workplace memory is that a well-working professional always skipped over the place of error, he considered it good.
When my boss looked it over, the fault was revealed. More eyes see more.
ps.: put it aside and you will find the reason when you relax.
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Gyula HA3HZ
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If you have a spare microSD card, I would try that as well.
Joe VE1BWV?
Good advice! On Aug 19, 2023, at 03:16, HA3HZ <gyula@...> wrote:
?If I were you, I would disconnect all the connections again and again.
It may happen that, for example, your ribbon cable is slightly crooked or the SD card connector is faulty.
These are all just tips and the solution is up to you.
A workplace memory is that a well-working professional always skipped over the place of error, he considered it good.
When my boss looked it over, the fault was revealed. More eyes see more.
ps.: put it aside and you will find the reason when you relax.
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Gyula HA3HZ
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On Sun, Aug 20, 2023 at 02:05 PM, Joe wrote:
If you have a spare microSD card, I would try that as well.
?
Joe
VE1BWV?
Good advice!
?
On Aug 19, 2023, at 03:16, HA3HZ <gyula@...> wrote:
If I were you, I would disconnect all the connections again and again.
It may happen that, for example, your ribbon cable is slightly crooked or the SD card connector is faulty.
These are all just tips and the solution is up to you.
A workplace memory is that a well-working professional always skipped over the place of error, he considered it good.
When my boss looked it over, the fault was revealed. More eyes see more.
ps.: put it aside and you will find the reason when you relax.
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Gyula HA3HZ
Joe, he already solved the problem, he just opened another thread with the same name and described the solution there. ? -- Gyula HA3HZ
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Joel Caulkins/N6ALT
HA3HZ