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@betwixt:I do not think that RAM chip swapping will help. Those RAM chips has 8 bit data bus and together they form 32 bit data bus for CPU to read/write that 32 DWord (Double Word) format data. So, I think that CPU checks if that written 32 DWord is the same as it is read - to check that ALL...
I can check the booting (process) via COM port but ONLY if all 4 RAM chips are working. Yes, those 4 RAM chips form a complete DIMM like memory module.
If any of those 4 RAM chips is faulty the device will not start booting and I can see nothing as output (on COM port)
So, I would need to...
What hardware test should I use to find out a faulty memory chip in DIMM module?
My understanding is that if any RAM chip ( used in DIMM ) is faulty then the DIMM is considered ( by the system that uses that DIMM) to be faulty .
I can replace ALL RAM chips on the DIMM but it is not what I...
For my project I need to set up a temperature profile but the profile should NOT start from an ambient temperature ,that can be as low as 20°C , but from a higher temperature, for example from 150°C.
Also it should finish at that temperature 150°C.
Will I need two PID controllers or one will be...
I need to read/write NAND flash chips( only from time to time as a hobbyist) . I was thinking about a development board, where I would replace NAND flash chip with a SMD TSOP48 socket( yes the NAND chips I work with are for this socket only).
I will insert a NAND into this socket and will read...
Has anyone tried to make a DIY device that works like a hotbar bonding machine?
I need only from time to time to change FPC( flexible printed circuits) on LCD ,using ACF( anisotropic conductive film),
so spending about several thousand USD on that machine is not good for me.
I wonder how the flat cable is connected with the glass screen in the picture below? I red circled it.
What working process is used? Soldering , using glue or another procedure?
Anyone knows?
Thanks
Thanks for the reply
Check is there proper and continuous voltage on board.
I do.
Inspect electrolityc capacitors on board.
Yes, I do
How do you check BIOS?
With oscilloscope
Did you inspect PCB and other small smd parts visualy?
Also under microscope
How do you check cpu if "does NOT work...
I check BIOS and it works.Also CPU seems to be working.Only problem seems to be either SDRAM or a PCB fault.(e.g. paths from CPU to SDRAM).It is Dreambox 800 PVR satelite receiver equipment. Do you have any idea? Thanks
From time to time I must repair a Linux embeded equipment that has its own BIOS, CPU and SDRAM.
This SDRAM has 256MB together and consists of 4 SDRAM modules(IC).
Sometimes equipment does not work.Then there are several possibilities for that.
Faulty CPU or BIOS or SDRAM.
Is there a method how...
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