I bow to greater knowledge but I bought a logic analyser specifically to investigate a fault on a M68K embedded board.
I needed to be able to see all the address, data and error lines on the board at the same time to see what was causing a 'HALT' exception on the processor. It would appear to me that having a 32CH logic analyser gives a better view of a microprocessor PCB than jumping around with a scope or logic probe. I do have several HP LogicDart's but with only 3 channels each it seemed daft to use them on a 16 bit bus.
I bought a Hantek 4032L and I am pleased with what it has to offer me by way of bus visibility. Stuck bits would be easily spotted and the HALT on the MC68K stops changes to the busses so I should be able to correlate a set of events with the HALT event. Most likely a dual bus error (BERR) event. I can then step along the bus looking for the IC that should have handled the request for action and did not respond correctly.
This is all theoretical as I have yet to find a decent amount of free time to get stuck into the problem. The 'Patient' is a $10k FLIR thermal cameras high density PCB's and access to the various areas of the MCU pcb is made challenging by the stacking of other essential PCB's on it.
The Hantek cost me ~$200 and, for a repair tech, it appears more than capable of the task and very useful. A bit like having a 32 channel oscilloscope with 400Ms/s sampling rate. Of course the scope is still needed to track down logic level errors or noise on logic busses. As a side note, a new PCB for my FLIR is US$4000 + it must be loaded with firmware and calibrated...read oodles of money to replace
Repair is the only viable option for me. A classic case of buying the right tool for the job rather than struggling with basic tools and risking failure. $200 is reasonable and I will have future use of the LA I am sure. I also purchased the Hantek 1025G to act as a logic stimulator when required. Finaly I added the ultra cheap Hantek 6022BE 48MS/s DSO as a low freq USB scope to check power rails etc. Hantek has some issues with software quality but it will meet my humble needs and I now have a complete logic investigation kit running on my laptop when needed, and for not a lot of investment.