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Check out the SFE “Uber board” schematic, that has a JTAG connector on it.
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Does the oscillator start ?
Also try to slow down the JTAG or use 10K resistors, may be the 100k resistors are too high for the speed you are using.
Giovanni
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You could check the oscillator with a logic probe or RF probe, it’s quite easy to make one. Or, listen for the signal on a SW radio.
Leon
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Yes, running the bootloader. This would give you evidence of correct startup and stable operations.
Giovanni
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Yes, you just need to add a level translator.
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You need to hold P0.14 low while Reset is low to enable the boot loader.
To enable JTAG you need a weak pull-down resistor on P1.26.
This stuff is in the data sheet and the user manual.
Leon
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Have you checked that they are actually connected to the LPC2148 pins and are working properly?
Leon