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[pufferman]

All of my ORX rxs (which were all working perfectly for months or years) have just failed. There is only a momentary blink of the led then nothing.
What is going wrong?

[HMS Invisible]

...There is only a momentary blink of the led then nothing...

...is what I expect when you switch on power with the plug is inserted upside down.

[pufferman]

I thought of that and it might have happened sometimes but in one case the BEC plug had not been changed since it had last been used and that was with a new ESC that I had used in case the previous one had a fault although the voltage was correct as was polarity.

[unbuiltnautilus]

Is it more likely a Tx fault rather than all your Rxs?

[HMS Invisible]

Well, if you have a multimeter, continuity distinguishes the two supply rails from the row outputting the servo pulses.
With power connected correctly, I would expect the receiver to give visual indication by led and servos to adopt a bound failsafe position.
Without the Tx signal, I'd expect a servo to twitch on powering up the receiver.

[pufferman]

1) I have two Spektrum Txs . highly unlikely that both would be faulty together.
2)The power pins are all operational when powered up but the led only blinks once and does not enter bind mode.
a servo does not even twitch.
I think that I have to accept that I did a multiple cockup, and buy some replacements.
 
Sometimes I used a 2C lipo pack instead of the ESC. Would this higher voltage matter?

[HMS Invisible]

1) I have two Spektrum Txs . highly unlikely that both would be faulty together.

I missed that bit.

2)The power pins are all operational when powered up but the led only blinks once and does not enter bind mode.
a servo does not even twitch.

By continuity, I don't mean a test for damage.
Can you see the circuit board's continuous, copper track, -ve rail? - The brown/black wires, not orange/white wires, should all hook up to that row.
If you can't, is there an etched or moulded polarity symbol mark or Futaba style notches for orange/white wires.
So far, all photos of side entry Rxs show -ve is at the base of the Rx case.

I think that I have to accept that I did a multiple cockup, and buy some replacements.
 
Sometimes I used a 2C lipo pack instead of the ESC. Would this higher voltage matter?

There are quite a few ORX Spektrum compatible receivers to check. The first three so far all checked out as 2s Lipo compatible.
What have you got?
 
A normal check order:
A voltmeter isn't the first choice of test equipment but it would do.After ticking off correct plug polarity, I would check, on a breakout servo cable, for Rx power under a decent load current.
Next, I'd be looking for pulses on all or on any working channel pins.
With none, I'd inspect damage visually and meter for signs of semiconductor failure.

[pufferman]

Willing to have a go. What is a breakout cable?

[HMS Invisible]

Willing to have a go. What is a breakout cable?

An aid, here it would be a stripped servo cable, to take meter readings of the state on the pins.

First, what ORX receivers do you have? 

Second, how did you ensure  servo plugs were inserted correctly?
The two picture examples show:-

• a screen grab of an R920X where black/brown (-ve) wires would be adjacent to the table surface.
• The other Rx has a symbol (highlighted in yellow) to show -ve wires are uppermost.