I have a Turbo Air TGF-49F freezer and it is not cooling. The compressor unit seems to work but when I turn the unit on all I hear is the compressor running continuously but nothing gets cold.

Question edited for greater clarity.
Question moved from 'Power Computers' to Freezers.

Disconnect the mains power for 5 minutes to reset the control board. If that doesn't fix it, call for service.

You need a new regulator. get the manufacturer and make and numumbers and look it up and save hundreds putting it in yourself.

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Did they test the thermostat? I would think that the compressor would kick on before you got that much of a fluctuation, unless the thermostat is not sensing the change fast enough.

The run and start capactiors and relay, did they give you a reason for that? When the compressor kicks on does it surge the power? Light dim or something? It is hard to guess without being able to put an o'scope on your machine to be able to see what it is doing, but just based on what your write-up was, I can't see the parts you said they want to replace will fix the problem.

Okay first True uses capillary tube not an expansion valve.
You say the compressor vibrates not cooling ?
If the valves of the compressor are bad, he may mean
internal valves but usually pressures would not be good.
Give a little more detail please.

in many cases, these units have relays or contactors where the contact points actually weld together. this causes the unit to stay running even though power to the coil has been stopped. I'd start looking there first. don't over look the possibility that someone could have mistakenly miswired the unit.

Probably the compressor has shorted.
99.999% of the time this is the main culprit.
Otherwise wiring short.

cap tube/ has unit been serviced before/ if you know it has correct charge compressor may have failed easy fix. expansion valve or cap tube maybe another thing to check i always remove entire charge get a good micron reading put exact charge back in if wont pull down comp. likelly

If it's frosted up, it's best to defrost manually with heat gun. Find the timer and advance until it goes back into defrost. The timer looks like a residential fridge. It cut the compressor off and the heaters on.
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we specialize in true freezer repair in illinois. Is compressor running or fan under unit? if not the thermostat may be bad.

Your unit should have a defrost timer.The timer may be stuck in a defrost.It should be located at the bottom of the unit next to the compressor.Open the door to the timer and observe the position of the timer.If you turn the knob and the unit starts up,it's the timer. If this is the case, you can purchase a new one at any local a/c supply.Let me know,Mike