universal tdk inverter.what is the little white thing ?

[petehall347]

its a universal tdk inverter thats refusing to send the turn on external mosfet on .

[stj]

Re: what is the little white thing ?

5-1?? must be a diode

[petehall347]

Re: what is the little white thing ?

ok will diode test it . its not shorted i checked that already

[petehall347]

Re: what is the little white thing ?

tests as a diode .mystery solved .. now need to see why its not turning on .

[CapLeaker]

Re: universal tdk inverter.what is the little white thing ?

5.1V zener diode? Maybe it isn’t zenering correctly?

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

its not doing anything as no power is getting to the inverter .
i am struggling to see how it is supposed to switch on .
this is it ..
CXA-P1212B-WJL-1
i cant see how the main board can supply anything but 12v .

[CapLeaker]

Re: universal tdk inverter.what is the little white thing ?

maybe post some pics of the whole thing?

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

will post pic of the mainboard where the inverter plugs in and the inverter but plenty of pics and data sheet online for inverter . i can switch on the 12v by switching the fet on the mainboard on by making the gate low but inverter still not on . well no lights are coming on .i dont have x100 leads for my meter .

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

pics .

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

i can see q1 should be turning on to send u28 low and turning u28 on to supply the 12v but cant see any connections on the mainboard for anything else but 12v .

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

inverter pdf .
https://www.alldatasheet.com/datashe...1212B-WJL.html

[R_J]

Re: universal tdk inverter.what is the little white thing ?

Is the fuse good on the inverter? Do you have about 2v on pin 5 of the inverter to turn it on?
Check which pin Q1 base (R63) connects to on the inverter, If it connects to pin6, that is the protect line.

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

what fuse ?
i cant see where 2v is supposed to come from .. should it come from the mainboard ?

[R_J]

Re: universal tdk inverter.what is the little white thing ?

That looks like a fuse on the inverter marked 20 (2Amp), it should be connected to pin 1, The 2.5 volts needs to be on pin5, this is what turns on the inverter look at the datasheet, Pin5 Vmt 0~.4v=off, 2.5v~vin = on
The on/off signal should come from the main board.

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

fuse is fine .
will check all pins voltages again shortly .

[R_J]

Re: universal tdk inverter.what is the little white thing ?

You should be able to test it with a 12v bench supply (or even a 9v battery) then use a 1k resistor between pin5 and pin1 to turn it on.

What is that mess around C337 on the main board? does that line connect to pin 5 on the inverter?

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

pin 5 goes to q1 base via r63 ..looks to me this should switch on u28 to provide 12v which is on q1 emitter or collector one of those goes to ground .

[R_J]

Re: universal tdk inverter.what is the little white thing ?

I count 7 pins on the inverter and 5 pins on the main board. which pins on the inverter connect to which pins on the main board?

I doubt pin 5 of the inverter connects to R63, are you sure its not pin 6 on the inverter board?

[petehall347]

Re: universal tdk inverter.what is the little white thing ?

pin 5 inverter goes to centre pin main board . which goes to r63

[R_J]

Re: universal tdk inverter.what is the little white thing ?

pin 5 inverter goes to centre pin main board . which goes to r63

That will not work. Pin 5 of the inverter is the ON OFF pin, you can't control this from the base of a transistor.
It makes more sense that pin 6 on the inverter connects to R63 and then the base of Q1, If the inverter has a problem, it will output 5v on pin6 turning on Q1 which will turn off the 12v to the inverter