Trying to find correct input/output voltages for an inverter transformer.

[james28909]

Part number is 80gl26t-17-dn. I found a schematic but I am uncertain of the correct values. Any help would be appreciated. Transformer is on a power supply and it drives the backlights of a hanns g monitor. Thanks for reading.

[james28909]

Re: Trying to find correct input/output voltages for an inverter transformer.

Also would like to say before anyone questions... There was a buldging cap which I replaced with same value cap and a rectifying diode fmx12s that I replaced with a fmx22s (read online and seemed it was ok to do). The transformer area looks very overheated and I am sure it needs replaced. Would just like to verify voltages of inverter transformer part number 80gl26t-17-dn. Thanks

[budm]

Re: Trying to find correct input/output voltages for an inverter transformer.

We need to see the pictures of the board so we can see what we are dealing with first.

[james28909]

Re: Trying to find correct input/output voltages for an inverter transformer.



It's the transformer on the right.

[james28909]

Re: Trying to find correct input/output voltages for an inverter transformer.



It's the transformer on the right. The cap right below it is the one I changed and the diode on the heatsink as well. Diode was originally an fmx12s and was replaced with a fmx22s

[budm]

Re: Trying to find correct input/output voltages for an inverter transformer.

Pictures of the bottom side of board?
Those heated areas of the board are probably due to the SMD power MOSFET's that drive the inverter transformer run hot when the filter caps are bad.

[james28909]

Re: Trying to find correct input/output voltages for an inverter transformer.


Right where the sticker is... Is where the inverter/transformer is.

Also which are the filter caps? I've replaced the one that looked bad the was right next to the transformer but it made no difference. The filter cap is the big one on the hot side? Thanks for your patience.

[budm]

Re: Trying to find correct input/output voltages for an inverter transformer.

As is right now we do not know what the symptom is: no power at all? Has power and the LED indicator is on but no backlights?
Picture of the bottom side of the board is way out of focus to be able to trace out anything.

[james28909]

Re: Trying to find correct input/output voltages for an inverter transformer.

The problem originally was no backlights. Everything else worked as intended. Power on and off and would come out of standby when a monitor was hooked up. Just no backlights.

I then took it apart and immediately seen the transformer seemed to have overheated and seen the cap right beside it was bad, confirmed it was bad with multimeter. Upon putting in a new cap the monitor would turn itself on and off even with power button board connected to main board. Everytime it would cut off I would hear a little short high pitched whine. So I replaced the diode. Then that let me control powering it on and off with the power button but it still power cycles after it's turned on... And on top of that still no backlights at all.

I'll post better pics in just a little while.

[budm]

Re: Trying to find correct input/output voltages for an inverter transformer.

The MOSFET's (8-pin SMD) that drive the primary winding of the transformer may be bad, you need to get the P/N and then check the resistance between S and D pin.