I've got the older Hanns g 28 monitor with power supply Phihong psm217-h-r. My power supply quit. I've troubleshot it down to the 12V & 24V transformer failing (i.e. Phihong 26002170001). These boards and the transformer are nowhere to be found.
I've got a couple of questions for those who might know the answer. I don't have 5V or 12V at CN1. I don't have 24V at CN3. I have 5VSB (I've already swapped out the dried out capacitors). Additionally, the PSON functions properly.
(1) Does the 5V derive from either the 12V or 24V transformer? The PWA states that it supplies 7A.
(2) Since these boards are difficult to procure, is it possible to solder a couple of wires from the transformer pinouts which connect the 12V and 24V duo diodes and supply the DC voltage externally from regulated switching power supplies? I'd leave the transformer out and solder 2 wires for the 12V and 24V supplies and 1 wire for the returns respectively. This would cover 12V and 24V DC the transformer is supplying. My assumption is that the transformer output at the duo diodes is DC.
(3) There is a center wire leading from the transformer of which I am uncertain what it is to supply/what it's function is. It is connected to a diode on the PWA.
(4) If the 5V isn't derived from this transformer, where is it supplied from? Perhaps I have an additional problem on the board.
Any help would be appreciated. Thanks much.
I've got a couple of questions for those who might know the answer. I don't have 5V or 12V at CN1. I don't have 24V at CN3. I have 5VSB (I've already swapped out the dried out capacitors). Additionally, the PSON functions properly.
(1) Does the 5V derive from either the 12V or 24V transformer? The PWA states that it supplies 7A.
(2) Since these boards are difficult to procure, is it possible to solder a couple of wires from the transformer pinouts which connect the 12V and 24V duo diodes and supply the DC voltage externally from regulated switching power supplies? I'd leave the transformer out and solder 2 wires for the 12V and 24V supplies and 1 wire for the returns respectively. This would cover 12V and 24V DC the transformer is supplying. My assumption is that the transformer output at the duo diodes is DC.
(3) There is a center wire leading from the transformer of which I am uncertain what it is to supply/what it's function is. It is connected to a diode on the PWA.
(4) If the 5V isn't derived from this transformer, where is it supplied from? Perhaps I have an additional problem on the board.
Any help would be appreciated. Thanks much.
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