Hello guys,
I'm learning to repair monitors. I don't have much experience, but I managed to repair a few monitors by changing bad caps.
However, I'd like to learn how the PSU is working since, most of the time, there is a fault on PSU board.
Attached, there leis a picture of board PSU (Samsung SyncMaster), There is no problem on the board. I'd like to learn what some components is doing.
First of all, there is a AC power input (230 VAC), and after input EMI filter, there is a bridge rectifier (1) and a big cap (2). On this cap (2), there is DC voltage about 300 V. Ehat is the purpose of MOSFET (3) and transformer (4). I know that from this rectified input voltage, lower part of the board with its components produce 5V and 12 V (this can be 14 or even 16V).
I also know there is a high voltage transformer needed to supply backlight
Ca you please tell me, what is the purpose of transformer (4) and element (5).
I guess diodes (6) are used to rectify output from transformer (4) which is AC to DC voltage 12 V?
What caps (7) are doing? DO they filter this rectified voltage?
Thank you for your time.
I'm looking forward to your explanations.
I'm learning to repair monitors. I don't have much experience, but I managed to repair a few monitors by changing bad caps.
However, I'd like to learn how the PSU is working since, most of the time, there is a fault on PSU board.
Attached, there leis a picture of board PSU (Samsung SyncMaster), There is no problem on the board. I'd like to learn what some components is doing.
First of all, there is a AC power input (230 VAC), and after input EMI filter, there is a bridge rectifier (1) and a big cap (2). On this cap (2), there is DC voltage about 300 V. Ehat is the purpose of MOSFET (3) and transformer (4). I know that from this rectified input voltage, lower part of the board with its components produce 5V and 12 V (this can be 14 or even 16V).
I also know there is a high voltage transformer needed to supply backlight
Ca you please tell me, what is the purpose of transformer (4) and element (5).
I guess diodes (6) are used to rectify output from transformer (4) which is AC to DC voltage 12 V?
What caps (7) are doing? DO they filter this rectified voltage?
Thank you for your time.
I'm looking forward to your explanations.
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