Hello forum members,
I'm from Germany and got a Medion MD3021PH 19' LCD Flatscreen. It has been working for many years without any problem, but since yesterday the screen remains black...
If you push the power button there is no response, the power on led stays dark. So I decided to disassemble the display and take a look for the power supply. Here is a picture of the front and the back of the board:
A schematic PDF is available here
In my opinion, the electrolytic condensators look fine. I tried to repeat the steps that PlainBill described in thecicero lcd inverter IC replacment needed thread.
The voltage on the big one, the C001 is around 320V so the fuses and AC/DC components should be still OK. Unfortunately you can't measure any voltage on CN1, neither on +5V and GND nor +12V and GND. When I do a shortcircuit with 10Ohms and +5V and GND also nothing happens...
On the picture of the front I just wonder about the dark spot where the white arrow points to. On the back there is the IC U101 named 4606 BE5B32. Optically I see no damage caused by heat. But is it probably the reason for the blackscreen? I could order some 4606 power mosfet and replace them...
What other things should I try next or what components I should replace?
I'm not really used to electrical complex circuit staff so I would appreciate your help!
I'm from Germany and got a Medion MD3021PH 19' LCD Flatscreen. It has been working for many years without any problem, but since yesterday the screen remains black...
If you push the power button there is no response, the power on led stays dark. So I decided to disassemble the display and take a look for the power supply. Here is a picture of the front and the back of the board:
A schematic PDF is available here
In my opinion, the electrolytic condensators look fine. I tried to repeat the steps that PlainBill described in thecicero lcd inverter IC replacment needed thread.
The voltage on the big one, the C001 is around 320V so the fuses and AC/DC components should be still OK. Unfortunately you can't measure any voltage on CN1, neither on +5V and GND nor +12V and GND. When I do a shortcircuit with 10Ohms and +5V and GND also nothing happens...
On the picture of the front I just wonder about the dark spot where the white arrow points to. On the back there is the IC U101 named 4606 BE5B32. Optically I see no damage caused by heat. But is it probably the reason for the blackscreen? I could order some 4606 power mosfet and replace them...
What other things should I try next or what components I should replace?
I'm not really used to electrical complex circuit staff so I would appreciate your help!
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