Hi all ,
A friend sent me this old Samsung Syncmaster 153V LCD monitor to repair. The problem is no power,completely dead no light whatsoever. He had sent to a shop for repair before and the monitor came back to life for a short while, later he kept it aside as spare unit but later found out the unit is non working.
I had some basic skills in repairing dead monitor with a soldering iron,solder pump,a digital multimeter (DMM), and a digital capacitor meter. After opening up the plastic case, I see no bulging caps or burnt marks and try search online for a service manual/schematic but none found.
Testing at component level on the power supply board at position D660=Schottky Diode STPR10 is open, failed diode test.
Also at position D440=LT 350 SBL1040CT Schottky Rectifier Diode is open and failed diode test. (refer image 1450) The new parts will arrived in about 2-3 weeks from now. I have the following questions:
1) What are other components that are likely failed and needs checking?
2) How do I removed the two faulty diodes(refer image 1450) which are placed in a tight spot, my philips screwdriver can 't reach the screw as they are blocked by the yellow square transformer.
3) How do I use light bulb series to limit the current going to the power board
after putting in new parts?
Attached image 1411 as board top picture,image 1440 as power &VGA board
and image 1456 as VGA board.
Appreciate for any help or suggestions.Thanking in advance.
A friend sent me this old Samsung Syncmaster 153V LCD monitor to repair. The problem is no power,completely dead no light whatsoever. He had sent to a shop for repair before and the monitor came back to life for a short while, later he kept it aside as spare unit but later found out the unit is non working.
I had some basic skills in repairing dead monitor with a soldering iron,solder pump,a digital multimeter (DMM), and a digital capacitor meter. After opening up the plastic case, I see no bulging caps or burnt marks and try search online for a service manual/schematic but none found.
Testing at component level on the power supply board at position D660=Schottky Diode STPR10 is open, failed diode test.
Also at position D440=LT 350 SBL1040CT Schottky Rectifier Diode is open and failed diode test. (refer image 1450) The new parts will arrived in about 2-3 weeks from now. I have the following questions:
1) What are other components that are likely failed and needs checking?
2) How do I removed the two faulty diodes(refer image 1450) which are placed in a tight spot, my philips screwdriver can 't reach the screw as they are blocked by the yellow square transformer.
3) How do I use light bulb series to limit the current going to the power board
after putting in new parts?
Attached image 1411 as board top picture,image 1440 as power &VGA board
and image 1456 as VGA board.
Appreciate for any help or suggestions.Thanking in advance.
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