I just read the part number on mosfet and it's 4502C AA5NP if my eyes caught it right. My main AC is 240V that means bridge rectifier is ok same voltage is across big Capacitors around 328V. NOW I'll be checking mosfet
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mawais15
New Member
Last Activity: 08-10-2014, 12:05 AM
Joined: 08-08-2014
Location: Wah cantt, Punjab
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Re: Problems with Samsung 740N monitors
I just read the part number on mosfet and it's 4502C AA5NP if my eyes caught it right. My main AC is 240V that means bridge rectifier is ok same voltage is across big Capacitors around 328V. NOW I'll be checking mosfet.
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Re: Problems with Samsung 740N monitors
Thanks for your help :-) . I will check the mosfets once I find the datasheet.
One more thing I've noticed is the voltage across the DC pins of bridge rectifier is above 300V. Is this OK?...Leave a comment:
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Re: Problems with Samsung 740N monitors
Sorry I should have measured resistance across secondary windings, the values are 1335 and 1360 ohms across secondary windingsLeave a comment:
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Re: Problems with Samsung 740N monitors
The voltages between s1 and s2 as well s3 and s4 are zero when testes the board alone. The pink 8 pin component is 4502C and it looks in bad condition, I'm not sure if it's fine ( how do I check it). Those capacitors in yellows squares are soldered. In one of the red square that seems bridged is the fuse. And the 2nd red square is not bridge....Leave a comment:
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Re: Problems with Samsung 740N monitors
Yes I have checked the fuses, both near the heats ink and near the power plug (cylindrical one) both are short. I could not understand where to measure the voltage on board. Cantilever please highlight it...Leave a comment:
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Re: Problems with Samsung 740N monitors
I don't see anything on the screen when I switch on the power. It stays black with power led continously working. I'm attaching the picture. Thanks :-)...Leave a comment:
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Re: Problems with Samsung 740N monitors
Hello friends, I joined this forum after my syncmaster 940n stopped working the other day, dark screen with no display and no flashing led. Led continuously working without flashes.
I've check the fuses, they're Ok, I've replaced the capacitors as well 1000uf 25V. Any idea of pleaseLeave a comment:
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