I have a Megmeet MLT198L P/S with no output. Am down to IC2 with the # 62639 on top. No output with 12v Vcc. Have isolated output line so it is not being pulled down. Anyone know what type part IC2 is, possibly PWM, and does anyone know where I might procure a good part? I have the schematic, but IC2 is not labeled at all on it. Thanks for any help here....
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Re: ILO LCT42HA36 w/ Megmeet P/S MLT198L
No standby output either?
Pictures of the whole board both sides please.
Also post the sch.Last edited by budm; 10-03-2014, 09:05 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: ILO LCT42HA36 w/ Megmeet P/S MLT198L
Thanks for your quick response. There are no outputs at all, including sb5v. IC2 is responsible for ALL outputs as it produces VCC. See attachment MLT198L-IC2. Thanks also for your additional suggestions. Will get pcb photos ASAP. Thanks again for your response.
Attached FilesLast edited by Rrabbitt; 10-04-2014, 01:13 AM.Comment
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Re: ILO LCT42HA36 w/ Megmeet P/S MLT198L
OK, so we need to get the STBY power supply section working first.
There should be more than just '62639 ' printing on top of the IC, it is SMPS IC.
The diagram is not from the manufacturer so I am not sure if it is 100% correct or not.
You can try checking the resistance between the Ground pin and the VCC pin, you can also try replacing the start cap that is connected to the VCC pin.Last edited by budm; 10-04-2014, 10:13 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: ILO LCT42HA36 w/ Megmeet P/S MLT198L
Thanks for your suggestions, that number, 62639, is all there is - I've used a microscope to check. I've found a pwm IC with the same pin out and have ordered it, but in the mean time i'll try replacing the timing/startup cap and see what that brings. So far the schematic matches the circuit.
Regards,Last edited by Rrabbitt; 10-04-2014, 11:13 PM.Comment
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Good morning everyone,
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