Hi all, I have here a 32 inch samsung tv which is showing no red standby led when power cord is connected, I tested the connector which supplies power to the main board and getting no voltage on any pin, both fuses on power board tested ok, i am geting 233.2 ACV at the first fuse and 130 ACV at the second fuse, I have tested all mosfets and diodes using atlas dca55, all caps on cold side of the board are also good. Only problem i can see is a small crack on the power board near one of the transformers but it does not pass through any traces, Not sure what else to test now.... Any help would be great. Thanks in advance.
Samsung LE32B530P7WXXU No Power
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Re: Samsung LE32B530P7WXXU No Power
are all the voltages on power supply correct?, caution HIGH VOLTAGE.Comment
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Re: Samsung LE32B530P7WXXU No Power
Do you get HIGH voltage DC on the BIG CAP and if not have you tested
the bridge rectifierPlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Samsung LE32B530P7WXXU No Power
Yes you could have a problem with the bridge rectifier you need to test at the main caps. if you have voltage is the main caps I would start checking the 5 volt standby supply railDid I leave the soldering iron on?Comment
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Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Samsung LE32B530P7WXXU No Power
Here is a schematic for that power supply!Attached FilesComment
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Re: Samsung LE32B530P7WXXU No Power
is there voltages marked on power supply at the connectors?, which are the cables going out from the power supply.Last edited by nomoresonys; 12-23-2014, 04:12 PM.Comment
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Re: Samsung LE32B530P7WXXU No Power
keep in mind only touch what your testing cuz of high voltage on primary side.Comment
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Re: Samsung LE32B530P7WXXU No Power
test both fuses again with the TV unplugged, DMM in the ohm scale. I just find it kind of fishy having 130V on that other fuse that feeds the PFC, but that depends on where the ground lead was. Check diodes and fets for shorts with DMM in diode mode.Comment
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Re: Samsung LE32B530P7WXXU No Power
Please provide good clear pictures of the whole bottom side of this power supply board.Last edited by budm; 12-23-2014, 07:57 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=24809Comment
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Re: Samsung LE32B530P7WXXU No Power
There is label for the connector on the bottom left of the board where he should list the Voltage readings of each pins for us to know what he is getting, the SCH also shows the pinouts.Last edited by budm; 12-23-2014, 08:03 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=24809Comment
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Re: Samsung LE32B530P7WXXU No Power
Its not really clear enough - can you retake it - get it near a window for more natural light
and no flash.(adjust the camera for low light?) If you cant do the full board better try for the top right across to where is says "COLD" that will give us the connector and the labelling.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Samsung LE32B530P7WXXU No Power
try unplugging the cable from the power supply to the main board, see if the backlights come on, not sure if you described weather they come on or not.Comment
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