Troubleshoot SMPS board with laboratory power supply

budm

Badcaps Legend

Join Date: Feb 2010

Posts: 40746

Country: USA
#21

10-01-2014, 11:20 AM

Re: Troubleshoot SMPS board with laboratory power supply

"because the guy said the main power supply is +/- 25v" Your power amplifier section used in you model does not use BI-POLAR (+/-) power supply like the one you have in the link. You can see that it only has one large filter cap in the secondary side. Your power supply has four set of rectifiers circuits. The Opamp sections needs BI-POLAR power supply and that is why it has +/- Voltage regulators.
Again, I do not who 'THE GUY' is, he needs to look at the board and see how you board is setup.

Last edited by budm; 10-01-2014, 12:04 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
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Troubleshoot SMPS board with laboratory power supply

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