Those two pins of the bridge rectifier will show as shorted circuit because they are connected to the winding of the transformer which has very low DC resistance.
You need to remove the bridge rectifier to be able to test it properly.
GUYS GUYS GUYS !
I just put this stupid thing on power.. the bridge retifier where the burnt area was, lighned up and burnt the whole area again.. the fuse is still good... when i put power in again nothing hapend... so i am 100% sure the thing is broken.
ANY idea what i need to buy.. ?
the numbers are total useless
GUYS GUYS GUYS !
I just put this stupid thing on power.. the bridge retifier where the burnt area was, lighned up and burnt the whole area again.. the fuse is still good... when i put power in again nothing hapend... so i am 100% sure the thing is broken.
ANY idea what i need to buy.. ?
the numbers are total useless
The BD1 bridge rectifier with the burnt pins are in the cold side of the circuit, that yellow PFC inductor is in the PFC circuit which is in the hot side of the circuit.
BTW, did it burn up the minute you plug the AC plug into the wall outlet or after you hit the power switch?
the yellow PFC inductor just burnt out when i plugged the power in...
didnt press anything... fuse is fine...
guess there is no chance to buy another yellow PFC inductor ?
Can I see the bottom side of the board where the PFC inductor is?
That PFC section is not activated until the power switch is turned on and PS-ON is sent from the main board..
hmm.. this tv has a seperate power switch on bottom on the back...
i only plugged in two things.. the 230V power cord and the TV power switch... the plugged in and the yellow pfc burnt out...
damn i read the only thing to do is to build your own coil (
That is the same OLD picture from before and I do not see burnt section around that PFC inductor.
How about new closed up pictures of the PFC inductor legs that are soldered to the board?
Also pictures of the re-soldered of the BD1legs.
Show us NEW pictures!
At this point we are hoping it is bad snubber cap failure only.
You need to verify that R613 is still OK, same for the PFC MOSFET.
The new cap should be rated at lest 2KV, it is commonly failed cap in other power supplies as well.
Ceramic cap failure mode is leaky or short circuit.
R613 is still very very low.. 0,3 Ohm.. like before... i think i cant measure the mosfet in circuit... only leg 1 to 3 i got stable measures... 1-2 and 2-3 is alway changing when measuring-
R613 is fine, it is not damaged when the cap shorted out, it is the current sensing resistor connected to the Source pin of the PFC MOSFET so more likely it the MOSFET is OK too.
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