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Equipment Repairs => PLASMA TV forum => Topic started by: netdent on October 28, 2011,14:57:36

Title: Samsung PS50B430 Y-main Fault?
Post by: netdent on October 28, 2011,14:57:36

I have this samsung plasma, came to me with clicking syndrome! Narrowed it down to the y main board, on closer inspection on the y board small 1 amp fuse open, never had solder in fuse to hand so soldered 2 wires and crock clipped 1amp fuse inline, powered on no clicking but an smd resistor smoked slightly followed by clicking psu again, fuse remained intact! the voltage across the fuse is 15 volts.

I removed the y board and found a shorted fet circled red in picture IRFP4332 there are 2 of these the other read ok, I replaced the shorted fet and fitted back in, the set powers on and makes the right noises but screen is blank. I'm thinking still a problem on this board? all psu voltages read correct

The previous owner changed the LDVS board, and also tried to fit an incorrect y board? but think there was no damaged caused by this.

I removed the SMD transistor to test and try and see its value, when I put my probes across it pinged away :33: now its well and truly lost :oops:

thanks Ronnie

Title: Re: Samsung PS50B430 Y-main Fault?
Post by: fix2003 on October 29, 2011,02:56:09

only had trouble with CM409 1000uf on psu o/c
it looked fine fine but read open circuit

Title: Re: Samsung PS50B430 Y-main Fault?
Post by: netdent on October 30, 2011,11:26:08

Quote from: FIXITNOW on October 29, 2011,02:56:09

only had trouble with CM409 1000uf on psu o/c
it looked fine fine but read open circuit

Not much response, guess I will need to source a replacement board but there are none to be found