Re: Lg 50ps3000 with flashing standby light

Hi I have just been working on my 50ps3000.
(No picture but sound & flashing lamp).
Removing the ZSUS board made no difference.
however I tested board and found several Mosfets s/c including the ones available in a kit I have since seen advertised.
after repairing the ZSUS board I then looked at the 15vdd voltage and found this was missing. this turned out to be a faulty chopper Mosfet on the YSUS board, i replaced this and the set is back running again. I do however have issues with the temperature of Q13,14...

Re: 50ps3000 getting hot

Yes I have got a unit on order
Thanks again

Re: 50ps3000 getting hot

Thanks
Are they accurate enough? By the way good luck with the studies I am just finishing a masters in electronic product development currently working on the final thesis. I am doing mine distance learning so trying to fit that around a full time job it is hard work.
Cheers
peter

Re: 50ps3000 getting hot

Tom66
Thank you for the fast reply I have purchased two manuals for this set of the net but both do no contain any information of on the boards I want. I think they may be all the same and if so they are a very poor excuse of a manual. I don't understand why the manufacturer does not put all the circuit diagrams in the manual?
I understand what you are saying about the MOSFETS I don't have a way of measuring the heat but mine are so hot you can smell them cooking?
Regards
peter

I Have an LG 50PS3000 I have just rebuilt the ZSUS board replacing several MOSFETS and still no picture. I then found the switching MOSFET on the Ysus board short that produces the DD voltage stated on the board as 15v. I know have a good picture and all was looking good however after running for a few mins i found the MOSFETS Q13,14 and 15 on the Zsus board where getting very hot so I turned off the set and disconnected the Zsus board to prevent any further damage. I measured the 15vDD voltage and it is about 18v. I have also changed all the caps on the control board after reading some stuff...