Samsung Ps-42c96hd Capacitor replacement

[garrymc123]

Hi Guys got this plasma in for repair customer said it took longer everyday to turn on so upon inspection there was 4 capacitors needing replaced but after replacing them all i get is the board turning on then straight back off its like click on then click back off.. Any advice on this one please guys ..Thanks

[akis24]

Re: Samsung Ps-42c96hd Capacitor replacement

Hi check the 5 volt stand-by line and replace any filter capacitor even if it does not appear swollen ... and check if all the expected voltages are present at the output sorry for my bad english .

[R_J]

Re: Samsung Ps-42c96hd Capacitor replacement

Disconnect the plugs going to the y-sus and X-sus boards and see if the clicking stops, If it does check for a short on one of the boards
Because of the bad caps and constant restarting, there may be other damage
Also check NT801s thermistor and relay connections, If NT801s is burnt/open also replace relay RL801s

[garrymc123]

Re: Samsung Ps-42c96hd Capacitor replacement

Hi Guys thanks for the information.. on voltage test points with board on the bench plugged into mains only and also no clicking from relays has anyone a schematic for this board and i will check parts ..Thanks

stb_5v = 5.109v
18v_amp = 0.038v
12v = 0.514v
D5.3 = 0.493

[R_J]

Re: Samsung Ps-42c96hd Capacitor replacement

Whats the board number? it can be something like BN44-00xxxx, I think its a BN44-00159a?
Try the board without the main connected, many samsung boards use a pull up resistor on the ps_on line
That will turn on all but the Vs line which requires a 1k resistor from Vs on to standby 5

[garrymc123]

Re: Samsung Ps-42c96hd Capacitor replacement

its BN44-00159A yeah you are correct R_J

[R_J]

Re: Samsung Ps-42c96hd Capacitor replacement

Then it should turn on without the main connected. PS_ON will be high (5 volts)

[garrymc123]

Re: Samsung Ps-42c96hd Capacitor replacement

ok so if i join them with a resistor all the voltages should turn on ie 12v 18v D5.3v with it plugged into the wall only .Thanks

[R_J]

Re: Samsung Ps-42c96hd Capacitor replacement

You dont need to join anything with a resistor to get the main voltages (12v,18,etc) to come on. Just unplug the main board and plug in the a/c
There is only ONE voltage (the VS) that requires placing a resistor from standby 5 to Vs_on to turn it on