Samsung HP-T4264 Clicking

[ntehicks]

I am looking at a 42" Plasma Samsung tv for a friend. when you plug the tv in all you hear is a solid click and then a fumble clicking noise. (several clicks that sound faint and fast together). and it does this over and over. I have tested the main fuse and the fuses on the right and left boards they tested good. but the fuse in the middle of the power supply I have circled in red is open. I wanted to know before I change the fuse what else I should test? thanks for all the help.

[Glitcher]

Re: Samsung HP-T4264 Clicking

Common problem with this model and psu. There are 4 FETs that need to be checked on the heatsink in the middle nearest the fuse. And there are some small smd resistors and diodes that also may have gone bad on the back side.

Here is the repair kit on ebay with all the parts:
http://www.ebay.com/itm/PSPF411701A-...item19d12194ec

Here's a thread of the problem and where the parts are located:
https://www.badcaps.net/forum/showth...light=hp-t4254

[ntehicks]

Re: Samsung HP-T4264 Clicking

so far I have tested the mosfets QS801 and QS802 test good. QX801 and QX802 test bad. I will test the smds and see what I find there.

[ntehicks]

Re: Samsung HP-T4264 Clicking

I might be alittle confused about the smd resitors. I was told they are either 20ohm or 10k ohm I have included a picture. I thought the 101 means 100 ohm and the 1002 is 20k ohm? and what is the best way to test these. do they have to be out of circuit or can you test them in.

I just fixed an HP-T4234 about 4 months ago. I believe the repair kit is the same for the HP-T4254:

RS862: 20 ohm
RS863: 10K ohm
RS867: 20 ohm
RS868: 10K ohm
RS879: 20 ohm
RS878: 20 ohm

RX802: 20 ohm
RX803: 20 ohm
RX804: 10K ohm
RX805: 10K ohm
RX832: 20 ohm
RX833: 20 ohm

[Glitcher]

Re: Samsung HP-T4264 Clicking

101 is 100 ohms and 1002 should be 10000 ohms. It's best to test them out of circuit, but if you can figure out if they are in series or parallel then you can probably get away testing them in circuit.

[ntehicks]

Re: Samsung HP-T4264 Clicking

so I purchased a kit that replaces both sets of transistors as well as 4 smd diodes and several smd resistors. now I don't even get a click. it is just dead.