Mulja tv repair portal

Equipment Repairs => PLASMA TV forum => Topic started by: t1412 on December 18, 2016,12:40:34

Title: ps50q97hd
Post by: t1412 on December 18, 2016,12:40:34

hi fella's having a nightmare with a samsung ps50q97hd, the clicking symptom, the psu is a bn44-00162a checked for dry joints, there was 3 bulged caps and a disc cap that had blown apart, any other part i should look or check for, thanks  for your time.


shaun 
       

Title: Re: ps50q97hd
Post by: downunder on December 18, 2016,22:27:09

Hi Shaun,
Q801/2 on the long central heatsink have very small solder pads and often develop dry joints. If so, scrape away some of the paint around the joints and resolder them, making sure they're not shorted first. Check smd components near these FETs, R802/3 and RX832/3 (all 20 ohm). R803 is across R832 = 10 ohm combined. Others to check are RX804 (10K) and DX803/4 (KDS184 or 1S184 or HSMS-2812)

Presume CX816/9 were among the bulged ones. If in doubt, the 2 larger FETs on the other end of the heatsink have an identical circuit to compare with. See how you go with that for starters.                 Bruce

Title: Re: ps50q97hd
Post by: t1412 on December 19, 2016,17:31:46

many thanks bruce

shaun :brinda:

Title: Re: ps50q97hd
Post by: t1412 on December 22, 2016,01:09:04

hi bruce done the qx801/802 but found dp810 uf4007 diode short,also rp855 resistor chuck of the body missing bottom, here is a  picture    thanks for your time

shaun

Title: Re: ps50q97hd
Post by: downunder on December 22, 2016,03:33:31

Hi Shaun,

I hope that fixes it for you. Thanks for the feedback.                  Bruce

Title: Re: ps50q97hd
Post by: t1412 on December 22, 2016,07:20:56

sorry bruse could you tell me what rp855 the value is please  the colours look like  gold gold blue yellow thanks

shaun

Title: Re: ps50q97hd
Post by: downunder on December 23, 2016,02:09:51

Hi Shaun,

As you've probably guessed, there are no schematics or parts list for the power supply. However, I do have this power supply at work, but for the 42 inch model. AFAIK they're virtually similar. I found R855 next to DP801 near a corner of transformer TP810. It is 4.7 ohms and sits in a line with 2 other 4.7 ohm resistors. So just verify location and go with that.                            Seasons greetings - Bruce

Title: Re: ps50q97hd
Post by: t1412 on December 23, 2016,03:06:06

many thanks bruce, merry xmas and a good 2017

shaun :brinda: