Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

[Larry420r]

Make: Samsung
Model: PN51D550C1FXZA
Size: 51
Type: Plasma

Issue:

Plug in, Clicks.
LED Powerlight on front blinks.

After short time clicking stops.

Tv is apart. On table. I'm now lost in trying to diagnose this issue.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

if anyone knows how to diagnose how to fix the Xsus if that in fact is the culprit here are attached photos

I have tones of other parts I can take parts off of.

first photo there is some damage to back of board not sure if it will effect anything

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

1st picture looks as though it's just a poor solder joint that needs soldering.

You could use your meter set to ohms and check what resistance you have between the pins of the two white connectors to ground.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

1st picture looks as though it's just a poor solder joint that needs soldering.

You could use your meter set to ohms and check what resistance you have between the pins of the two white connectors to ground.

sorry I'm still extremely green to this, can you be more specific please

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

Do you have a soldering iron, also a multimeter and know how to use it?

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

Do you have a soldering iron, also a multimeter and know how to use it?

Yes I do have a soldiering iron, also yes I have a multi meter but not 100% familiar with it

I have attached a picture of the meter, if you are able to edit it and let me know what settings are what, we can move forward and I can try to assess this situation.

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

Best start with some basic checks.
With the board disconnected as shown in Picture 2 check the resistance between each pin in turn on the two white connectors.
Use red meter probe to test pins and connect black meter probe to a GND (Ground) connection.

I believe there are labels printed alongside the pins.
Example 5V, VA, VS, RL_ON , GND, etc

Select 200 ohms range and with the black lead on any of the pins marked GND use the red lead and check all each pin on each of the two white connectors and note the readings.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

readings:

1. vs - 3.5
2. vs - 3.5
3. ve_in - nothing
4. GND
5. GND ( which I'm using for ground)
6.ERC
7.Erc
8. erc
9. erc
10.erc
11. gnd
12. 15v - nothing
13. 5v - nothing

^-- top white connector

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

readings:

1. vs - 3.5
2. vs - 3.5
3. ve_in - nothing
4. GND
5. GND ( which I'm using for ground)
6.ERC
7.Erc
8. erc
9. erc
10.erc
11. gnd
12. 15v - nothing
13. 5v - nothing

^-- top white connector

bottom white connector only has 12. and no legend on what is what.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

Ps just tested the ERC pins and they read 190.4

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

So the VS pins are showing 3.5 ohms?

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

So the VS pins are showing 3.5 ohms?

this is correct

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

It looks as though you have a short circuit (near enough) on that line.

What voltage is VS when you read it off the label from the back of the plasma panel.
Can you post pictures of the front and back of the circuit board as attachments (so they are bigger) to view showing the devices mounted on the heatsinks. There's every possibility that one or more may be damaged.


You might find this helpful
https://www.youtube.com/watch?v=-7zWKY2Hwnc

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

uploaded

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

The pictures really don't open up to read anything on them.

If you set your meter to diode mode ---:>!-- check the devices that are mounted on the heatsinks and look for a short circuit (low reading) between any two pins of each device.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

The pictures really don't open up to read anything on them.

If you set your meter to diode mode ---:>!-- check the devices that are mounted on the heatsinks and look for a short circuit (low reading) between any two pins of each device.

alright will do now

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

heatsink - 002
(all points)

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

if you have skype or anything like that I can download it and install it to make communication easier

[dick_barton]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza

No, I don't sorry.

Unsolder the ones that read 002 and check again out of circuit. I suspect they are all short circuited.

What are the part numbers written on the devices fitted to the heatsink

When you are not familiar with the set, pictures are worth a thousand words.

Can you photograph the devices fixed to the heatsink.

[Larry420r]

Re: Here I Sit, Losing my mind. Haha. Samsung Pn51d550c1fxza