samsung UN22D5010 no power

[capkid]

Re: samsung UN22D5010 no power

I'm no expert when it comes to PSUs, and I would defer to Bud. In general, you should test the components yourself to confirm whether they're functioning correctly.

[jose6326]

Re: samsung UN22D5010 no power

You are right Capkid I should have asked you how to test it.
I am no where near you guys level in electronics

So how do you test it?

[capkid]

Re: samsung UN22D5010 no power

I learned quite a bit about fixing TVs and testing components from John Preher - still learning:

http://preher-tech.com/documents/optoisolators

Someone may have an alternate method for testing these. For most components, you can do a search online to pull up info on how to test. If you're unsure about the component's type, just pull up a data sheet.

[jose6326]

Re: samsung UN22D5010 no power

Thanks for the info
Only problem is that I dont have an analog meter

In method 2 it instructs you to use both dmm and anolog meter to test

I will test it at work

[jose6326]

Re: samsung UN22D5010 no power

i did a search on PC801S and i just kept getting data sheets that led me to other electronic components i dont need

i went on digikey to see if i can find it
there are numbers on the opto but i dont know which one is the part number
here is what it looks like

1104
817B
X

there is what looks like the letter L before the numbers 1104 but i think it is the logo of the manufacturer

i typed in the numbers in different ways and the closest i found was this on digikey

http://www.digikey.com/product-searc...rt=LTV-817B-ND


there is no pdf on the lite-on opto only for the fairchild one

the difference between the two is the fairchild opto has a 70V output compared to the 35V output on the lite-on opto

i think the lite-on opto is the original one i need since it is out of stock and everything i have been needed has been out of stock

i attached the pdf of the fairchild opto

budm please let me know if this is an equivalent replacement


thanks

[tom66]

Re: samsung UN22D5010 no power

It is a PC817.
http://www.digikey.com/product-searc...=0&pageSize=25

[jose6326]

Re: samsung UN22D5010 no power

im guessing any of the first 4 will do?

thanks tom

[jose6326]

Re: samsung UN22D5010 no power

are these optoisolators common on most different brand of tv's?

i seen this opto on the polaroid psu and the samsung psu

i was thinking of ordering extras thats why i ask

[tom66]

Re: samsung UN22D5010 no power

They're reasonably common industry standard devices.

[jose6326]

Re: samsung UN22D5010 no power

Ok I replaced the opto, all the caps and the really small chip on the back side and still nothing

I am getting the 120 line voltage

I checked voltage at the large cap 171.1v
and medium cap .595
I also checked voltages at both connectors

White connector is 0.000 at every pin
Black connector is .6 at every pin

So im guessing there is something else that is defective and not letting the power come thru

What else should I test?
Not sure how to test rectifier

[capkid]

Re: samsung UN22D5010 no power

Testing bridge rectifier: http://www.youtube.com/watch?v=dqkT6hF0O3E

FYI: You can Google most components to find tests for them.

I'd cut bait on this TV. IMHO, it's just not worth the time.

[jose6326]

Re: samsung UN22D5010 no power

Thanks capkid
I tested rectifier and it is good

[jose6326]

Re: samsung UN22D5010 no power

Testing bridge rectifier: http://www.youtube.com/watch?v=dqkT6hF0O3E

FYI: You can Google most components to find tests for them.

I'd cut bait on this TV. IMHO, it's just not worth the time.

I would toss this tv but its a good way to learn
I wanted it to connect my phone to it and use it as a monitor

[jose6326]

Re: samsung UN22D5010 no power

i forgot to ask
when i installed the opto does it matter the postion i install it?

i figured i would install it the way the original was installed but it may be pinned differently


also i tested the diodes on the board and the ones in green tested good
i got readings one way and not the other


but im not sure about the components in the red boxes
are these diodes?
i tested all of these and i was getting readings both ways

i will retest again

[budm]

Re: samsung UN22D5010 no power

Yes, the Opto has the LED emitting side and the Photo transistor side.
Those are Diodes.

[jose6326]

Re: samsung UN22D5010 no power

ok i will remove the opto and switch it around
hopefully that is why it did not power on

i will retest diodes again


thanks

[jose6326]

Re: samsung UN22D5010 no power

retested the diodes according to the youtube video

http://www.youtube.com/watch?v=_3G8t-cV1d8

All 3 diodes in the red box read 0.000 whether i change the leads positive to negative or vice versa

The other 4 diodes in the red box I get 2 readings
If I put the negative probe on the leg of the diode with the silver line I get 0.132
And thats for all 4 diodes

When I put the positive probe on the leg of the diode with silver line I get 1.435 and it continues to go up to 1.644 and slows down but still continues to go up

This is for all 4 diodes

Are all of these diodes defective?


https://www.badcaps.net/forum/attach...&d=1377709100I

[jose6326]

Re: samsung UN22D5010 no power

I also tested the mosfet off the board

Here are the readings

Starting with positive probe
1-2: OFL (open)
2-3: 0.000
1-3: OFL (open)

Starting with negative probe
1-2: OFL
2-3: 0.486
1-3: OFL

Not sure if defective or not

[capkid]

Re: samsung UN22D5010 no power

I retested the diodes according to the youtube video

http://www.youtube.com/watch?v=_3G8t-cV1d8

All 3 diodes in the red box read 0.000 whether i change the leads positive to negative or vice versa

The other 4 diodes in the red box I get 2 readings
If I put the negative probe on the leg of the diode with the silver line I get 0.132
And thats for all 4 diodes

When I put the positive probe on the leg of the diode with silver line I get 1.435 and it continues to go up to 1.644 and slows down but still continues to go up

This is for all 4 diodes

Are all of these diodes defective?

You might have to remove them from the board to get accurate readings.

[jose6326]

Re: samsung UN22D5010 no power

I was planning on doing that
I will post udated readings tonight