Samsung crt tv will not turn on.


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Samsung crt tv will not turn on.

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SykoMiko
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Jun 4, 2012, 12:54 AM

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Samsung crt tv will not turn on.	Can't Post

Hello everyone. I've a samsung TX-S3082WH. It won't turn on, the led light isn't on either. I can hear a ticking sound coming from the board. I read this ticking is the board going into protection mode, and that I might have a bad IC. I have a DMM I could use to test components, but am not sure where to begin. I would be eternally greatful for anyone who could help me

SykoMiko
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Jun 4, 2012, 7:24 AM

Post #2 of 49 (11240 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

Oops, I mean a bad horizontal output transistor, not IC. I also checked the board for bulging capacitors, and found none. Can anyone help me with this?

mel
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Jun 4, 2012, 10:36 PM

Post #3 of 49 (11228 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

Check the resistance of collector to emitter and emitter to collector of the horizontal output transistor and post readings.

SykoMiko
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Jun 5, 2012, 1:36 AM

Post #4 of 49 (11225 views)
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Re: [mel] Samsung crt tv will not turn on. [In reply to]	Can't Post

There's two transistors on a heat sink located near the flyback. I checked the resistance for both of these.

It's 0 ohms across the board. Does this mean they are shorted out?

jts1957
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Jun 5, 2012, 3:15 AM

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Re: Samsung crt tv will not turn on. [In reply to]	Can't Post

Either one of you happen to have the chassis number?

Mel:
"What we've got here is (a) failure to communicate"

-------------------------
Location: Far, Far Away

SykoMiko
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Jun 5, 2012, 3:35 AM

Post #6 of 49 (11216 views)
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Re: [jts1957] Samsung crt tv will not turn on. [In reply to]	Can't Post

Yes the chassis number is K63A

Model code: TXS3082WHX/XAA
Type No: NT32Z40 AC110-120V 60Hz 180 watt

SykoMiko
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Jun 5, 2012, 3:54 AM

Post #7 of 49 (11215 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

I looked around the inside for any visible signs of damage. on the circuit board it looks like solder melted through the board in some parts, including a path that leads to the horizontal output transistor. Check it out let me know what you think:

http://imageshack.us/.../20120604203845.jpg/

Also cracks around the outside of the screen....

(This post was edited by SykoMiko on Jun 5, 2012, 3:56 AM)

jts1957
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Jun 5, 2012, 7:58 AM

Post #8 of 49 (11209 views)
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Solder is normal.

Quote

Also cracks around the outside of the screen....

SAY WHAT?

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Location: Far, Far Away

SykoMiko
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Jun 5, 2012, 9:36 AM

Post #9 of 49 (11205 views)
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Re: [jts1957] Samsung crt tv will not turn on. [In reply to]	Can't Post

What I meant was, there's this putty insulating stuff around the edges and back of the screen... you can see it in the pictures...it's cracked. I'm not sure if that affects the function of the TV, just looking at it though makes me think it's damaged possibly due to heat

jts1957
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Jun 5, 2012, 9:57 AM

Post #10 of 49 (11203 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

Brown epoxy on the ?YOKE? being cracked should present no problem at this time. Smile

-------------------------
Location: Far, Far Away

(This post was edited by jts1957 on Jun 5, 2012, 9:57 AM)

mel
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Jun 5, 2012, 10:20 PM

Post #11 of 49 (11182 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

I don't have much info on this model but the HOT is the transistor on the heat sync facing the back by the flyback. Read the resistance between the middle and left pins the reverse the leads. You should read infinite in one direction and less in the other. If it shows a short, replace it.

(This post was edited by mel on Jun 6, 2012, 1:24 AM)

SykoMiko
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Jun 6, 2012, 4:16 AM

Post #12 of 49 (11172 views)
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Re: [mel] Samsung crt tv will not turn on. [In reply to]	Can't Post

I desoldered the collector pin on the HOT from the board, plugged the TV in, and the LED light on the front of the TV came on. I then hit the power button, and the LED blinked once and nothing else happened.

I then desoldered the HOT completely and checked resistance between the emitter and collector and vice versa, yep it's shorted.

Obviously the HOT needs to be replaced. Does anyone also think I might have a bad flyback transformer too?

(This post was edited by SykoMiko on Jun 6, 2012, 4:19 AM)

mel
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Jun 6, 2012, 8:42 PM

Post #13 of 49 (11157 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

prolly not Blush

jts1957
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Jun 6, 2012, 10:18 PM

Post #14 of 49 (11152 views)
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If driver transformer and flyback joints are soldered well and the new transistor immediately shorts again ... possibly.

-------------------------
Location: Far, Far Away

SykoMiko
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Jun 8, 2012, 12:05 AM

Post #15 of 49 (11139 views)
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Thanks for the help. I've decided to scrap the TV.
I read that you can test for a bad flyback by desoldering the collector pin on the HOT, and if you get no video and good audio, then you have a bad flyback. The HOT, flyback, and ICs are common problems in Samsung CRT tvs, so I might have a bad ic too. I estimated the cost for all 3 to be about $75 or more, assuming I can even track down the right parts.
Not worth it for such an outdated tv.

Ron.M
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Jun 8, 2012, 12:21 AM

Post #16 of 49 (11135 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

SykoMiko;....

Quote

I read that you can test for a bad flyback by desoldering the collector pin on the HOT, and if you get no video and good audio, then you have a bad flyback.

Sorry to butt in here , but , I can tell you unequivocally that that is NOT true...

Have a GREAT day & weekend... Sly

....

Later...Ron.M... Cool

...
Veteran & Retired TV technician

mel
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Jun 8, 2012, 1:33 AM

Post #17 of 49 (11131 views)
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Isn't it worth spending a few bucks on a new HOT on the probability that that is your only problem?

SykoMiko
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Jun 8, 2012, 8:05 AM

Post #18 of 49 (11127 views)
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Well thanks for setting me straight Ron. The source I read that from sounded like he knew what he was talking about, but I guess you can't believe everything you read. I want to study electronics engineering at my local community college so I can know these things for sure for myself.

And Mel, I think I will try that after all. I found one on ebay for $5... It's a fairchild J6920A

http://www.ebay.com/...1a95355#ht_971wt_711

(This post was edited by SykoMiko on Jun 8, 2012, 8:06 AM)

Ron.M
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Jun 8, 2012, 6:00 PM

Post #19 of 49 (11119 views)
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SykoMiko;.....

1st off;.....
Did you get that number off the transistor or did you cross it ???
2nd;....
NEVER , EVER , NEVVVEEERRR order ANYTHING from an eBay seller that is in CHINA !!!!!
ALWAYS read where the item ships from !!!!
Note the location & warranty from this seller;=>...

Quote

Item location: china, China
14 days money back, buyer pays return shipping ...

I see all kinds of problems getting that transistor from that seller....
Delivery time will take 10 days to 2 weeks...
(Estimated between Mon. Jun. 18 and Mon. Jun. 25)
Is it really going to be worth return shipping costs if you need to send it back ???...NO!!!!...So you'll eat it...

IF J6920A is not the original number , please post the number on the transistor & let us go to work & find you a replacement....THANKS... Smile

....

Later...Ron.M.... Cool

....
Veteran & Retired TV technician

jts1957
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Jun 8, 2012, 7:07 PM

Post #20 of 49 (11112 views)
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Careful Ron, sellers might catch on and "spoof" where they say it's shipping from. Crazy

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Location: Far, Far Away

SykoMiko
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Jun 8, 2012, 8:34 PM

Post #21 of 49 (11107 views)
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Not sure what you mean by "cross" it, but yeah the number came straight from the transistor. I uploaded a picture of it on imageshack... from top left to bottom right it reads:

(d) (4)
F
J6920A
G03
http://imageshack.us/...554146080100927.jpg/

I couldn't find it anywhere else on the web except ebay. Hope this info helps

mel
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Jun 8, 2012, 8:40 PM

Post #22 of 49 (11105 views)
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It crosses to an NTE2665 which you should be able to buy locally.

SykoMiko
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Jun 9, 2012, 3:45 AM

Post #23 of 49 (11097 views)
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Re: [mel] Samsung crt tv will not turn on. [In reply to]	Can't Post

I found the datasheets for both transistors

NTE2665 http://www.alldatasheet.com/...155/NTE/NTE2665.html

And my Fairchild J6920A is actually FJL6920 http://www.fairchildsemi.com/ds/FJ/FJL6920.pdf

I noticed the specs are similar, but do not match 100%

mel
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Jun 9, 2012, 4:04 AM

Post #24 of 49 (11095 views)
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Re: [SykoMiko] Samsung crt tv will not turn on. [In reply to]	Can't Post

It DOES cross reference even with the FJL. Go to the NTE Electronics website to check it out.
I used NTEs for years with no problems.

(This post was edited by mel on Jun 9, 2012, 4:24 AM)

SykoMiko
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Jun 9, 2012, 6:39 AM

Post #25 of 49 (11090 views)
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ok great. I'll see if I can pick up one of these from Radio Shack tomorrow...Besides the web or radio shack, do you know where I could pick up one of these? I'm almost certain Wal mart does not stock transistors Wink

and i'm not sure where else I could find them

(This post was edited by SykoMiko on Jun 9, 2012, 6:39 AM)

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