Samsung lcd no power, no nothing!


	FORUM HOME	SEARCH POSTS	WHO'S ONLINE	LOG IN	RULES F.A.Q.

TV Forums: TV Equipment: TV Repair Forum:
Samsung lcd no power, no nothing!

Print Thread

YooperJ
New User

Jun 12, 2013, 8:23 PM

Post #1 of 20 (7165 views)
Shortcut

Samsung lcd no power, no nothing!	Can't Post

I have a Samsung LN32C450 built Apr 2010 that worked for about 18 months and then quit. No nothing, no sound, picture, power light, clicking or anything. Capacitors look good and fuse tests okay. Any ideas?

yooperj

jts1957
Veteran

Jun 12, 2013, 11:25 PM

Post #2 of 20 (7155 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

They don't build 'em like they used to. Be thankful it made it past warranty. Time to buy a new set. Laugh

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

YooperJ
New User

Jun 13, 2013, 4:32 PM

Post #3 of 20 (7144 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Used less than my 40 year old Zenith 12" and it still works!! Power supply board bad???

board repairs
User

Jun 13, 2013, 5:11 PM

Post #4 of 20 (7141 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Odds are yes but did you check the voltages going to the digital main from the power board ? Do you have the 12v or 5v or 3.3v ? Sometimes these voltages are marked on the power board . Without testing were just guessing .

YooperJ
New User

Jun 13, 2013, 6:54 PM

Post #5 of 20 (7139 views)
Shortcut

Re: [board repairs] Samsung lcd no power, no nothing! [In reply to]	Can't Post

The only voltages I got were out of pins 6 & 7. Voltage was 13.7. Other pins have nothing but I can't turn on the power so I'm not sure if they should have voltage present or not. I see some capacitors are marked 5v, 10v, 25v & 35v.

Thanks,
John

board repairs
User

Jun 13, 2013, 8:41 PM

Post #6 of 20 (7137 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

What is the board # ? No 5v ? Sounds like a bad power board .

YooperJ
New User

Jun 13, 2013, 9:23 PM

Post #7 of 20 (7135 views)
Shortcut

Re: [board repairs] Samsung lcd no power, no nothing! [In reply to]	Can't Post

BN44-00338B model P2632HD-ADY is the number I see on the board. The sticker would be CN07BN4400338BDC077210932

thanks!

(This post was edited by YooperJ on Jun 13, 2013, 10:11 PM)

YooperJ
New User

Jun 15, 2013, 6:38 PM

Post #8 of 20 (7104 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Any suggestions on what to do? Since I have no power light, would it be the power board?

Thanks!

jts1957
Veteran

Jun 15, 2013, 7:37 PM

Post #9 of 20 (7102 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

13.7 volts on 6 & 7? Of what? Connector ?CN802/CN803?

Raw B+ across CP801 cap?
A5V across CP854 cap?

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

YooperJ
New User

Jun 15, 2013, 8:32 PM

Post #10 of 20 (7098 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

The connector coming out of power board going to main board CN802 from (2) pins B5v on row 1 of the connector read 13.7vdc. cp854 reads 5.23v and cp801 reads 167.8v. all volts are dc.

Thanks

jts1957
Veteran

Jun 15, 2013, 11:26 PM

Post #11 of 20 (7089 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Is voltage changing at RB858 (100 ohm) each time you press the power button?

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

(This post was edited by jts1957 on Jun 15, 2013, 11:32 PM)

YooperJ
New User

Jun 16, 2013, 7:59 PM

Post #12 of 20 (7077 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

I don't see that resistor on any of the 3 boards.

I really appreciate your help!!

YooperJ

jts1957
Veteran

Jun 17, 2013, 1:09 AM

Post #13 of 20 (7068 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

IP Board

Base of QB851 < RB858 < PS_ON

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

YooperJ
New User

Jun 19, 2013, 1:18 AM

Post #14 of 20 (7049 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Where is the IP board? I looked at the 3 boards I can see. Viewing from the back of the set, 1 is under a shield on the far right side (high Voltage), another is in the middle right with capacitors on it (Power board?) and one is on the left side with all the A/V connections on it (Main board?). Am I missing something? What is the IP board?

I appreciate all the help I can get!!!!

Thanks,

YooperJ

jts1957
Veteran

Jun 19, 2013, 7:00 AM

Post #15 of 20 (7046 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Inverter / Power Supply Board.

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

YooperJ
New User

Jun 20, 2013, 5:10 PM

Post #16 of 20 (7028 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

The only thing I see with those numbers are capacitors staring with a CP. Is thee I/P board the one with the capicators and electrical cord plug on it?

jts1957
Veteran

Jun 20, 2013, 5:58 PM

Post #17 of 20 (7026 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

My bad. Brain f*rt.

Just power supply. Inverter IS the thin long board on right.

Also see I forgot board/set schematics.

http://elektrotanya.com/...egoria=&kat2=all

Put part location in search box in pdf.

http://elektrotanya.com/...egoria=&kat2=all

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

(This post was edited by jts1957 on Jun 20, 2013, 5:59 PM)

pnb
New User

Jun 23, 2013, 1:13 PM

Post #18 of 20 (7004 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Check the safety capacitors also (close to the mains supply [yellow rectangles]) they lose storage capacity over time but show no visible deterioration. De-solder and test capacity. I came across on once that had dropped from 470nf to 2nf.

YooperJ
New User

Jun 23, 2013, 4:01 PM

Post #19 of 20 (7002 views)
Shortcut

Re: [jts1957] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Thanks for the schematics, I was able to find it on there but not on the actual board. I have to be missing something somewhere. Is it located on the Inverter board or the Power board in the middle of the set. The Power board list the actual part where the other 2 boards I see list a reference number.

I appreciate your help!

Thanks,
YooperJ

YooperJ
New User

Jul 8, 2013, 7:39 PM

Post #20 of 20 (6929 views)
Shortcut

Re: [YooperJ] Samsung lcd no power, no nothing! [In reply to]	Can't Post

Do you think replacing the Power board will help?

Print Thread

Search for (options)

- Page loaded in: 0.22 s on (CGI/1.1)