Badcaps.net Forum
Go Back   Badcaps Forums > Electronics Theory and Troubleshooting > Troubleshooting TVs and Video Sources
Register FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 07-02-2013, 07:19 AM   #1
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

I read a lot about bad caps on these TVS, but could a intermittent loss of picture be caused by caps? I will turn it on and sometimes it works fine, shut it off and turn it on later with no picture. No other symptoms like cracking or popping.

Before, I tear into it and look for swelling caps, can caps fail like this?

Thanks in advance,

Bill

Wnowickiz is offline   Reply With Quote
Old 07-02-2013, 07:28 AM   #2
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Capacitors would not be a typical suspect with this problem. In a dark room, when the picture is gone, can you see a glow from the screen or not? (Backlight)
__________________
Please do not PM me for help and support. Questions belong on the public forum.

70 LED/LCD TVs, 5 monitors, 26 plasma TVs, and 2 AVR 6.1 amplifiers saved from the dump!
Totally free service manuals database: http://www.toms-service-manuals.com/ (Contact me for requests or contributions.)

I have successfully fixed (from best --> worst build quality):
1 Pioneer KURO 9G, 10 Panasonic LCD/Plasma, 1 Sony LCD, 1 NEC Plasma, 2 Yamaha HTS, 5 Sharp LCDs, 5 Toshiba LCDs, 7 Philips Plasma/LCD, 1 Hitachi Plasma, 10 LG LCD/Plasma, 16 Samsung LED/LCD/Plasma, 1 Thomson Plasma, 1 Atec LCD, 1 Hanspree LCD, 1 Xerox LCD, 1 Harwa LCD, 2 Proview LCD, 2 Hyundai LCD, 1 "Onn" LCD, 1 Grundig LCD, 1 Dell LCD, 1 iiyama LCD, 1 Acer LED, 1 Logik LCD, 1 Baird (China) LCD, 6 Bush LCDs, 19 Vestel LCDs
tom66 is offline   Reply With Quote
Old 07-02-2013, 09:15 AM   #3
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

I will check thanks. I am pretty sure it does not have a glow, but what would be if there isn't one?

Thanks again.
Wnowickiz is offline   Reply With Quote
Old 07-02-2013, 09:26 AM   #4
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

T-con or main board w/ glowing screen.
Inverter, power or main board w/o glowing screen.
tom66 is offline   Reply With Quote
Old 07-02-2013, 10:44 AM   #5
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

I made need a scope to check those things...
Wnowickiz is offline   Reply With Quote
Old 07-02-2013, 01:04 PM   #6
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

You usually won't for most LCD TVs, but it can help to have one.
tom66 is offline   Reply With Quote
Old 07-02-2013, 09:05 PM   #7
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

The tv is working great tonight. Go figure.
Wnowickiz is offline   Reply With Quote
Old 07-04-2013, 09:44 AM   #8
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

I tried the TV this morning and the screen is blank, no backlight and sound is working. Now what?
Wnowickiz is offline   Reply With Quote
Old 07-04-2013, 10:43 AM   #9
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Take the cover off, and provide clear pictures of each of the boards in the TV.
tom66 is offline   Reply With Quote
Old 07-04-2013, 10:03 PM   #10
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Ok, will do.
Wnowickiz is offline   Reply With Quote
Old 07-07-2013, 02:40 PM   #11
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Here you go. I do not see bulging caps anywhere.
Attached Images
File Type: jpg image.jpg (1.36 MB, 16 views)

Last edited by Wnowickiz; 07-07-2013 at 02:41 PM..
Wnowickiz is offline   Reply With Quote
Old 07-07-2013, 02:43 PM   #12
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Second pic.
Attached Images
File Type: jpg image.jpg (1.16 MB, 19 views)
Wnowickiz is offline   Reply With Quote
Old 07-07-2013, 03:24 PM   #13
kc8adu
Super Moderator
 
kc8adu's Avatar
 
Join Date: Nov 2003
City & State: dayton ohio
Posts: 7,417
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

replace all secondary caps and resolder everything attached to a heatsink on that power supply.
that is not an led set either.
i see these often.
kc8adu is offline   Reply With Quote
Old 07-07-2013, 08:01 PM   #14
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Ok, thanks. All the can style caps or the others also? Should take any readings prior?
Wnowickiz is offline   Reply With Quote
Old 07-12-2013, 03:24 PM   #15
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

I tested all the diodes and transistors in circuit. DB851 and db803 appear bad (both directions). Could those be the cause? I am looking for a schematic for the BN44-00134D. Thanks again.
Wnowickiz is offline   Reply With Quote
Old 07-12-2013, 03:35 PM   #16
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Intermittent would be unlikely to be caused by a permanent failure.
Schematic of PSU if it's any help:
http://www.toms-service-manuals.com/...df&mfg=Samsung
tom66 is offline   Reply With Quote
Old 07-13-2013, 01:14 PM   #17
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

You were correct tom66. The replacement diode did not fix anything. Should I test the voltages prior to changing out. All the caps? Thanks again.
Wnowickiz is offline   Reply With Quote
Old 07-14-2013, 01:24 AM   #18
tom66
Badcaps Veteran
 
Join Date: Apr 2011
City & State: Leeds (University)
My Country: UK
Line Voltage: 230Vac 50Hz
I'm a: Student Tech
Posts: 27,181
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Yes, check all the voltages on the output side, in particular check the backlight on/off signal CN1803 pin 1.
tom66 is offline   Reply With Quote
Old 07-14-2013, 06:16 AM   #19
Wnowickiz
New Member
 
Join Date: Jul 2013
City & State: GA
My Country: United States
I'm a: Knowledge Seeker
Posts: 13
Default Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

Thanks.
Wnowickiz is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 06:40 AM.


Badcaps.net Technical Forums 2003 - 2014
Powered by vBulletin ®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Did you find this forum helpful?