Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting TVs and Video Sources
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 05-18-2015, 09:00 AM   #181
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

LED backlights bypass using Diode 1N4007.
http://www.badcaps.net/forum/showthread.php?t=46403
__________________
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
budm is offline   Reply With Quote
Old 05-18-2015, 05:22 PM   #182
keeney123
Lauren
 
Join Date: Sep 2014
City & State: North Adams MA
My Country: United States
Line Voltage: 120VAC, 60Hz
I'm a: Knowledge Seeker
Posts: 2,554
Default Re: LCD TV and Monitor basic troubleshooting guides

Quote:
Originally Posted by budm View Post
LED backlights bypass using Diode 1N4007.
http://www.badcaps.net/forum/showthread.php?t=46403
Good for you this looks like an excellent work around.
keeney123 is offline   Reply With Quote
Old 05-22-2015, 03:20 PM   #183
AcGeorgiegirl
Senior Member
 
Join Date: Jun 2013
City & State: Issaquah, Wa
My Country: USA
I'm a: Knowledge Seeker
Posts: 167
Default Re: LCD TV and Monitor basic troubleshooting guides

Thanks...would be nice if you could include what each video link is "about", though!
AcGeorgiegirl is offline   Reply With Quote
Old 06-09-2015, 11:53 AM   #184
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Samsung EEPROM reset:Samsung LE37A556P1F Flashing red light

http://www.badcaps.net/forum/showpos...0&postcount=77

"8 pin SMD EEPROM on the bottom of the board, close to where the CI card slot is.

Most of the time it's from Atmel, so it will have ATML followed by a cryptic datecode in the first line.
2nd line should be either (AT)24C256B or "2EB1" (which is Atmel's cryptic way of saying it's a 24C256B)

You need to short out the clock and data pins (pin 5 and 6). Even without the datasheet handy they're easy to identify cause they always have 100ohm SMD resistors connected to them. Otherwise see attached pic.

Solder 2 relatively long wires to those pins and put the board back in place and connect it all up. Plug the powercord in and when it tries to start up (blinking power LED), short those wires for a few secs. Might take a few tries. Unplug the set, remove the short and grab your remote.

Now plug it in again. It should stay in standby.. If not, try turning it off (solid LED).
Then start the TV up in service mode. You do this with the remote. In order, press INFO, MENU, MUTE, POWER. The TV should start up and display the service menu on top of everything else.

Go into the "Option table" menu, make sure "Tuner" is set to AUTO and "Store Demo" is OFF (use the arrow keys and enter, menu button goes back).
Then do a Factory Reset. TV should turn off after a while."
budm is offline   Reply With Quote
Old 06-22-2015, 11:40 AM   #185
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Samsung LN46A500T1FXZA: power cycling: bad C102 on main board

http://www.badcaps.net/forum/showthr...LN46A500T1FXZA
budm is offline   Reply With Quote
Old 06-24-2015, 11:46 AM   #186
DB379
New Member
 
Join Date: Jun 2015
City & State: Prijedor
My Country: Bosnia
I'm a: Knowledge Seeker
Posts: 2
Default Re: LCD TV and Monitor basic troubleshooting guides

Thanks alot @Budm
DB379 is offline   Reply With Quote
Old 06-26-2015, 10:23 PM   #187
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Samsung BN44-00265A/B
http://www.badcaps.net/forum/showpos...57&postcount=7

Per TOM66:
Consider JP852/JP854 jumper cut - can help solve flickering backlight but maybe also no backlight?
budm is offline   Reply With Quote
Old 07-06-2015, 12:01 PM   #188
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

http://www.badcaps.net/forum/showthr...ps+blow&page=2

Just FYI for caps blowing even at correct Voltage.
budm is offline   Reply With Quote
Old 07-06-2015, 04:05 PM   #189
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Another example of why the new caps on the power supply board go bad:
http://www.badcaps.net/forum/showthr...615#post572615
budm is offline   Reply With Quote
Old 07-08-2015, 08:57 AM   #190
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Sony Bravia KDL-32XBR4 324046whc6lv2.2 TCON fix.
Multiple color lines on the screen.
http://www.badcaps.net/forum/showthr...034#post573034
budm is offline   Reply With Quote
Old 07-13-2015, 09:27 AM   #191
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

LN46A750r1F no backlight due to PWM line stuck low.
Solved by paulstef:
http://www.badcaps.net/forum/showthr...180#post574180
budm is offline   Reply With Quote
Old 07-14-2015, 01:46 PM   #192
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Service bulletin for PHILIPS, MAGNAVOX, EMERSON blowing main fuse, thanks to JDC.
Attached Files
File Type: pdf PNFSB0027.pdf (55.9 KB, 315 views)
budm is offline   Reply With Quote
Old 07-17-2015, 03:27 PM   #193
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

I do not know why the post comes on twice, ADMIN please delete one of them, thanks.
SONY TV LCD panel/T-CON listing from year 2010.
Attached Files
File Type: pdf SONY Manual_LCD_PANEL_9883805A10_sm_2010.pdf (696.3 KB, 476 views)

Last edited by budm; 07-17-2015 at 03:29 PM..
budm is offline   Reply With Quote
Old 07-17-2015, 03:37 PM   #194
Oglon3r
New Member
 
Join Date: Jul 2015
City & State: Minneapolis MN
My Country: USA
I'm a: Knowledge Seeker
Posts: 12
Default Re: LCD TV and Monitor basic troubleshooting guides

Outstanding guides!!
Just got an element TV with white coloration. You can see menus and what not.
Will do the testing but after a very basic review of the guys my gut tells me it is possibly the Tcon board.
Thank you for your hard work!
Oglon3r is offline   Reply With Quote
Old 07-17-2015, 03:45 PM   #195
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

You should start a new tread with the make and model, the pictures of what is showing on the screen, the pictures of the whole backside of the TV. It sounds like you have bad GAMMA IC problem on the T-CON that will cause washed out pictures on the screen.
Washed out picture samples of bad GAMMA IC on the T-CON board.
Attached Images
File Type: jpg bad GAMMA IC on T-CON.jpg (308.8 KB, 72 views)
File Type: jpg bad GAMMA IC on T-CON_2.jpg (199.7 KB, 64 views)
File Type: jpg bad GAMMA IC on T-CON_3.jpg (343.6 KB, 65 views)

Last edited by budm; 07-17-2015 at 03:57 PM..
budm is offline   Reply With Quote
Old 07-17-2015, 04:39 PM   #196
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

The Anode of the LED string is connected to the output of the boosted converter, the Cathode of the last LED string is connected to the Drain of the PWM MOSFET, the SOURCE pin is connected to one end of the current sensing resistor, the other end is then connected to the boosted converter ground return.
The example shows 4 strings, two strings are connected in series to form one long string, so there are two long strings with two LED drivers.
Attached Images
File Type: jpg LED drivers Samsung_BN44-00357A_[SCH].jpg (270.8 KB, 134 views)
Attached Files
File Type: pdf LED drivers Samsung_BN44-00357A_[SCH].pdf (59.4 KB, 402 views)
budm is offline   Reply With Quote
Old 07-28-2015, 09:03 AM   #197
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

LED backlights troubleshooting video by NORCAL715
https://www.youtube.com/watch?v=hh3z_dkkcUM&app=desktop
budm is offline   Reply With Quote
Old 07-28-2015, 09:09 AM   #198
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

VIZIO E320-A0 EEPROM replacement video by norcal715.
https://www.youtube.com/watch?v=Sghh8BK5zIw
budm is offline   Reply With Quote
Old 07-28-2015, 09:12 AM   #199
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Samsung LN32B360 Voltages and Troubleshooting video by norcal715
https://www.youtube.com/watch?v=ocqnqmBxiqY
budm is offline   Reply With Quote
Old 07-29-2015, 11:14 PM   #200
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 39,206
Default Re: LCD TV and Monitor basic troubleshooting guides

Sony AZ-1K CTV-61 Training manual
http://www.badcaps.net/forum/showthr...highlight=AZ1K
KDL-xx EX400
budm 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



Badcaps.net Technical Forums 2003 - 2023
Powered by vBulletin ®
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 01:02 AM.
Did you find this forum helpful?