20 Most Recent Samsung LN55B640 LCD TV Questions & Answers


Could be either a function board or smps. Does it come on long enough for you to see a source, or just attempt to come on and power back off repeatedly?

Samsung LN55B640... | Answered on Apr 17, 2014


check for blown fuse, if the fuse is good replace bulged capacitors. if still doesn't works tried to remove the connector going to the inverter board for screen back light might have shorted line that can cause of power failure.

Samsung LN55B640... | Answered on Aug 04, 2012


when the fuse always blown, it could be a shorted component at the power supply board or the main board was affected during lightning where in some of the component get burned then cause a shorted line.if you don't have an idea in any electronic repair just leave it to the trained technician to do the works. hope this can help you thanks for using the fixya.

Samsung LN55B640... | Answered on Jul 22, 2012


First, HDMI is not a perfect hook-up solution. Cable box connections via HDMI are notorious for being problematic. The best thing you can do is contact Samsung and get the latest firmware for your TV.
Samsung Customer Care: 1-800-Samsung (1-800-726-7864). If this does not resolve the issue, connect the cable box using Component cables instead of the HDMI. Component cables are HD also. I hope this was of some assistance.

Samsung LN55B640... | Answered on Apr 07, 2010


you ave a faulty power supply, undo the back and check for bulged caps and replace it.
fosg2000, Rate me

Samsung LN55B640... | Answered on Apr 02, 2010


The problem is the LCD panel went bad, it can't be repaired, you have to replace it.

Samsung LN... | Answered on Jan 16, 2018


back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Samsung LN... | Answered on Nov 18, 2016


Caps can fail with no outward signs. It takes a special meter to test them. Your set may have a back light inverter that powers the back lights. When it fails, the picture cant be seen, but you have sound, to check this look for a picture on the screen using a flashlight

Samsung LN... | Answered on Mar 17, 2016


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

Samsung LN... | Answered on Jan 18, 2016


Could be power supply failure. It tries to start but can't.

Samsung LN... | Answered on May 16, 2015


flicking or shutting down,i have the same tv,mine shuts down,it needs power supply,yours needs the control board,get one on ebay

Samsung LN... | Answered on May 11, 2015


Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubles hooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Samsung LN... | Answered on Mar 15, 2015


Page 64 of the user manual explains this procedure.
Go to Global Download Center and under Manuals, click See More + and then click on Download PDF.

Samsung LN... | Answered on Mar 03, 2015


Hi, not sure if you have the same fault as i had, but our tv only had half the screen go off, after looking up on the internet i found a video for a fix, what you need to do is remove the back cover, there will be ribbons that go from the front screen to the main panel, i removed each one at a time and rubbed the contacts of the ribbon with a rubber on the end of a pencil, plugged them all back in and switched it on and it was now spot on, thats more than a year ago and its still working spot on, hope this helps
jim

Samsung LN... | Answered on Mar 01, 2015

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