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Sanyo 42" model # 42848 when i turn it on i have a good picture for about 3 sece then goes black, sound works perfectly

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Probably a failing internal power supply.

Posted on Oct 22, 2013

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Sanyo model 42848


This could be a faulty back light lamp.It is located right at the back of the screen It is an cold cathode lamp supplied by a high voltage from inverter board .Inverter board has a input voltage of 24 volts inverted into 300 volts AC this lamp lights up the screen...
You need to open the back cover to check the lamp.....

Jun 06, 2012 | Televison & Video

1 Answer

My sanyo lcd goes black but i still hear sound.


see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.3_29_2012_12_14_08_pm.jpg

Mar 28, 2012 | Sanyo DP42849 42 in. HDTV

1 Answer

My 42" hd Sanyo flat


chances are your backlight inverter circuit has failed, repaired one a few months back with the same problem. To verify this, take the tv in a dark room. plug it in and take a bright\ flash light and shine it on the screen. turn the set on, you should see either the screen saver or video from your source. If this is the case, your inverter is at fault. Depending on your model, your backlight inverter is built onto your power supply board so you will have to replace the power supply/inverter board. Not hard to do, you can do it yourself with care.

Sep 23, 2011 | Sanyo 42 in. LCD TV

2 Answers

My Sanyo 42" flat screen


There is a problem with the board of your television.That problem is in vertical section, theres a leak capacitor at the vertical section of the board.Its better to replace all the leak capacitor to make the picture back to normal appearance.If you can't do the repair or replacement of of capacitor try,Call a repair technician to do the repair or troubleshooting..Thanks..

Aug 25, 2011 | Sanyo 42 in. LCD TV

1 Answer

I have a Sanyo Tv Model # DP 42848-00. When I turn on the tv all i see is up in the right hand corner video 1 (I can't change it) then the screen goes black. Can you held me with this problem? Thank...


Hello; The LCD panel is the likely cause of this problem. It can cost as much or more than a new TV. Bad inverter board(s). There are usually one to four of these PC boards. They light up the tiny florescent tubes behind the LCD panel. They are just like a ballast in the old florescent lights. The problem is that the manufacturer that made the LCD panel , also made the inverter boards that are in or on it and are NOT available separately. These are the high voltage power supplies that light up the " backlights behind the screen. The microcomputer in the TV watches these come on. If there is something wrong with one, it will shutdown the set.

Jun 27, 2011 | Sanyo 42 in. LCD TV

1 Answer

Sanyo dp42647 picture is black but has good sound worked great yesturday


sanyo lcd dp42647 turns on and has sound no picture black screen

Dec 27, 2009 | Sanyo 42 in. LCD TV

1 Answer

Screen went black on my 42" sanyo model dp42647 lcd


Hi there! The panel may be in protection mode. The Inverter board is the most logical area to start after checking power supply Voltages.(5,6,24 and 13Volts). There may be coils on the Inverter Board which have bad soldering or faulty. Other than this it may be main board which controls switch on or off. If all else fails, refer to a repairer. Beware of High Current!!! Best Wishes and Good Luck, Jus004

Aug 22, 2009 | Sanyo Televison & Video

4 Answers

Sanyo clt1554 has sound no picture.


I have a Sanyo CLT1554 (2 1/2 years old). Has perfect sound but no picture. The picture will come after several times turning it off/on and pressing the Reset button. It is very anoing to do this evey time. PLEASE HELP

Dec 15, 2008 | Sanyo CLT2054 20 in. EDTV-Ready LCD...

1 Answer

Screen goes black but still have sound


MINE TOO AND SANYO TOOK THIS TV OFF ITS SUPPORT WE SHOULD ALL SUE THIS COMPANY gcolella@snet.net

Jul 26, 2008 | Sanyo DP42746 42 in. Plasma Television

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