20 Most Recent Sanyo DP42848 LCD TV - Page 4 Questions & Answers

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom (look for discoloration of the circuit board around the base of the capacitor) need to be replaced.If you repeatedly turn it off and on, eventually it'll probably stay on, but every time you turn it off, the unit will get harder and harder to start up until one day it just won't.Sometimes you have to do the opposite to start it up and unplug it for some time and then try again.If you aren't tech savvy, don't worry, read the rest of this solution and watch the videos.If you are handy with a soldering iron and can identify the power supply and/or inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are SURE it's only doing supply output ripple filtering, and even then, you should go OVER, not under the uF rating).Most of the caps that go are 10V 1000uF or 3300uF.I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.http://www.youtube.com/watch?v=Mm51C_RDIZEhttp://www.youtube.com/watch?v=BNHHrgX_6cs&feature=relatedhttp://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwphttp://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=relatedBacklight related video here:http://www.youtube.com/watch?v=6XoF6QZ1dmw&feature=relatedAs you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors, amplifiers, computer power supplies and motherboards, and other electronic equipment.The parts are cheap, and skill required is minimal. A great parts source is Digi-Key, and you can order the parts online at www.digikey.comThey typically cost under a dollar a piece plus a flat shipping rate.The parts usually arrive one business day later.If you watch the third video, you will see that even someone with no soldering experience can perform these repairs as demonstrated by the woman in the video.

I am first wandering how long you have had the tv, and if you have had it for a while this is a good chance that the bulbs may be going out because they are flickering or that you have bad capacitors on one of your boards internally.

Hold a flashlight to the screen after it goes blank, if you can still see anything on the screen, then it is time to replace the inverter boards (there are 2 of them, VIT71043.50 and VIT71043.51).Cheers,Stewart

Check your power outlet for any loose contacts. Look for any loose contacts in RC jacks/sockets/Cable. Try changing the input device to something you are sure, works such as a DVD player.Show a torch light (flashlight) on the screen from a safe distance, when program runs. If you can see the picture, the problem is with the backlight and might require the attention of a qualified service technician.

If you want to replace it yourself, why don't you remove one and take it as a sample to the shop so that you can obtain exact replacement?

Just type service manuals to buy in google, you will get plenty of websites from where you can buy online and download the service manual.

No back lights is clearly one of three issues:1. They are bad.2. They are not getting voltage to operate. (this can be checked)3. They are not being switched on by the circuit that controls them.No back light does not have to mean they are bad, it just means they are not for whatever reason coming on.....

I 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 to buyand 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.If set is opened at least look for puffed up and bad caps like in thisphoto.

This is common with new technologies when people are used to the old CRT tvs that lasted a lifetime. There has been talk of how manufactures are doing this purposely for repeat sales...but I have no proof of those statements from them. Your best bet is going with the BB and filing a claim, but those often get forgotten as well.


Best of luck in your battle!

The same VGA cable you would use to connect it to a computer monitor.

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Most TV's these days are to up date that only DVD player wires will work that is most likely the case sorry

New set?
If you're turning almost any TV on by the manual power switch on it, thats Standby mode.
The next step it's waiting for is the ON command from the remote control.
There are two main methods remotes use to go to ON from Standby:
Press the Power button for both on and off commands
Press any 1-10 (or 1-0) button for on, press power button for off.

Hi,

power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Hoping that this will help out in solving the problem

No, there is no power reset. You need to find out now if the backlights inverter baord or the 24vdc from the power supply is good. Bad cap can look normal but can have high ESR (Equivalent Series Resistance).
Please read my guide to understand in more details, it sounds like you may have multiple baords failure.
Basic LCD monitor and TV troubleshooting guide: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Parts: http://interliquidparts.com/