The TV you specified here can only be used with NTSC system transmission or video data. If you wish to see PAL system signals by this tV, you've to buy PAL to NTSC converter, and should connect it according to connection diagram given along with the converter.
SOURCE: DP 42848 Sanyo
It can be the 24vdc power supply problem which supplies the power for the backlights inverter board, or the backlights inverter board is bad, or T-CON board is bad, you need to do this when the screen goes black:
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
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
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
SOURCE: I have a Sanyo Tv
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.
SOURCE: sanyo model 42848 tv parts diagram
Download its service manual. Try this link to download it.
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