Unplug your TV and run a jumper wire between prongs. Use the ohms setting on a multimeter to verify continuity. If the cord is good it's probably your power supply.
SOURCE: sanyo lcd tv flat
I have researched this problem and it is so common we that own this piece of junk ought to form a class action suit and sue. It is caused by a bad part or bad connections to a part called a backlight inverter. It seems the LCD needs a higher voltage than supplied by the 12vdc power pack so this part re-chops the DC voltage to generate the LCD requirement.
The date of manufacture is on the back of these TVs and all the problems seem to be from those made in 2006 to 2008
SOURCE: missing power cord 12v
go to radio shack get a 12 volt 1500ma power supply with I belive it is a N% plug end but any how 800 ma to 1500 ma should run this and the plug end is standard plug with plus 12 volts on the inner side and negitive on the outer case side look at the back of the TV or the old power supply it sould have info on voltags and amprage, and the plug as to inner voltage and outer voltage on the plug any old time radio shack or electronics shop should be able to help you bring in the flat screen if need be as if you know its 12 volts then It wont mater weather you use a 1000ma 1500ma 12 volt ubnaversale power pack as the tv will only use the current needed so more MA is good the only concrn you have is the right mini barrle plug and the right side of +/- voltage on that mini plug being most use + voltage in the inner most circle and - 12 volts on thje outer
SOURCE: my sanyo plasma flat screen tv will not come on....
For what it's worth, you can download the official
Sanyo repair manual for this TV (DP42746) at http://www.eserviceinfo.com/downloadsm/43343/sanyo_dp42746.html.
I uploaded it here when I had some issues with this TV last year.
The solution almost always seems to be to replace the Power
Board and the Upper and Lower Y Buffers. The parts and costs (from Sanyo in
July 2009) are listed below (NOTE: Sanyo will not ship these parts to anyone but
a repair shop):
1. V4 Y-Main (Y-Sustain) Circuit Board (Part #
LJ92-01200A, Alt Part # LJ41-02759A) - USD $139.00
2. Upper Y-Buffer
Circuit Board (Part # LJ92-01202A, Alt Part # LJ41-02760) - USD $64.00
3.
Lower Y-Buffer Circuit Board (Part # LJ92-01203A, Alt Part # LJ41-02761A) - USD
$64.00
Sanyo charges USD $10.50 for shipping, which brings the total cost for
parts to USD $277.50. From my research, a shop would probably charge between
USD $500 and $700 to do this repair.
FYI - there is a class action lawsuit pending against Sanyo for this
issue. The V4 Y-Main (Y-Sustain) Circuit Boards fail VERY frequently in this TV
due to overheating. Hope this helps.
SOURCE: my flat screen sanyo tv screen wont turn on. the
Try disconnecting the connector KBL on the main board as shown in my picture #DSCF0585 to see if the backlights will come on, if it does, the main board is bad.
Also check the voltages on the output connectors of the power supply.
http://s807.photobucket.com/albums/yy352/budm/SANYO%20TV%20DP26649/
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
Failed TV and Monitors: 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.
Please post back what you find.
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