Question about Sanyo DP42740KNB 42 Class Plasma HDTV - 720p, 1024 x 768, 16:9, 600Hz,
Its not the power supply board
That sounds like a mai board issue since I am assuming audio or pic is never seen just gray screen then shutdown.
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
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
Posted on Aug 23, 2009
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.
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:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
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.
Posted on Dec 24, 2010
call to the tv service center and do the required things my dear..........
plz dont try to repair it without any experts becoz tv when switched off also contains many voltage in it...
Posted on Jan 22, 2011
Sounds like the power supply is bad.Do you know anything about working on circuit boards ? I bet some of the capacitors need replacing.This is a quick and very cheap fix if you know how to do it.
On the back of the tv is a panel held by two screws.Remove those and you have instant access to the power supply.Look and see if any of the capacitors are bulging or leaking.
Posted on May 07, 2010
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