Question about Sanyo DP42740KNB 42 Class Plasma HDTV - 720p, 1024 x 768, 16:9, 600Hz,

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I have a sanyo dp42740. when i turn it on the led turns green and the screen turns a light gray and then it shut off all takes about 5 seconds.

Its not the power supply board

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  • Sanyo Master
  • 8,617 Answers

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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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 135 Answers

SOURCE: 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

Posted on Aug 23, 2009

budmrtn
  • 11361 Answers

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.

Posted on Dec 24, 2010

  • 82 Answers

SOURCE: I have a Sanyo 42 inch T.V. and it suddenly shut

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

tvhelp-Dave
  • 178 Answers

SOURCE: sanyo 42 inch lcd dp42647 - turns on, video audio pulse on off

Need s to be replaced the main board.

Posted on Apr 17, 2010

  • 2 Answers

SOURCE: My Sanyo DP32649 Will not turn on. The green light

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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1 Answer

I have a Sanyo dp42740 plasma TV , the green light on front comes on for about 2 seconds and goes off. what is it?


Hi Gray,
Please try giving 13V from external source. When we exhaust all the options of changing boards we try such things to get the set working. I hope it helps.
Good luck

Aug 04, 2015 | Sanyo Televison & Video

1 Answer

DP42740 plasma TV. Why won't it turn on?


Order your boards from the manufacturer of the TV go to their website they be happy to send them and I will get a refund from shopjimmy

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1 Answer

What causes the sanyo DP42740 plasma tvs green power light turn on and off?


These blinks [flashes] are fault indication (Error Codes).From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it.This will make repair easy.These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times.Count it carefully.If you wish to get some details, check the site linked here.It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.Viewing it in "Mosaic" or "Magazine" will make surf easy.
http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given.Surf the site with patience.

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1 Answer

Sanyo pro xtrax projector


Lamp LED should be lit when the projector is in Standby. However, the problem you are describing sounds like one of two issues. Either the lamp is bad and needs replaced, or there is a power supply fault. If you have tried replacing the lamp already, make sure you reset the lamp counter or the projector may still not function properly.

does the temp warning light come on when the projector shuts off? if so you may also try cleaning the air vent filters and ensure there is proper air flow around the projector. if that checks out then have the projector serviced as the power supply is likely suspect.

Dec 09, 2013 | Sanyo Office Equipment & Supplies

1 Answer

Sanyo dp42740 tv shuts off and on still has picture and sound


Two places are suspect---one is the manual on/off button on the set--actual button may look ok but it is common to have the momentary switch under it be bad in this way.

Second area to suspect is the power supply inside the set switching on and off because of a defect there or the control circuit that turns it on and off.

May 24, 2012 | Sanyo Televison & Video

1 Answer

I have been given a used Samsung TV without manual and have no idea how old it is or the exact size of this particular TV however, it is bigger than a 42''. I have written down the model code, serial...


The front panel LED light indication "LAMP" flashes?Change the the tv projection lamp or LED lamp first,see what happen?Than go from there?Tvs with "LAMP" LED indication light flashes,tv 1 1/2 or 2 years old use like 4 or 5 hours a day.The projection or LED lamp or bulb,inside life span is over.Require changing LED lamp or projection bulb.

Sep 10, 2010 | Samsung Televison & Video

1 Answer

Lamp replace light is still one even though i replaced the bulb


I'm having this same problem. The Ready light is on Green and the LAMP light is on Red. Replace Lamp light is also on. The device turns on, displays the blue SANYO boot screen for a few seconds, then shuts off.

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1 Answer

When turned on green light flashes and no picture


Check the Lamp if no picture, audio may be present. Screen is completely dark. Lamp LED flashes 2X every 5 seconds, Power LED flashes GREEN for 140 seconds then flashes RED.
Check the ballast if no picture, audio may be present. Screen is completely dark. Lamp LED flashes 3X every 5 seconds, Power LED flashes GREEN for 140 seconds then flashes RED.

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2 Answers

No power on Hitachi 50UX588


Most likely have a regulator problem. Remove rear cover, look down on the main chassis, turn tv on watch the board to have some colored led's lit, usually a red one and couple of green. If the red is out, its your regulator, if a green one other problems off the circuit with green led are causing the tv not to power up.

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