Question about Sanyo PDP-42H2W 42 in. HD-Ready Plasma Television

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Sanyo Sucks re DP50474 PLASMA

No picture or sound, called Sanyo, and waited on the phone for almost an hour to just get the runaround !

Never will buy Sanyo again!

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Call back and ask for a supervisor. I had the same problem and they are replacing the boards in my TV but I have to pay the labor. Insist on speaking with a supervisor.

Posted on Jan 13, 2009


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Sanyo DP42740 plasma tv went out after a power surge caused by a thunderstorm. Now when I plug it in a small relais (I think) on the main board is clicking but tv won't come on. What is wrong?

I would not agree that Sanyo's support sucks based solely on the fact that they refuse to give you technical details.

if you need the schematics I can probably find them for you, but I bet you this is not the only thing you will ask for.

Supporting others is what really sucks because the reward for helping someone is having another 10 people coming for help.

And basically one of a 100 will consider paying for what they receive in return.

Consider this: a power surge may have hit the power, but may have also struck through the data cable.

The TV could have one or both of its main boards defective - the power board and/or the main board.

You start by making sure the power board produces all the voltages it is supposed to produce and if it isn't then you know you have a problem there.

As you may have seen this is actually a Panasonic power board and if you're in the industry (or if you do some research) you'll find that power boards are the Panasonic's weak spot just as Y-SUS boards are known to be bad in many LG plasma TVs and buffer boards are known to be the culprit of many Samsung TVs.

Long story short, I'd test every power transistor on that board for a shortage and I'd try to manually power it up to see where it fails.

There are usually 3 stages of activating a plasma power supply: 1) standby voltage (front LED present; always on); 2) main board and amplifier power (PS_ON); and 3) display sustain power (VS_ON).

If all that sounds too complicated then what you need is to go eBay and buy the cheapest board 1AV4U20C52300 that you can find.

Before doing so, though, make sure that's the same board you have in your TV.

Sanyo releases completely different models under the same model identifier and DP42740 may not even be a plasma at all depending on the chasis.

Hope this helps...if it sucks I guess I can at least consider myself Sanyo support level :-)

Bobby @

Aug 24, 2012 | Televison & Video

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I heard a pop sound from the back of the tv and then no picture but still had sound

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I have a sanyo DP42746 42in. Plasma. NO picture no sound.

EVERY brand has failures.

This is why I recommend buying the extended warranty. The repair would cost about $300-400. It is most likely the power supply, you could replace it yourself, but the parts are very hard to find.

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Dear Support, This is about a 42'' Sanyo plasma HDTV model no: DP42746. It's my mom's, and at ''84'' it's her window to the world. So it needs to get fixed, please help! It was working fine, then all...

Hi Ed,

The only thing you can try is leaving the TV unplugged for an hour so the TV can discharge and reset itself.

If this doesn't work, then we're talking about maybe a power supply board problem for the screen itself. Most manufactures call it a Blacklight Inverter Board. I would use the warranty for the TV if there is any. The TV repair shop maybe expensive for this type of repair. So, get a price quote first. That way you can decide if is easier and cheaper to buy a new TV for her.

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Sorry you wont get any help from Sanyo or Wallmart. Buy another TV repair people will take your money.

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