I have a hitachi 55pma550 plasma tv.when I turn on the main switch red light comes on standby. But when I turn on tv the red red light on stand by turns green only for 10 seconds and goes red no picture no sound.please tell me what is the problem? Thanks

There are bad capacitors on the power supply board. Parts can be had here:
TV Parts Universal TV Stands DLP Chips ShopJimmy

Servicing by opening the back cover should be performed only by a qualified service technician.

First do you see a light indicating that the TV has power? There are two power buttons on the TV (the main power and the regular power button). The red standby light will light up when the main power switch is on. This indicator is just to the left of the remote I/R sensor. You can find the main switch on the bottom front of the tv (it is under the tv forward of the stand). Turn on the Main power if it is not on. Then try the power button on the control panel of the TV again.

Does the standby light change color or blink? (Red is standby, orange is power savings (no signal), blue is on.) If the main switch is on and the standby light doesn't come on, the TV has a problem at the power supply. Try unplugging the unit for a bit (at least 30 seconds) and then plugging it back in. This will reset the internal circuitry. If you see a blinking light, then the TV is reporting a self-test failure. I do not know the codes for this model Hitachi Plasma TV.

The manual for the Hitachi P50H401 TV is available from Retrevo: http://www.retrevo.com/support/Hitachi-P50H401-TVs-manual/id/1233ci869/t/2/ . You will need to enter a code to access the pdf.

I'm assuming you don't have one of the special versions that were intended for large audiences that were only controlled by remote (no control keys on the front of the TV). Remotes.com has the original remote or a substitute remote if you need it. See http://www.remotes.com/remotes/servlet/rs?a=gmi&uuid=13104063628240&smodel=P50H401&brand_pn=HITACHI_P50H401 .

I hope this helps.

Cindy Wells

I have Hitachi 55PMA550 the problem is that when i switch on the light turns green and nothing happens and then i swich off it turns red

If completely dead not led, then first change fuse and try again if blows again then there is a short in power supply, I would look to find the replacement board at places like shopjimmy.com etc

unplug the unit for a while like one hour or so.

looks like main power supply is not working. Board replacement only.Unless TV shuts off. Then, it might be other things.
Good luck.

I have the same thing with my tv standby button comes on red flashes green then back to red need answers can u help if u can plz thanks

I have had this problem in some models of plasma sets before. In most cases the power supply and main drive boards had to be replaced. In a small number of cases the failure was the screen itself.

In all cases, the cost of the repair was expensive. For the screen failure, the set was scrapped.

Jerry G.