Hitachi Plasma P50A102A 3 Green Blinks

[DjKrish]

As stated, this tv is having some issues. Red LED comes up upon plugging the tv, Switch it on with remote and 3 times Green LED blinks. It recycles continuously and nothing happens. I took off the back cover and first checked for any possible cap damages. None, all caps are fine. Then i checked both left and right SDR boards, both was perfectly fine. Checked both Ysus and Xsus boards, both also seems to be ok with no damages on any of its components.

Then i moved to the ribbons of all boards SDR, ysus, xsus etc. Removed each one cable at a time and power up, still same 3 blinks. With all the ribbons attached to the logic board, i unplugged the main cable that connects the logic board to the main board. Wallaaaaa, no more blinking and the green LED stays firm for good but no picture and no sound as usual. Can on, can off and no more blinking. This are the inspection and tests that i did so far. Does this mean that the logic board is faulty? Is that where the ending is? Or the main board could be faulty? Feedback's and valuable inputs are much much appreciated

[DjKrish]

Re: Hitachi Plasma P50A102A 3 Green Blinks

Anyone to help?

[tw2005]

Re: Hitachi Plasma P50A102A 3 Green Blinks

Hitachi stuff is so rare,.

I suspect most of their problems are ysustain/buffer board related.

I've found no manual and from a different model sold here 50" FHD Plasma 3 blinks is listed as Y-SUS, SDM. That's the 50X01.

Generally if there's a fault it's the logic board that will shut down the TV.

So withy the buffer boards have you checked for shorts between gnd and the outputs.

Also post some shots of the layout and the individual boards, someone maybe able to get a better idea to help you.

I've never seen or touched a Hitachi, usually the parts are too hard to find and expensive so i avoid them for repair projects.

[tw2005]

Re: Hitachi Plasma P50A102A 3 Green Blinks

This has no ending but 3 blink and he found a blown buffer IC, looks like he only replaced the bottom buffer and ysus with no luck.

http://www.avforums.com/forums/plasm...v-problem.html

[tw2005]

Re: Hitachi Plasma P50A102A 3 Green Blinks

This link you should be able to download a SM for a A402 which has the same logic board in your picture.

page 29 on has some checks . You may be able to apply that info to your boards for some resistance checks on the x,ysus and SDR boards for shorts.



It's too big to upload here

I don't know if disconnecting the buffer boards and turning on will help but in this post on a different model also 3 blinks they claim it helped.

http://www.hometheatershack.com/foru...-times-20.html

[DjKrish]

Re: Hitachi Plasma P50A102A 3 Green Blinks

Hi TW2005, thanks a bunch for the input. Ive managed to replaced both left up and left down sdr boards plus the ysus board. This 3 are faulty. Now the tv is working perfectly fine. Thank god i had a good friend working in Hitachi and manage to get the parts cheap.

[tom66]

Re: Hitachi Plasma P50A102A 3 Green Blinks

Glad to hear you fixed it. Apart from the odd buffer and Y-sus failure these are fairly reliable sets.