unsure of screen issue on Hitachi #P50S601

[wolfmantough]

I replaced the two obvious bulging/leaking BADCAPS but have since been stumped. it had no effect. the issue was random, and happened when I powered down the TV... I saw the screen get lines all over it right before turning black.

It currently powers on but... looks like this...





bad caps...




good caps...



anyways, it has been several years since doing any electronic repair so I feel a little overwhelmed. ALL HELP APPRECIATED!!!

[Glitcher]

Re: unsure of screen issue on Hitachi #P50S601

This set has a common problem with bad buffer board ICs. I would check those.

[freakaftr8]

Re: unsure of screen issue on Hitachi #P50S601

that does not look like buffer board ICS. I'm familiar with Hitachis and buffer board failures. this looks more like a main board issue I'm noticing everything's everything seems to be shrunk to the middle and the lines are going vertically not horizontally. Usually when Hitachis short a buffer board the lines go horizontal. what does the screen look like with something actually displaying like a movie or even a snowy Channel? Is the screen only showing the middle one third section? I believe this model has an input board and scalar bored. I would be suspecting either the scalar bored or control board possibly

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

ahhh good question. so like I said, sound works just fine... heres what the screen does to an image :



streched and flattened as well as red/purple lines to green/blue lines.

and heres what the image should look like

[freakaftr8]

Re: unsure of screen issue on Hitachi #P50S601

I'm thinking mainboard. The one.under the metal shield. These are fairly inexpensive on ebay. Just match up part number.

Also could be a firmware issue or a setting error in the service menu. Especially if the board took a surge from the filter caps opening up.

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

Not sure how to access service menus. everything displayed onscreed (menu wise) shows up so far to the left that its unreadable.

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

will you direct me to the board in question? my parts list has them listed under different names (logic, xbus, etc).

[freakaftr8]

Re: unsure of screen issue on Hitachi #P50S601

its called a digital board. Heres a link to one for sale.

http://www.ebay.com/itm/HITACHI-P50S...item1e866ecdfa

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

Ok cool. Thats what I was just looking at. thanks!

[freakaftr8]

Re: unsure of screen issue on Hitachi #P50S601

You can try hitting that board with a hair dryer and see if it affects anything..

BTW, nice Chevy II is that yours?

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

haha what would the hair dryer do? Its ok... I just ordered that board on ebay (and I dont own a hair dryer haha).

no that II was paul walker's, I do have a 73 though...

[freakaftr8]

Re: unsure of screen issue on Hitachi #P50S601

Nice nova!

[wolfmantough]

Re: unsure of screen issue on Hitachi #P50S601

Nice nova!

haha thanks man!