Question about Hitachi 57SWX20B 57" Rear Projection Television
I have a Hitachi 57 " rear projection TV and the screen is very dark. What can I do to fix this? Is there a part that I can get that will fix this. 57swx20b is the model number that I have.
Unfortunately it sounds like your CRT's ( picture tubes ) are getting weak. You have 3- red, green and blue. It would not be in your best interest to repair it because of the cost of the crt's and if we can still buy them. A lot of analog parts such as those are very hard to locate and is getting worse by the day.
Posted on Apr 17, 2009
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Posted on Jan 02, 2017
Your problem here has to do with the amount of aging that happens to the three colour tubes - red, green and blue.
Blue actually ages slower than red and green. What actually happens is the green tube deteriorates and due to green being the predominant colour for brightness causes the blue tube`s flyback lines to appear - especially when switching between inputs or when the video is blanked.
No replacing the blue tube will not solve your problem as the tube is actually the best one of the three.
As someone mentioned there is a way to adjust this by removing the speaker grill assembly in front of the set. Doing the service mode adjustment with the remote is not the right way to solve the problem - you would be adjusting the colour gain and off-set values and would seriously be compromising the white balance of the set.
On the left hand side behind the speaker cover you will see a black square block with six adjustment points. Look for the one marked SCR BLUE, Switch the set to a unused input so the blue lines become visible. Now adjust the BLUE point counter clockwise until the lines disappear. A small adjustment should do it, Switch back to a picture and make sure the whites are still white.
This should sort your problem. I would however suggest asking a Sony service centre to do this for you. This is a dangerous thing to do as you will be working close to the 35Kv supply the the anodes of the three tubes.
I hope this answers your question.
Posted on Mar 08, 2008
I have the same TV. I will be buying a replacement Screen for mine as well
Posted on Sep 26, 2008
Here's a link to order the original Hitachi screen assembly for this model (57F59A) from a major parts distributor:
Hitachi 57F59A Replacement Part Screen Assembly
Hitachi 57F59A Replacement Part Protective Screen / Super Shield
Posted on Apr 02, 2009
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