Black Issue [Hitachi 50VS69A]

ShetiPhian · 23rd August 2009, 03:02 PM

I think my problem is in the control.

My 3 lcd rptv (Hitachi 50VS69A) wont turn off blue pixels when switching to black.

To test my set I connected a laptop and sent full screen colours

Blue to Black = Blue
Cyan to Black = Dark Blue
Magenta to Black = Dark Blue

Red to Black = Black
Green to Black = Black
Yellow to Black = Black

Blue to Red = Red
Blue to Green = Green
Blue to Yellow = Yellow

My thoughts are:
If my blue lcd was going I should see a blue saturation in all colours, but its just affecting black. therefore the controller isn't telling the blue pixels to turn off when switching to black.

I was also thinking: Perhaps the colour ramps are off, how do I adjust this?

Anyhow, looking forward to comments.

sheldonstv · 22nd April 2010, 01:17 PM

common fault this-3 major things can cause it
ssc panel faulty,ssb panel faulty(could be software but unless you have compair you are stuffed,you cant get into service mode to change settings without it),and the lcd panel itself may be faulty in which case the set is scrap.
unless you have the necessary repair experience working with sm parts and double sided plated thro pcbs the ssb panel for you is unrepairable as is the ssc panel.take the set to someone who can repair it otherwise open yr dustbin and place it gently inside and buy another one

23rd August 2009, 03:02 PM	#1
ShetiPhian diyAudio Member Join Date: Aug 2004 Location: Belleville, ON	Black Issue [Hitachi 50VS69A] I think my problem is in the control. My 3 lcd rptv (Hitachi 50VS69A) wont turn off blue pixels when switching to black. To test my set I connected a laptop and sent full screen colours Blue to Black = Blue Cyan to Black = Dark Blue Magenta to Black = Dark Blue Red to Black = Black Green to Black = Black Yellow to Black = Black Blue to Red = Red Blue to Green = Green Blue to Yellow = Yellow My thoughts are: If my blue lcd was going I should see a blue saturation in all colours, but its just affecting black. therefore the controller isn't telling the blue pixels to turn off when switching to black. I was also thinking: Perhaps the colour ramps are off, how do I adjust this? Anyhow, looking forward to comments.

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22nd April 2010, 01:17 PM	#2
sheldonstv diyAudio Member Join Date: May 2005 Location: united kingdom	common fault this-3 major things can cause it ssc panel faulty,ssb panel faulty(could be software but unless you have compair you are stuffed,you cant get into service mode to change settings without it),and the lcd panel itself may be faulty in which case the set is scrap. unless you have the necessary repair experience working with sm parts and double sided plated thro pcbs the ssb panel for you is unrepairable as is the ssc panel.take the set to someone who can repair it otherwise open yr dustbin and place it gently inside and buy another one

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