Question about Hitachi 53UWX10B 53" Rear Projection Television

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Screen is Extremely Dark!

Quite some time ago, I was given a 53UWX10B, and told that it had "convergence problems". I verified that it did (I don't remember a brightness issue at the time), and replaced both of the STK 392-110 ICs on the convergence bd., but the screen is too dark to read the menus to set convergence! I can receive various channels, hear audio, and see just enough to know that the tuner and everything else seem to be working. I have the service and operator manuals, and I'm pretty certain that all of the various voltage indicator LEDs are lit. I tried to manually increase the brightness via the menu, but for some reason am not able to (I *think* it is currently set at 60%). I read the service manual instructions & looked at the illustrations, but every time I try to increase brightness, the menu disappears. I just can't see well enough to know if I am selecting the proper icons or not. The only way that I can just *barely* read the words on the menu (yellow lettering on black background?) is with the TV in a completely darkened room.

The only other thing of note is that I noticed that a multi-wire cable (PDS1) from the "Sensor P.W.B." was incorrectly plugged into a connector on the front of the Digital Convergence Unit on the convergence bd., instead of on the convergence bd. itself. It doesn't seem to matter if this cable is plugged into the wrong socket, the correct one, or left disconnected.

Can someone please help? I have the service & operator manuals, a DVM, and one semester of DeVry Institute of Technology education on TV repair, circa 1979(!). There isn't a listing of my problem in the trouble-shooting section of the service manual. At the very least, I can follow advice. Thanks in advance!


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  • cchiang1 Aug 22, 2008

    I didn't understand what you were trying to tell me in your first sentence. My screen was dark ALL the time. I did a word search of my service manual for "zd-309", and could not find a zener or any other diode with that number. However, I did turn up the upper three adj. pots (R, G, B screen adj. VR) on the small black plastic assembly facing the front of the TV (behind the front panel). This assembly also has three adj. pots for R, G, B focus. The whole assembly is shown as a "FOCUS PACK (UFPK)" on page 62 of the service manual. I now have plenty of screen brightness.

    Thank you, Big Irish!



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Good Day, Cary;
Cause: SHORTED ZD-309.

Also, increase Screen controls at front of TV and see what pix brightness does . Hopefully you did check brighteness & contast levels. When adjusting Sreen controls set contrast control at about 90% and brightness at about 50%.
Good Luck, big IRISH.

Posted on Aug 21, 2008

  • MICHAEL MULLINS Aug 24, 2008

    Good Day, Cary;

    If the picture is dark when OSD, conrtast menu level are changed, suspect defective diode ZD-309. Try to increase the screen controls , on front of TV, so you can observe the menu.

    Good Luck, big IRISH.



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Good Day, Butchilee,
Sounds like you have patience, hope your TV has some trace left. Hit recommends that you replace the originals with
STK-392-150's and the resistors. Replace said items with care then back down on the screen/ focus controls and gradually bring the screens up until you have pic, adjust focus. Go into customer menu and adjust color down, set brightness to 50%, contrast to 100%. Then go back and adjust the screens for proper, black/white, tracking. AND It's best to double check the soldering connections.
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