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I have had a couple of DA-4 chassis songs like that 34XS955 34XBR960, but I don't remember that 5 blink fault. The 955 had an interesting problem where it would randomly (sometimes first drift red) go completely red screen with retrace lines and shut down when it was somewhat humid...If you could give it a knock before shutdown it would fix it's self. Tried floating the heater (figured heater cathode short) and while that briefly reduced it it didn't fix it. Was going to swap the neck board but the 960 presented it's self cheap before I got around to it.
The service manual can be found free on the net and explains how to get into the service menu if you need to adjust grayscale. Write down all the values before you change anything as well as the resolution and modes you are in (some settings have multiple values and each different one will only display and adjust depending on resolution of signal or picture user preset mode.
A lot of these sets come from factory with excessive overscan. I've gotten good at fixing that in the service menus.
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