Question about Pioneer SD-643HD5 64" Rear Projection Television
When I turn on the standby button it comes on, but the green light will not come on when I turn on the small power button
In most cases the fix for this is simple if you know how to test and find blown fuses. The same happened to mine and it takes 5 minutes to fix and $4 from radio shack.
1) turn off and unplug the TV
remove back panel from TV (like 5 to 10 screws)
2) locate the small fuses on the circuit board -- they are slightly right of center and kind of hidden behind taller componets. There are several, some "standard" size, some shorter GMA-type. In my case it was one of the shorter GMA 4 or 5 amp ones that had blown.
3) find the blown fuse with a test meter (no or limited continuity)or by taking each out and giving it a visual inspection. DON'T TOUCH ANY OTHER ELECTRONIC COMPONENT -- some parts can retain a electric charge long after the TV is unplugged and you don't want to get zapped!
4) replace with fuse of same type
5) re-install back cover.
As a note, while I was in there I cleaned my 3 CRT lenses, they where very dusty, used a Canon optic lense cloth.
Also, I have found that once my fuse blew for the 1st time it happens now periodically (once every 3 months or so), so I assume it is a symptom of a greater problem, however this fix is so easy and I keep extra fuses on hand that I haven't called tech to check it out (TV is kinda old anyway).
If you would like a better explaination than this, search the web because it seems to be a common problem and there are a lot of posts on it (www.hometheaterspot.com)
Posted on Jan 24, 2008
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If your Sony Wega will not turn on, the front green light blinks, you hear a faint whirring sound and the green light turns red and flashes, it probably means the lamp inside the set is no longer working. If you noticed the screen beginning to dim in the preceding days or weeks, this most likely is the cause.
If the green light flashes and the picture comes on momentarily but then goes off, and the green button flashes until the set restarts, then the seal around the lamp mount is loose and needs to be refitted.
If the picture on your Grand Wega cuts in and out and the green standby light flashes, both of the set's STKs need to be replaced. STKs are small chips on your television's circuit boards and are identifiable by their labels. The specific STKs used in your Grand Wega TV will be identifiable by the numbered labels on top of the STKs.
When you plug in your Sony Wega and hear a loud popping sound, it's probably caused by a defect in the high-voltage circuit. Let the professionals take care of this one.
If, after turning on your Sony Wega, you can hear your set but the screen is black, you most likely need to replace your projection lamp.
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