Question about Pioneer SD-641HD5 64" Rear Projection Television
I've been looking at the forums to find this problem I'm having and I'm stumped.
It was working fine for the part two years (I got it used, but theprevious owner stated it had no problems with him either) with noproblem what so ever.
About a week ago, I turned my rear projection on and it immediatelywent back to standby. I unplugged it and let it set for some time, andthen plugged it back in, it auto-turned on, and then went immediatelyto standby. Okay, something is wrong I thought. So I pulled the backcover and on the AC board (to the far right if you look at the back ofit, a LED (location D118) was lit up. No other lights I could see.Seeing other posts, I removed the power board and found numerous coldsolder spots. I corrected that problem and then reattached the boardand powered on the set, it went back to standby again immediately. Ilooked again and now I found that besides the led D118 was lit, thepower board had blown fuse FU206, I replaced the fuse and plugged itback in, it blew the fuse again. Checking the schematic, it led me tobelieve that the AMP board was the fault (specifically theSTK392-040s). A suggestion in one of the forums was to remove theSTK392s to see if it blew the fuse afterward. I did so, and I found aton of cold solder joints on AMP board also. I corrected them and thenreattached the amp board with the STK392 missing. It powered up and wasworking, minus the convergence was all jacked. I didn't bother to doanything, so I powered off the set and ordered the STK392 replacements(the exact ones, not generics). When the new ones arrived, I installedthem and then plugged it back in. it went back to the standby lightimmediately, and the LED D118 was lit up again. NO other leds are onany of the other boards. The forums mentioned to check for an led onthe other boards so I looked with the lights turned off in the room.Nothing. I'm baffled on where to go next.
So far the process done its perfect and i want to go the last paragraph:... IT powered up and was working minus the...
i want to take it here because as you can see you tv can work without the convergence. As soon as you can get back to this step i consider it a good symptom.
Because the change of the amplifiers is good step but can finish the repair or cannot. Maybe some resistor in the area or in the supply of +- 20 v cannot let you work
I recommend to return to this loop as needed. The convergence area is an amplifier. Any short and i mean Any it would increase the current and the protection works as needed in the main power supply who doesn't tolerate any current error.
To continue with the second line about LED's:
Yes, this tv has several Leds around power sources and they lit when the areas finally are working ( but remember your set gets into shut down) but when it doesn't work, this leds are not trustful source of troubleshooting. Keep us informed about your finding.
Posted on Apr 22, 2009
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Posted on Jan 02, 2017
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