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Post by jeremy on Feb 25, 2014 17:20:07 GMT -5
nothing spins up or makes noise other than the relay. It just does the LED/relay thing and that's all.
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Post by jeremy on Feb 25, 2014 17:18:57 GMT -5
Those appear to be what I need MT, thanks
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Post by jeremy on Feb 25, 2014 17:17:38 GMT -5
Yeah I can do that, I'll get some pics upped in a bit
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Post by jeremy on Feb 25, 2014 14:28:09 GMT -5
Yeah I've opened them both up and done some checks on the PS units and ballasts, couldn't find anything. I didn't think to check the main logic board, which may be a possibility I suppose (I had a Epson HC 8350 that had a similar issue, but it was related to a couple of bad 5 pin ICs on the logic board)
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Post by jeremy on Feb 25, 2014 13:06:00 GMT -5
Neo Geo - 4 white buttons and 2 joy sticks!! Awesome parody music video - I hope you can get it fixed, its a classic!!
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Post by jeremy on Feb 25, 2014 13:04:25 GMT -5
Well I thought since that was a projector website maybe someone there had one and just happened to have the same problem, and THEN possibly know a fix for it, lol. Anyway, no, there are no other LEDs flashing, it just does what was described before. Like I said, I'm at a loss since I've never seen a no power issue like it
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Post by jeremy on Feb 25, 2014 11:09:17 GMT -5
Working on one of these and its almost repaired. There was a bad diode that blew which was blowing the main fuse, I replaced it and the fuse and nothing blows anymore, but I still get no power. I figured I'd ask about this even though I know its a crapshoot in hell since I doubt anyone has a schematic for the Hi-pro PSU.
But it never hurts to ask, and aside from this little issue the switch is fine, would love to get it going if possible.
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Post by jeremy on Feb 25, 2014 11:03:13 GMT -5
MT, I have this Denon AVR 2307ci you and I worked on a while ago. It's almost done but I need the service manual/schematic to identify the small surface mount diodes on the bottom of the mainboard. They are all that's left and I don't know what they are.
Wondering if ya can help me out here so I can finally wrap this beast up after all this time
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Post by jeremy on Feb 25, 2014 11:00:36 GMT -5
These projectors have been repaired. The problem with these projectors power supplies are the capacitors (not surprising with ViewSonic). These capacitors must all be replaced on the power supply board. This board is in the back of the projector, under the lamp ballast, which is under the logic board. This projector is very complicated and tight for space to assemble and disassemble. If you haven't worked with electronics before you may want to take it to someone you trust. Take your time when disassembling the projector so you do not damage any cables or components.
Once the capacitors have been replaced on the power supply, reassemble the projector carefully, and completely. You are now ready to test. Before testing, make sure your lamp is installed and secured with the screws, and that you have the lamp cover closed and screwed in so it does not open. Plug the projector in and power it on, you should see the power LED switch to off, then shortly after the projector will engage and the bulb will ignite. Your projector is now successfully repaired.
Enjoy!
Thanks to Frankens for finishing the capacitor list!!
Capacitor list: 22uf 50v c208
47uf 35v c204
47uf 35v c107
10uf 50v c116
4.7uf 400v c113
330uf 16v c239
1000uf 16v c236
1000u 16v c214
680uf 16v c216
Main Filter cap: 180uf 450v
Read more: repairalmostanything.com/thread/75/viewsonic-pjd6531w-projectors-power-fixed#ixzz2xGhdkxxa
Original Post:
Got a couple of these little guys here, they seem pretty decent for their specs.
Problem with both of them: You can plug them in, the blue LED ring around the power button fully lights up, pressing the power button makes the blue LED turn off, and a relay click is heard. Nothing happens for a few seconds.
The projector then makes another relay click and the LED comes back on. Then it makes another click, which after this last click, the projector will allow me to attempt to power it up again, but the same result is had each time.
I have 2 good (supposedly) bulbs here for these projectors. I doubt they are both bad, they both look like brand new, and they are original ViewSonic bulbs.
I looked at the power supplies and ballasts, but couldn't find any bad capacitors/diodes/resistors off the bat. Without a schematic or service manual I really don't know where to proceed from here. Hoping I can get some help on these.
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Post by jeremy on Jan 11, 2014 19:26:39 GMT -5
MT, sorry I haven't replied in a few days. I've been busy and haven't gotten a chance to get that IC tested. I needed to order some more parts anyway because I'm running low on stuff around here, so I ordered a bunch of the parts that were in the VSX-09TX as well (including those ICs and a bunch of the transistors on the pre driver board).
I'll get back to you on the IC test as soon as I can get some spare time though. I would like to get this receiver finished since I got the rest of the matching components to go with the system now. (and I'm excited to hear it with the rest of the system)
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Post by jeremy on Jan 6, 2014 18:42:11 GMT -5
Checked IC903 and Q946. Voltage on IC903 seems stable at +14.5v and -14.5v, on Q946 the voltage is +4.98v on one lead, +0.493 on the other outer lead, and zero v on the center lead.
They don't seem to fluctuate on either of those parts.
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Post by jeremy on Jan 6, 2014 10:09:13 GMT -5
Ok back, sorry I didn't reply when I said I would, got a bit busy. Anyway, I went ahead and checked all those parts you asked me to and they all check out fine. I did replace those fets in the FR channel as well as the emitter resistors. They are all soldered in place and the receiver does power up with all the cables plugged in as normal, both relays click on, no smoke from the pre-driver board, but the voltage is still fluctuating on the FR from +0 to +20v DC, and the FL does the same as I mentioned before, only it goes from 0v to +5v and it seems to stabilize back to normal more often than the FR does. I'll give myself one thing, I sure know how to pick the "good ones"
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Post by jeremy on Jan 3, 2014 22:21:53 GMT -5
Sounds like a plan, Ill get back to you tomorrow with the results
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Post by jeremy on Jan 3, 2014 21:36:49 GMT -5
I pulled the 2 FETs from the FR channel, didn't put any new ones on, just put it back together and checked for DC on the speaker terminals. The receiver comes on, stays on, both power and amp relays click, no smoke coming from the pre-driver board,... but there is voltage on the FR still, and it jumps all over from 1.5v DC to 19v DC quite randomly, the FL also does the same thing only in negative voltage, and it seems to be quite lower from -30mv to -6v DC.
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Post by jeremy on Jan 3, 2014 20:54:32 GMT -5
I have some new FETs I can install, Ill remove them first and check, then if the DC is gone ill put the new ones in and re-check
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