So I have this hitachi WX4021N, and another hitachi (WX3015WN) and they both have the same problem. When you plug them in, the power LED blinks a couple times as normal before going to standby/ready. When you press power, the power LED turns green for a second or 2 at most, the projector powers up for about as long, and then shuts off, the power LED then blinks as it did when first plugged in, and is back in the standby state. Pressing power again repeats this endless cycle.
The one I'm concerned about is the WX4021N, as I have the full service manual for it with the schematics for the PSU. I found a cracked solder joint on the 450v 4.7uf capacitor, which I replaced, as well as replaced the rest of the capacitors on the PSU with new ones just to eliminate them as a possibility right away.
The cracked solder joint nor the capacitors were the issue, I did some quick checks of some of the IC's and transistors and they appeared to be fine. I haven't done any voltage checks yet, but then I just got the SM myself before I started this thread.
The service manual can be found on ET (I cant attach it as it's too big), any help on where to go from here would be appreciated
Unfortunately none of those issues on page 35 or 36 describe the exact issue I'm having with this projector. When it is plugged in, in standby (orange power LED and thats all thats lit), if power is pressed, the power LED lights green for a second or 2 and then the projector fans make a quick spin-up noise, then the whole thing shuts down, the power LED blinks orange twice, stops, blinks twice more, and is in standby/ready state again.
The way the LED blinks before power on, and after the failure, is normal, so they don't really tell me anything. I can however leave the projector in standby, plug a network cable in, and navigate the web interface the projector has. If I try to power on the projector the web page freezes and the projector powers up and shuts down as it would if I pressed the actual power button.
All settings are on default as well, so I know its not the mainboard. I also know its not the mainboard, as I have a working one of these. I swapped the PSU from the good one to this one and this one worked the way it should, and the good PJ used with the PSU from this PJ did not work, so I know its the PSU.
Anyway, as I mentioned above, LED's don't act abnormal, and none of those conditions describe the projectors behavior. :\
I have tested the voltages yes, though I was only able to test in standby as it doesn't stay on long enough for my meter to get an accurate reading while on. I put the voltages I read in the photo attached below:
Since your testing appears to say it is surely the P/S and seeing how the output voltages look correct then we have to look directly in the P/S. I think I would first look at any protection circuits. Look for PC102 and locate the end with the 2 pins that connect to B2 of transformer and pin2 of ic102 and blob some solder on there to short those 2 pins and try firing up the projector again.
Last Edit: Dec 6, 2016 11:38:12 GMT -5 by mastertech
Well I'm certainly one for camping out aren't I? Sorry I haven't gotten back to this MT, I had 4 other projectors that I had to get repaired, so I didn't have time to get to this one. A couple of them had blown PSU, ballast, and PSU Filter boards (lotta blown parts basically).
Anyway, back to this projector. I finally have time today to work on it, so I'll get that done what you suggested last, and see what I find!
zjjxhzf: hello Gabor i am DLP projectorColor wheel is not accurate，setup memory， the phase angle cant setting for the color wheel ，must use service code.
Sept 19, 2017 1:31:25 GMT -5
mastertech: Hi stranger. Guess you spent your summer cruising on that street bike.
Sept 17, 2017 21:43:54 GMT -5
nashou: Hey everyone, just saying hi ! Hvent been here for a while hope you're all doing well !!
Sept 17, 2017 19:19:25 GMT -5
mastertech: Parts for repair are no longer available.
Sept 11, 2017 19:42:24 GMT -5
mayavi: my pioneer elite VSX-92TXH it freezes until I unplug and then it won't power on until maybe 10 minutes. came to know that its a common problem in this model. any help would be much appreciated......
Sept 11, 2017 13:39:10 GMT -5
jaredjaric: Thanks so much Hulio :), your expertise is very much respected
Aug 20, 2017 9:25:37 GMT -5
Admin: james: you need to post in the thread where your problem is being discussed.
Aug 9, 2017 19:51:54 GMT -5
james: Yes Sir All wiring was connected.
Aug 9, 2017 7:46:15 GMT -5
Admin: I have uploaded a copy of the SM to the digital projector section.
Jan 10, 2017 20:21:56 GMT -5
ducki: sorrry for my bad english ....(google translate
Jan 10, 2017 17:44:21 GMT -5
ducki: I have the same defect as a cp-x4021n you but can not start it ... I did the same trials with ic202 pc102 and still do not like, I make short pin 1 and 2 of the pc102 and PJ light (orange) goes off ... you can help me with a service manual for this PJ? TNX
Jan 10, 2017 17:43:46 GMT -5
jlb12: pwr switch off = 2(0.0) 3(11.7) 6(.04) 7(.04)
Dec 13, 2016 23:27:03 GMT -5
jlb12: No Problem. Thank you for all your help.
Dec 13, 2016 0:20:40 GMT -5