A local customer dropped off their Viewsonic Pro8500 because the new lamp assembly did not resolve the issue and they felt there was something deeper going on because of the odd behavior of the projector. When plugged in, it would slowly spin up the fans and emit a high pitched buzz. The LED would change states with the button press but no image and no color wheel response occurred.

The voltage into the mainboard was checked and found the 12V line to be a very unregulated 8.5v which led me to find bad capacitors in the power supply.

Since this is a 10yr old projector, repair cost was a big consideration. It was also needed back asap. I did not have 1000uf@16v capacitors on hand so I opted for 25v variants. They do sit a little V shaped but they will function just fine.

A few things of note: This chassis is identical to the Viewsonic Pro8400 and Pro8450. It is very very similar to the BenQ W1200. They use different wattage ballasts but the power supply, fans, and optics are very similar. I also believe it's the same general chassis as the Mitsubishi XD280U. You will see the power supplies side by side.

If you happen to need a good Osram inside replacement projector lamp, use this link and put in code YT50 at checkout for 5% off. https://www.purelandsupply.com/viewso...

The lamp for the BenQ W1200/W1200+ is here, you can use the same YT50 code: https://www.purelandsupply.com/benq-l...

Thanks for watching!

\o/

00:00 Intro
03:00 Door switch demonstration(don't break this!)
03:45 Old lamp assembly evaluation
05:30 Focus ring removal
05:50 Case screw removal(most of them)
08:02 Found missing screw
08:50 Keyboard wire
09:01 Disassembly continues
14:30 Initial voltage tests
16:01 Mainboard-Power supply removal
23:03 Identify bad capacitors
23:40 BenQ W1200 Power supply comparison
24:17 Capacitor replacement
31:25 Begin reassembly for testing
43:30 Lamp assembly screws stripped, replaced with longer screws(common problem with this chassis)
47:16 Initial testing
48:45 Voltage check
50:05 Reassembly continues
1:00:49 Dust spots in DMD block
1:01:50 Optic assembly cleaning
1:05:10 Final testing / lamp timer reset
1:08:22 Closing remarks