Post by jeremy on Mar 28, 2014 10:09:20 GMT -5
Been getting a couple of these older model Sony HD projectors in, and they are overall great projectors for their age and specifications. If you have one of these and it has suddenly developed garbled video, lines in a certain color (Red, green, blue, or a combination of the 3) then your projector is likely suffering from a worn out power supply.
I've noticed that a few of these that I have here with hours exceeding 7000+ on the chassis, that they will begin to develop a sporatic buzzing sound, bulb will sometimes not ignite, or worst case scenario, your image gets all garbled and turns into crap.
The cause: These 10+ year old projectors are beginning to fail because the capacitors on the power supply. The ESR and capacitance has gone out of tolerance from usage, age, etc... The good news is, after a recap, the projector should come back to life like nothing ever happened!
The power supply on these is located on the front left corner of the projector (when facing the lens), it is about 10" long, 4" wide, held down by 2 screws, one on each end. You will have to disconnect the PSU from the A/C Socket board directly behind the PSU, ballast from the middle of the power supply (its a bit of a pain to get to, so disconnect the smaller wires in front first), and the row of smaller wires in the front of the PSU. Once all that id done, the PSU should easily lift straight up and out of the projector.
NOTE: One tip I think most will find useful: Make sure you use capacitors that PHYSICALLY FIT into the place of the original ones. There is NOT a lot of space on the PSU, and some of the capacitors are right under other parts on the PSU. Take your time when replacing these.
Now, I'll be honest, I didn't have every capacitor on hand to redo the entire PSU, but I did the ones that I suspected would be the cause. Below is a list of the ones I have replaced to return the projector to a working state:
220uf 450v (Both of these capacitors MUST be replaced, they may read okay, but they are over a decade old, and under a load may break down and cause issues down the road)
10v 1000uf (1x)
4.7uf 50v Tall cap (1x)
The below capacitors are under a sub board on the PSU, the sub board has 2 connections connecting and holding it to the PSU, carefully remove this board by pulling it straight out from the sockets to get to the capacitors under it.
4.7uf 50v short cap (1x)
10uf 50v short cap
10uf 50v short cap
Now, remember that sub board that I just had you remove? There is a 220uf 50v capacitor, and a 3300uf 35v capacitor on it that need to be replaced as well.
Once all the capacitors above were replaced in my VPL VW10HT power supply, I reinstalled it, and fired the projector up. My garbled green image was now a perfectly normal image after the repair. I would like to mention that even though I didn't replace every capacitor on the board, I HIGHLY RECOMMEND replacing EVERY capacitor on the Power supply. This will eliminate buzzing, and provide a much longer life span of your PSU and the projector.
The remaining capacitors on the PSU board are the following values:
2200uf 35v (2x of these)
3300uf 50v (2x of these)
and the majority of the remaining little capacitors (about a dozen of them) they are 47uf. I don't remember the voltage of these off hand, but it must at least be what the original capacitors are when replacing.
That about sums it up. Carefully reassemble the projector, some may find it easier to plug all the wires into the PSU board before mounting it back into the projector; whatever works best for you. The projector should now be returned to a fully working state. I cannot guarantee that this will work for every projector of this model obviously, but if your projector is just suffering from getting a lot of use over the last 10 years, then this is more than likely all it will need.
Note: It is also a good idea to clean the optics of the light path (Lens, LCD Prism) if you feel comfortable doing so; to remove the lens and clean it, as well as the face of the LCD prism. Use a non scratch cloth on the surfaces as these surfaces will scratch easily. Use nothing but Dish soap and water on the surfaces! DO NOT rub hard!!! You WILL damage the coating on the LCD prism and lens!!! Most importantly: BE PATIENT!