Benq PB6100 won't turn on...any ideas? - Page 2

Hey guys! Digging a very old thread here!

I have the same problem, i just woke up and i swear i could hear something humming it was my BP6100 fans, as you can imagine i leave it 24h per day connected to the Power outlet, and as it seems i burned a Cap.
I will replace it in a few days so hang on as i will tell you the result

Does anyone have more information on this topic? My BenQ PB8240 just died with less than 650 hours on it and I'm about to take it apart to look at the capacitors. I will take pictures and provide information as time allows.

Hey guys! After three weeks I finally got a day off work and this morning I took the projector apart. I didn't discover any popped capacitors or anything out of the ordinary so I put it back together. Then I plugged it in, and now it works just fine! I have no idea why it wasn't working before.

Before, when I would turn it on, the back fans would start up and get really loud and it seemed like it was trying to turn the lamp on but didn't have enough power? I am not very good at diagnosing electronics problems but after I would press the on button on top, it would run the back fans and then I heard what sounded like a ballast turn on and then nothing would happen for about two seconds. Finally, red red "lamp" led would come on indicating a problem with the lamp.

Also, I have always turned both the top and side power buttons off, completely turning power off to the unit when it was not in use. Is it better for it to just leave the main power on and have it sit in standby?

Thanks!

Same problem here. Just ordered the Panasonic AX200 as a replacement, hope that is a good projector. I took mine apart and it is the internal fan which is perpendicular to the rear fans that is spinning. I did not see any capacitors that looked messed up, but I didn't spend much time with it.

It started doing this a few days ago.

got a 470uf cap blowned up, a quick check on all other sytems seems fine.. i suspect i have a burnt resistor in the same board as well... syncmaster750b have you checked the green resistor? is it Orange, Red Yellow? or Orange Brown Yellow?
42 Kohms, +/-5% or 41 Kohms, +/-5% the difference isnt much from Red to brown, but anyway just to be sure, grab a multimeter and check your resistor as i suspect mine is burned as well... (havent checked mine, it's just a suspicion)

i have to get my multimeter badly (and my soldering iron too)

Hey guys, same luck here: got it to work, but it turns on goest ot he first cycle (the white screen) then it would click into the second state and show what's going on...
I suspect the power board is still damaged, i will inspect other components
cheers
dan

I had the same problem as SyncMaster750b earlier. Thanks to this forum I knew to look inside my BenQ PB6100 projector and learned that I have exactly the same blown cap as the other people did. I checked all the other sub boards and everything else looked fine. This one board appears to be the power supply/conditioning board, which makes sense that the rest of the projector can't get going without it.

I'm off to Radio Shack to find a 470 micro Farad electrolytic and a baby soldering iron. I'll repost my results. The resistor on the same board in my unit is orange brown yellow, and doesn't appear damaged.

Brion K.
Orange, CA

Sounds like anyone using this particular PJ might want to change that cap BEFORE it blows and takes out some other parts with it. I still have my 6100 but i'm saving it as a backup to my Mitsu 3000. I did start it up about 5 months ago and it worked fine. I may change the cap proactively. Seems like when it goes it causes much more trouble after the fact. just a thought.

Follow up to my post yesterday: I changed the 470uF cap and now the unit starts up and runs but the lamp is not bright and the screen looks like cottage cheese, kind of like the beginning of the Twilight Zone without the door or the fake eyeball.

I had a real hard time making a clean solder on one side of the cap so i wonder if that's causing the problem with the video. The fans work, the cool-down on shut-down works, and the logic on the control panel lights seems normal. The menu does not display and the blank screen button does not work, however.

There's nothing left to lose so I guess I'll try more aggressively to resolder that connection and see what happens. Very frustrating that a $2 capacitor can end the life of a $800 projector. Harumpf.

hey guys, i am going to fish for the problem in the next few days, i will be working night shift leaving lots of time for whatever i want to do, i will definetly tear this projector piece by piece and check if everything is in order.
Please follow this thread and if you have any input just reply to this
many thanks

hey guys, i told you to stick to this thread as i found the problem
The main system board (the one that connects to the main DLP chip behind the lens, and has the SVGA and SVideo Ports) has a faulty SMT Capacitor too...

Here's the picutres of my mainboard:




And here's the schematic


Sorry for the Portuguese annotations, i posted this same picture in a Portuguse electronics forum asking for their opinion.

According to the schematics this might be a 10uf 20v Film Capacitor, i am not sure about the values because as you can see the schematics says 10U (as in 10uf) and has an "M" that i dont know what it means..., probably Micro but i am not sure!
Anyway, i will keep you guys posted and lets see if we can get this thing working again

If anyone has an comment about this please reply
also if you are lost and you dont know how to take of the system board i would say it's prety easy, you have about 2 or 3 screws holding it down, plus you have to take all the flat cables and other cables that go to the system board...
Plus there's a huge cable that connects to the DLP and that's hold down trough a black piece of metal also screwed down, be extra careful with that!

Guys! Green light! it's definetly a 10Uf Capacitor, the M means that it's 20% tolerance.
Even tough you may not find a SMT type capacitor (the small type etc...) i do think that a normal tantalum or ceramic cap might do the trick, altough i would advice you to ask on your local electronic store about that
i will be off until monday, i will give you news afterwards

Here is one more with the exact same capacitor blown on a PB6200. Don't think I'll bother trying to do the fix given the lack of success of others here.

Oh well, I needed an excuse to buy a 1080p projector anyway.

that will soon change! please stick with this topic and lets fix it!

My PB6100 just went today....damn! just bought a PS3 today and wanted to see how it would look on the big screen...timing sucks :-(

I noticed the low level fan noise and LED lights illuminated and the projector wouldn't "turn on".

Luckily found this thread and opened the unit up. Low and behold, the same cap popped (25V 470uF). I removed it and will look for one locally on Monday. Didn't see anything else damaged, but didn't look on the main board yet.

These were great little projectors, would be good to get a few more years out of them. If the recent activity on this thread is any indication, there will be more and more people popping their caps in the coming days.

Let's work together and stick to the thread to see if this can be fixed.

you came just right on time!

buy one of these:
http://cgi.ebay.co.uk/Tantalum-Chip-...d=p3286.c0.m14

or if you are in usa:
http://cgi.ebay.com/80-Kemet-10uF-10...3286.m20.l1116

the search word is 10uf 20v tantalum try to get at least 20% tolerance on those

Btw, i am going to ask you guys a little favor
I dont know if i can get these tantalum caps in Portugal and i am not sure if i can use other type of caps like ceramic or electrolytic... ( i am going to start the hunting monday )
if i cant find them anywhere here i would ask anyone who lives in UK os US and has the ability to find me one of these, while you buy them for yourself would you mind to buy an extra one for me , and put it in an envelope ship it here? i would gladly pay you for that, as someone asked me about 30 bucks just for shipping them from US and 7£ (arround 10bucks) from UK (my second bet) i would be glad if i can save a few bucks

i forgot that today is an holiday and the stores are closed...
gonna leave that for tomorow
if you find the tantalum 10uF 20V M (20% or better tolerance) cap, please tell me

Hi, if you dont have that cap blowned out, check at the shcematic and try to measure the filter that you have before the cap, they are made to be blowned out before the cap itself i was suprised that my cap blew up but the filter didnt...
you might wanna take a look
cheers

hi, but have you figured out that the filter might be off? take a multimeter in that and see if you have any passage, also, if you need to replace it, just get your soldering iron and heat it up a little bit and try to prise it off

I replaced the blown capacitor and did an inspection of the main board (nothing else seemed blown). Re-Assembled the projector and success! It is working again.

I guess I was lucky that the capacitor blowing didn't take anything else out.