Repairs Thread - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 20 Old 03-22-2018, 08:13 PM - Thread Starter
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Repairs Thread

Hi,

out of my own interest for DIY repairs, and because so many people come to this forum trying to fix their projectors, I've been putting together threads with many different issues.

I have organized these by the symptom rather than by the cause of each issue, so that people may find what they're looking for according to what they're experiencing with their own projectors. I've also indicated the technology (DLP or LCD) whenever that seemed relevant to the issue being discussed. I appreciate any criticism and suggestions for improvement, as well as threads you would like to see listed here.

I intend to keep this thread updated with both new and old issues, but I hope to avoid redundant threads; over the next few days I'll be cleaning it up.


IMAGE
Off-color
Spots, blobs, stains, etc
Lines, bands and bad pixels
Focus, blur and distortion
Ghosting/crosstalk
Flickering
Light bleed/leak
Dimness
White/black image

OPERATION
Completely dead
Is alive but does not power-on
Bulb does not light-up
Overheating

NOISES
Grinding
High-pitched, whine
Loud fans

INPUTS
Input error/slowness
General connection issues

BROKEN/CRACKED PARTS

MAINTENANCE
Lens, mirrors and glasses cleaning
Bulb replacement
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Last edited by descalabro; 04-29-2018 at 05:20 PM. Reason: Reorganized threads
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post #2 of 20 Old 03-22-2018, 08:20 PM
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Great Job and good effort.
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post #3 of 20 Old 03-23-2018, 06:23 AM - Thread Starter
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Thank you.

As this thread is mostly for consultation purposes and is not likely to generate discussion, I'll post every once in a while so it won't disappear.

4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | JVC X30 (RS45)
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post #4 of 20 Old 03-23-2018, 08:08 AM
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Thank you for this. I'm one of them, who has an issue, with a Benq W1070(from dreamer). It won't power on, just the power button blinks. There are people on this forum, who can help with the repairs?

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post #5 of 20 Old 03-23-2018, 02:42 PM - Thread Starter
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Quote:
Originally Posted by tibimakai View Post
Thank you for this. I'm one of them, who has an issue, with a Benq W1070(from dreamer). It won't power on, just the power button blinks. There are people on this forum, who can help with the repairs?
you're welcome.

What color is the blinking? The other leds are off?

Usually, an orange blinking power light means the projector is on cool down routine. Meaning that maybe it's stuck on that routine for some reason. Do you hear any louder than usual fan noise?

Last edited by descalabro; 03-23-2018 at 02:50 PM.
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post #6 of 20 Old 03-28-2018, 01:21 PM
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None of the three LEDs are on, or blinking. The only LED, that is blinking(very dim), is the power button LED.
It must be some hardware issue, in my opinion. It used to belong to Dreamer(member here). He thinks that one of the transformers on the power supply is bad.
I'm not convinced about that. I'm getting 12.65V, 3.3V and I have 171V, at the main filtering capacitor. I'm not getting the 385V, that supplies the ballast and the bulb.
I have measured most of the components on the power supply, but I did not "see" anything bad. I can't check properly the two main ICs, because I can't find there datasheets.
I have ordered new ones, and I'm waiting now for them, to arrive.
One thing I would like to know, if do I need turn on signal, from the mainboard to boot up the power supply, or not. Most likely I need it. How can I simulate that? Add a resistor, between the 3.3V and pin #14 , at CN701 connector?
Attached Files
File Type: pdf Benq W1070 PS.pdf (658.4 KB, 8 views)

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post #7 of 20 Old 03-28-2018, 04:29 PM - Thread Starter
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Quote:
Originally Posted by tibimakai View Post
None of the three LEDs are on, or blinking. The only LED, that is blinking(very dim), is the power button LED.
It must be some hardware issue, in my opinion. It used to belong to Dreamer(member here). He thinks that one of the transformers on the power supply is bad.
I'm not convinced about that. I'm getting 12.65V, 3.3V and I have 171V, at the main filtering capacitor. I'm not getting the 385V, that supplies the ballast and the bulb.
I have measured most of the components on the power supply, but I did not "see" anything bad. I can't check properly the two main ICs, because I can't find there datasheets.
I have ordered new ones, and I'm waiting now for them, to arrive.
One thing I would like to know, if do I need turn on signal, from the mainboard to boot up the power supply, or not. Most likely I need it. How can I simulate that? Add a resistor, between the 3.3V and pin #14 , at CN701 connector?
Sorry @tibimakai , but I don't know anything about electronics/circuits or the sort. I made this thread so that people can help each other and find some accessible fixing tips, but you're speaking about knowledge that surpasses me completely. Hopefully, someone else will answer you.

4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | JVC X30 (RS45)
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post #8 of 20 Old 04-04-2018, 04:20 PM - Thread Starter
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Thread updated.
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post #9 of 20 Old 04-09-2018, 07:05 PM
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I'm a step forward, I have found a shorted capacitor, on the main board. Short is gone, but it still doesn't start yet. At least, the power button is green and solid, also the power LED is red.
I need to start measuring all the voltages, to see what is going on.
It could be in download mode, or it is not ready for standby mode. Most likely, the second situation, is the case here.
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post #10 of 20 Old 05-07-2018, 09:19 AM
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I have found a DC/DC converter IC, that it wasn't delivering any voltages. It is a PMD1000 IC, with 48 pins.
Ordered a new one from Aliexpress, replaced it, and it booted right up.
I'm guessing, that the shorted capacitor caused the IC, to fail.
Did a "bit" of maintenance, cleaned the DMD chip, with air blast, cleaned the front glass on the main lens, cleaned the surface of the color wheel, cleaned all the fans, and now it runs like a new one.
Today, I'm picking up a remote for it, for $10(!).
The bulb has a bit over 2800 hours, should I replace the bulb, or I should just use it as is?

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post #11 of 20 Old 05-07-2018, 12:37 PM
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Here are some pictures, with the bad parts.
Attached Thumbnails
Click image for larger version

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ID:	2400040  

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post #12 of 20 Old 05-07-2018, 12:54 PM - Thread Starter
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Quote:
Originally Posted by tibimakai View Post
I have found a DC/DC converter IC, that it wasn't delivering any voltages. It is a PMD1000 IC, with 48 pins.
Ordered a new one from Aliexpress, replaced it, and it booted right up.
I'm guessing, that the shorted capacitor caused the IC, to fail.
Did a "bit" of maintenance, cleaned the DMD chip, with air blast, cleaned the front glass on the main lens, cleaned the surface of the color wheel, cleaned all the fans, and now it runs like a new one.
Today, I'm picking up a remote for it, for $10(!).
The bulb has a bit over 2800 hours, should I replace the bulb, or I should just use it as is?
Cheers to you, you're a master of DIY repairs!

Find out if that model has a 'replace lamp' warning on screen. Don't let that lamp inside the projector if it's dying, because there's a risk of explosion for dying lamps.

4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | JVC X30 (RS45)
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post #13 of 20 Old 05-09-2018, 12:15 PM
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Funny you say that, yesterday already blew up. Even the front glass cracked. I will need, a complete assembly now.
Though, I did not notice any warning on the screen. It showed, a bit over 2800 hours.

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post #14 of 20 Old 05-09-2018, 04:57 PM - Thread Starter
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Quote:
Originally Posted by tibimakai View Post
Funny you say that, yesterday already blew up. Even the front glass cracked. I will need, a complete assembly now.
Though, I did not notice any warning on the screen. It showed, a bit over 2800 hours.
Damn, that projector is cursed!

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post #15 of 20 Old 05-09-2018, 10:15 PM
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Actually I was mistaken, I have just assumed that it was the bulb, but after removing the bulb, I have realized, that the color wheel blew up. Maybe it was my mistake, at the assembly. There it was a black cardboard, that I may have placed it under the metal shield, and most likely it was touching the wheel itself.
I have already placed an order, for a new one.

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Wondering if you could help out with my issue. Epson 3020 powers on however it stops in the warm up mode with the blue light blinking and that’s it. No fan spinning and just stays in that mode. No lamp or overhear light. Just the blue light blinking and nothing else.
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post #17 of 20 Old 03-22-2020, 12:15 PM - Thread Starter
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Originally Posted by Rsicklescj7 View Post
Wondering if you could help out with my issue. Epson 3020 powers on however it stops in the warm up mode with the blue light blinking and that’s it. No fan spinning and just stays in that mode. No lamp or overhear light. Just the blue light blinking and nothing else.
Hello,

but, does it at least start the fans before reaching that blue light blinking mode?

Have you tried unplugging it completely for 10 minutes and plugging it again?

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post #18 of 20 Old 03-22-2020, 06:35 PM
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Fans don’t come on at all. I hit the power button and the light above it just blinks blue nothing else happens.
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post #19 of 20 Old 03-29-2020, 06:02 PM
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It could be to many things, that have failed. Any fans, ballast, power supply, bulb.
Since nothing turns on, I would suspect some voltage is missing, at the power supply. But it also could be, that the microcontroller chip, that controls everything may have failed.
If you look above, I have managed to fix a Benq W1070 and it was a Dc-Dc converter IC, and a shorted capacitor.
I also have a broken 3020, which has a bad HDMI board. I have also taken apart the main lens assembly, and I can't put it together correctly. I wanted to clean out dust blobs.

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post #20 of 20 Old 03-31-2020, 08:01 AM - Thread Starter
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Quote:
Originally Posted by Rsicklescj7 View Post
Fans don’t come on at all. I hit the power button and the light above it just blinks blue nothing else happens.
Yes, it could be many things, but I would rule out fans and temp. sensors, because the lack of on of those usually doesn't stop the projector from at least powering up. I created this thread but I'm not at all a technician, so I hope someone more capable might help you.

4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | JVC X30 (RS45)
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