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Fixing EPSON EB-W130 that doesn't turn on (and no LEDs light).

Hi,

I’m in the process of fixing my Epson EB-W130 projector.

The projector doesn’t turn on or show any indication of powering up (power buttons do nothing and no LEDs light up when power is applied).

I’ve been trying to locate the service manual for it. (Note this is different to the user manual).

So far google searches have only returned the user manual.

Does someone know where I can find it? Or perhaps point me in the right direction to obtain it please?

Cheers,

James

Update (20-Aug-2018)

Currently my investigations point to the main power supply (main PSU).

I’ve found:

  • 2 fuses - all intact still.
  • 1 thermal fuse - which is operating correctly.
  • 240V AC (Australian mains) is measured on the main PSU board successfully.
  • Probing the main PSU shows that it’s output to the processor PCB is 0V DC (expecting 17V DC according to the silkscreen on the main PSU board). I’ve even hooked up the oscilloscope to see what the main PSU does when power is applied. Nothing, there’s a small flinch in the voltage level but nothing to really indicate that the power supply powered up and had it’s output disabled by the processor board. There’s not even any activity on the optocouplers that pass control signals from the processor board to the primary side of the main PSU.
  • Disconnected the main PSU from the processor board. I read 10 V DC on the output (expecting 17V DC according to the silkscreen). The oscilloscope shows a very clean 10 V DC signal.
  • I try connecting the power supply to the processor board again, this time with the optocoupler signals disconnected to make sure there’s no ‘kill’ signal being sent to the main PSU. Power on, and the supply’s output measures in at 0 VDC again.

Perhaps the main PSU is not working properly (indicated by 10VDC being measured instead of 17VDC). It could therefore be struggling to source enough power for the processor board to boot up?

I’ve started reverse engineering the power supply a little to double check that the PSU IC, transistors and other components are working/biased correctly. (This is where I was hoping for a service manual to help me along). Nonetheless I will continue investigating.

At this stage I’m not sure if I can trust the 17V DC marked on the main PSU’s silkscreen. I have thought of powering the processor board using my bench PSU - I just don’t want to risk damaging the processor board until I’ve investigated the input range it can handle. I see switching regulators, so perhaps it has some tolerance to input voltage. My thought is - if it powers up from the bench supply and provides some activity on the status LED’s then that’ll add evidence to the problem existing at the main PSU.

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I have the H729A/VS240... no LED for power or any other indication of power. Plug is good. 120v to and thru the power board. Any help on checks past that point would be helpful.

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My Epson HC2150 just shut off mid watching… it also has no lights etc. I unfortunately do not have your experience so not sure if I'm S.O.L.

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Update (9-Sep-2018)

Finally managed to spend some time on this project this past weekend. The projector is diagnosed and fixed!! Turns out there was a short circuit on the processor board.

This was causing the short circuit protection of the PSU to activate and disable its output (ie setting its output to 0 VDC). This answers dot points 4 and 6 above.

I also worked out that because of the short, the optocoupler responsible for enabling the power supply output wasn’t being turned on. This meant the PSU sat at 10 VDC as in dot point 5. When I manually pulled the optocoupler high the PSU went into full swing and output the 17 VDC correctly. I also successfully loaded it to 1.5A (PSU cable of 3A) without a glitch. After checking the power MOSFETs, voltage references for feedback, and the PWM & power factor correction controllers they all checked out, and gave signals that I was expecting/calculated. So this told me the main PSU is all good.

Back to the processor board, tracing down a short circuit can be painful. However, thankfully I was able to isolate it quickly to the local power supplies on the processor board. Narrowing down further I managed to find that it was one ceramic decoupling capacitor one of the local power supplies. I am quite surprised that it failed, In my experience, these things rarely fail unless mechanically stress (ie dropping the board/projector). I’ve replaced it and now everything is back up and running. Yaay!

Picture of bad cap for the amusement of anyone reading.

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Hi @jameske ,

Well done!

Just wondering if the original capacitor had the correct voltage rating and perhaps was operating at the upper end of its rating and eventually became overstressed and failed.

Just a thought.

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Thanks mate, and fair call about the voltage rating. I was too wondering about that and also the level of reliability in a reel of ceramic caps. Perhaps it's not all it's cracked up to be (pun intended). Jokes aside, that's a good thought, thanks.

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Well done that capacitor was 0805 16v 10uf?

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I have a similar problem, and I am lost how you fixed it. I am not experienced but I can follow directions. Anyone can help?

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Nice job there! How did you find the value of the bad smd capacitor? I found 5 of this bad caps in short circuit on the processor board. 4 of them are in pairs so maybe only some of them are bad. I'm in the process of taking them off the board for further investigation but without a repair manual I might be stuck at this phase or just guessing their values based on other caps values on the board. Any help would be great.

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If there are multiple capacitors in parallel, you can remove one or two without replacing them.

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James Ke zal eeuwig dankbaar zijn.
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