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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Epson ELP 7200 Projector Power Supply Help
Hello, all.
I have recently acquired an Epson ELP 7200 LCD Projector with a bad power supply. I had it assessed at an authorized repair shop and they just said the power supply was bad.. and estimated $300+ for parts (the PS) and $250 for labour to fix it. I've pulled the unit apart and inspected the power supply and I can't seem to find anything visually wrong with it. I've tested with a Voltmeter where the power supply provides power to the main circuit board and some of the lines have what seems to be reasonable voltage (others do not.. but I'm no expert). I got a hold of the Service Manual thinking/hoping it would provide enough details for me to properly assess myself what is broken.. but no such luck. The service manual was next to useless.. only providing information on how to coomunicate through the serial port with a correctly working projector. No help on troubleshooting a currently defective one. I've been trying to find information on possibly how to fix a power supply but mostly find advice to not even try because of the potentially lethal voltage stored up. Another thought was that I could just swap out the power supply with another one and not worry about aesthetics or mobility. It is difficult to figure if this is possible since I don't know what the correct voltages are for a correctly working unit. What do people think? Is this a lost cause? Is there anything obvious I can check out? I've only gone to an 'authorized' Epson repair shop so far.. would I have better success going somewhere that would actually try to repair the current power supply rather than just throwing it out for a new one? The chance that I could have a working LCD projector and watch my movies 10 feet wide on the wall is hard to ignore. I've been a little obsessive about this thing lately. Thanks, Any help appreciated. Dylan |
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Epson ELP 7200 Projector Power Supply Help
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Epson ELP 7200 Projector Power Supply Help
Hmm. Combined into the power supply is a separate component that provides power to the lamp. It has a box mounted on the IC with two serious wires coming out of it.. and on the box itself it has a warning and a 25kV output label. Also on the main part of the PS itself is (what I believe to be) a capacitor that is about an inch thich and 2 inches long. I haven't investigated to see any numbers on the side yet.. but I was wary. This is probably the primary side filter cap, something of fewhunderd-uf's and 400V+ size. No low volts actually... Are you sure this is a low voltage device? He isn't obviously sure about what he's writing... It may well be worth fixing if you have the time. It could be a bad regulator or transformer winding. Check the AC voltages at the all the secondary points of the power supply transformer. It may only have one ....it would be quite hard to simply "check the voltages" of a switch mode power supply. |
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Epson ELP 7200 Projector Power Supply Help
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Epson ELP 7200 Projector Power Supply Help
The power supply is also the ignitor and ballast for the lamp. The ignition
voltage can be upward of 20KV or more but that's only to ignite the lamp. Unfortunately with these supplies, it's usually the ignitor that is the problem. On this unit, I believe it's that little black or white box made by Philips. Forget about getting it unless it's salvaged. The part was made specifically for Epson. If you're getting your basic supply voltages to the digital circuits (5V, 12V, etc.) then chances are it's the ignitor that's bad. -Chris "Dylan" wrote in message m... (Kyle Miller) wrote in message om... Don't worry about lethal voltages, those are low voltage devices. Hmm. Combined into the power supply is a separate component that provides power to the lamp. It has a box mounted on the IC with two serious wires coming out of it.. and on the box itself it has a warning and a 25kV output label. Also on the main part of the PS itself is (what I believe to be) a capacitor that is about an inch thich and 2 inches long. I haven't investigated to see any numbers on the side yet.. but I was wary. Are you sure this is a low voltage device? It may well be worth fixing if you have the time. It could be a bad regulator or transformer winding. Check the AC voltages at the all the secondary points of the power supply transformer. It may only have one voltage line problem that could be repaired or hacked. If you need to determine the correct voltage for a suspicious voltage reading, then check the datasheets on the ic's that use the voltage further down the circuit path. Alright, thanks for the info Kyle. I'm going to read up more on power supplies so that I can hopefully figure out where the regulator and transformers are on my device. Thanks, Dylan |
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Epson ELP 7200 Projector Power Supply Help
The power supply is also the ignitor and ballast for the lamp. The ignition
voltage can be upward of 20KV or more but that's only to ignite the lamp. Unfortunately with these supplies, it's usually the ignitor that is the problem. On this unit, I believe it's that little black or white box made by Philips. Forget about getting it unless it's salvaged. The part was made specifically for Epson. If you're getting your basic supply voltages to the digital circuits (5V, 12V, etc.) then chances are it's the ignitor that's bad. -Chris "Dylan" wrote in message m... (Kyle Miller) wrote in message om... Don't worry about lethal voltages, those are low voltage devices. Hmm. Combined into the power supply is a separate component that provides power to the lamp. It has a box mounted on the IC with two serious wires coming out of it.. and on the box itself it has a warning and a 25kV output label. Also on the main part of the PS itself is (what I believe to be) a capacitor that is about an inch thich and 2 inches long. I haven't investigated to see any numbers on the side yet.. but I was wary. Are you sure this is a low voltage device? It may well be worth fixing if you have the time. It could be a bad regulator or transformer winding. Check the AC voltages at the all the secondary points of the power supply transformer. It may only have one voltage line problem that could be repaired or hacked. If you need to determine the correct voltage for a suspicious voltage reading, then check the datasheets on the ic's that use the voltage further down the circuit path. Alright, thanks for the info Kyle. I'm going to read up more on power supplies so that I can hopefully figure out where the regulator and transformers are on my device. Thanks, Dylan |
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