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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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Mitsubishi/Acer monitor not powering up fully.
G'day, I have a Mitsubishi 1570i monitor that powers to flashing yellow led only - graphics card had been ruled out. I was wondering if anyone had a schematic and/or circuit diagram for this or since it seems to be an acer clone (acer maindboard) the acer equivalent. Suggestions on where to look for problems would be gratefully received. I do not have an ESr meter or oscilloscope - but I do have a decent (brymen) auto ranging multimeter. Regards and thanks Ian |
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Mitsubishi/Acer monitor not powering up fully.
"Ian Dean" wrote in message ... G'day, I have a Mitsubishi 1570i monitor that powers to flashing yellow led only - graphics card had been ruled out. I was wondering if anyone had a schematic and/or circuit diagram for this or since it seems to be an acer clone (acer maindboard) the acer equivalent. Suggestions on where to look for problems would be gratefully received. I do not have an ESr meter or oscilloscope - but I do have a decent (brymen) auto ranging multimeter. Regards and thanks Ian Check the horizontal output transistor and soldering in that general area. Keep in mind that these often have an internal damping diode and resistor so they'll usually show a C-E short, but B-E and B-C junctions should test ok. |
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Mitsubishi/Acer monitor not powering up fully.
The most common causes of failure in these monitors are the horiz output
transistor, (HV drive transistor, if your monitor has a separate one), and switch driver transistor(s) in the power supply. The flyback and some of the caps in the power supply and horiz output section are sometimes the cause of the output transistors in both areas to fail. The horiz output transistor is difficult to properly test. I would replace it straight away, and test the switch drivers in the power supply. Then I would do a complete ESR test on all the caps in the power supply, horiz scan, HV gen, and the vertical deflection areas. After all the testing is done, and the mentioned devices have been properly tested, and the suspect ones replaced, I would then only apply the power back. If something is still not correct, the new parts will most likely blow instantly on the power up. Therefore, proper testing and evaluation is important. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Ian Dean" wrote in message ... G'day, I have a Mitsubishi 1570i monitor that powers to flashing yellow led only - graphics card had been ruled out. I was wondering if anyone had a schematic and/or circuit diagram for this or since it seems to be an acer clone (acer maindboard) the acer equivalent. Suggestions on where to look for problems would be gratefully received. I do not have an ESr meter or oscilloscope - but I do have a decent (brymen) auto ranging multimeter. Regards and thanks Ian |
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