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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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#1
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Hitachi 27CX5B Power Down
If anyone would be so kind as to lend a hand. I have a Hitachi 27CX5B that
randomly powers down. The set will not restart for 30 to 40 mins after power off. Any Ideas? |
#2
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If anyone would be so kind as to lend a hand. I have a Hitachi 27CX5B
that randomly powers down. The set will not restart for 30 to 40 mins after power off. First (and easiest) thing to check would be the power source the device is connected to. Is the power good? Sufficient mains voltage? Any strange transients, if on a circuit with lots of other electronics such as CRTs, printers, etc? -- Jem Berkes http://www.sysdesign.ca/ |
#3
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Thanks Jem. The power supply is good. This problem happened first at a
different location and now at my house. The screen collapses to a thin vertical line for a second then the unit powers off. Real curious. Had a service person look at the set but he could find no problem. Any further suggestions? |
#4
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"biermike" wrote in message alkaboutelectronicequipment.com...
If anyone would be so kind as to lend a hand. I have a Hitachi 27CX5B that randomly powers down. The set will not restart for 30 to 40 mins after power off. Any Ideas? Dollars to donuts you got bad solder connections and/or dry caps in powersupply |
#5
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Try soldering the vertical IC, & check the electrolytic
capacitors around the IC. This may be why it shuts down! Check soldering in the power supply also! Rono. "biermike" wrote in message lkaboutelectronicequipment ..com... If anyone would be so kind as to lend a hand. I have a Hitachi 27CX5B that randomly powers down. The set will not restart for 30 to 40 mins after power off. Any Ideas? |
#6
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First and foremost, apply the service bulletin to the ABL shutdown
circuit. Involves adding a .47uf capacitor somewhere. Look at Hitachi's service site to all the details. Then if that doesn't do it, time to hook up your multi-channel DSO to critical test points to monitor what is happening when the tv shutsdown. This is assuming standard tv troubleshooting does not turn up anything on the edge of a problem. David "biermike" wrote in message alkaboutelectronicequipment.com... If anyone would be so kind as to lend a hand. I have a Hitachi 27CX5B that randomly powers down. The set will not restart for 30 to 40 mins after power off. Any Ideas? |
#7
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On Sun, 24 Oct 2004 19:03:00 -0400, "biermike" wrote:
Thanks Jem. The power supply is good. This problem happened first at a different location and now at my house. The screen collapses to a thin vertical line for a second then the unit powers off. Real curious. Had a service person look at the set but he could find no problem. Any further suggestions? Vertical as in top-to-bottom? If so, you have a bad connection/component in the horizontal deflection circuit. Tom |
#8
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The cap of the HOT burns up on these.
kip |
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