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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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Simple Television Diagnosis
I have a ten year old 27 inch Mitsubishi television set that has developed a
problem, and I'm wondering if I can get a quick idea whether I should consider repair or replacement. Twice now in the last week the bottom right corner of the screen, less than a quadrant's worth, has turned purple-ish, and tonight, the upper right corner turned green as well. Can anyone tell me if this an obvious picture tube failure or perhaps something simpler? TIA - Magnusfarce |
#2
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Simple Television Diagnosis
"Magnusfarce" wrote in message nk.net... I have a ten year old 27 inch Mitsubishi television set that has developed a problem, and I'm wondering if I can get a quick idea whether I should consider repair or replacement. Twice now in the last week the bottom right corner of the screen, less than a quadrant's worth, has turned purple-ish, and tonight, the upper right corner turned green as well. Can anyone tell me if this an obvious picture tube failure or perhaps something simpler? TIA - Magnusfarce Do you have any speakers or other magnets nearby? If it is a problem within the TV set it's likely that the degaussing circuit has failed, this is pretty simple for any knowledgeable tech to repair, if the picture is otherwise decent it's worth fixing IMO, those older Mits sets are pretty good. |
#3
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Simple Television Diagnosis
"Magnusfarce" wrote in message ink.net...
I have a ten year old 27 inch Mitsubishi television set that has developed a problem, and I'm wondering if I can get a quick idea whether I should consider repair or replacement. Twice now in the last week the bottom right corner of the screen, less than a quadrant's worth, has turned purple-ish, and tonight, the upper right corner turned green as well. Can anyone tell me if this an obvious picture tube failure or perhaps something simpler? TIA - Magnusfarce Degauss problem, possibly the ptc resistor. Any magnets nearby? Also using only the remote to turn on/off does not activate degauss. |
#4
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Simple Television Diagnosis
"GPG" wrote in message om... Degauss problem, possibly the ptc resistor. Any magnets nearby? Also using only the remote to turn on/off does not activate degauss. --------------------- GPG: Using the remote to turn on/off the television certainly DOES activate the degauss cycle.... the power switch on the television is a momentary contact switch that wakes up the microprocessor just like the remote does..... it is not a mains disconnect switch like may be found on much older sets or some designs meant for the PAL/SECAM market. A waiting time or cool off period may be required for the degauss cycle to operate..... or as suggested, a magnet nearby or a malfunction with the degauss circuitry..... a rather inexpensive repair at most service shops. -- Best Regards, Daniel Sofie Electronics Supply & Repair. |
#5
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Simple Television Diagnosis
These degauss circuits will occasionally develop bad solder joints on the
thermistor, causing it to pulse, and put the spots on the screen. Resoldering and degaussing should cure the problem. |
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