Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Sony TV troubles and Discharging CRT (with Pictures)
Hi,
Obviously, any advice you do give is at my own risk, and you will not be held responsible for any accidents that could occur. To give you an idea what level of understanding I have, I'll give you some background. This is the first time I've taken the back of a TV. I've previously successfully fixed washing machine electrics, I'm a qualified car mechanic so I've dealt with LT and HT problems + radios, electrical systems etc and I've got a Physics A level. So, on with the problem: We were watching TV (Sony KV32FX U) yesterday (Lost, what a silly ending that was) and everything was fine, good picture etc, when suddenly, the TV clicked loudly and the picture disappeared. Now, if I push the power button to on, the standby button lights correctly. If I then press a channel button to actually try and show as channel, the TV clicks (it made this sound when it worked correctly), but no picture or sound come and the standby light flashes 4 times. I've taken the back off, and checked the one fuse I could see (ok). Any thoughts on what the problem could be? In addition, regarding safety: I've used the following procedure to attempt discharge the CRT (power disconnected) "Either purchase a shorting probe or make one. If this is not an option, use two well-insulated screwdrivers. If using a probe, connect the wire and clip to the metal chassis surrounding the CRT. If using screwdrivers, place the end on one screwdriver on the metal chassis surrounding the front of the tube. NOTE: Make absolutely sure that you are not touching any metal parts during the next steps. If using screwdrivers, slip the end of the other screwdriver under the protective rubber grommet on the side of the CRT, where the high- voltage wire is attached to the tube. Note: When you discharge the tube, there may be a very bright flash and a loud snapping noise. Try not to look at the point where the flash will appear. Also, be aware of the snapping noise, as it may cause you to jump. Now, either slip the end of the shorting probe under the rubber grommet or cross the two screwdrivers together to create a path for the electricity to arc across. Remove the screwdrivers or probe." I attempted perhaps 10 times, ensuring I got the screwdrivers on the metal. When I did it, there was no noise, spark or flash. Does this sound reasonable? I've taken pictures of me doing this which you can see he http://www.wmathias.0catch.com. There's also some other pictures of the TV for reference. Any help would be much appreciated, Will |
#2
Posted to sci.electronics.repair
|
|||
|
|||
Sony TV troubles and Discharging CRT (with Pictures)
Also, can recommended reading on the subject would be very helpful
|
#3
Posted to sci.electronics.repair
|
|||
|
|||
Sony TV troubles and Discharging CRT (with Pictures)
On 30 May, 13:35, Will wrote:
Hi, Obviously, any advice you do give is at my own risk, and you will not be held responsible for any accidents that could occur. To give you an idea what level of understanding I have, I'll give you some background. This is the first time I've taken the back of a TV. I've previously successfully fixed washing machine electrics, I'm a qualified car mechanic so I've dealt with LT and HT problems + radios, electrical systems etc and I've got a Physics A level. So, on with the problem: We were watching TV (Sony KV32FX U) yesterday (Lost, what a silly ending that was) and everything was fine, good picture etc, when suddenly, the TV clicked loudly and the picture disappeared. Now, if I push the power button to on, the standby button lights correctly. If I then press a channel button to actually try and show as channel, the TV clicks (it made this sound when it worked correctly), but no picture or sound come and the standby light flashes 4 times. I've taken the back off, and checked the one fuse I could see (ok). Any thoughts on what the problem could be? In addition, regarding safety: I've used the following procedure to attempt discharge the CRT (power disconnected) "Either purchase a shorting probe or make one. If this is not an option, use two well-insulated screwdrivers. If using a probe, connect the wire and clip to the metal chassis surrounding the CRT. If using screwdrivers, place the end on one screwdriver on the metal chassis surrounding the front of the tube. NOTE: Make absolutely sure that you are not touching any metal parts during the next steps. If using screwdrivers, slip the end of the other screwdriver under the protective rubber grommet on the side of the CRT, where the high- voltage wire is attached to the tube. Note: When you discharge the tube, there may be a very bright flash and a loud snapping noise. Try not to look at the point where the flash will appear. Also, be aware of the snapping noise, as it may cause you to jump. Now, either slip the end of the shorting probe under the rubber grommet or cross the two screwdrivers together to create a path for the electricity to arc across. Remove the screwdrivers or probe." I attempted perhaps 10 times, ensuring I got the screwdrivers on the metal. When I did it, there was no noise, spark or flash. Does this sound reasonable? I've taken pictures of me doing this which you can see he http://www.wmathias.0catch.com. There's also some other pictures of the TV for reference. Any help would be much appreciated, Will usually horiz output or psu. Can be many things though. You'd need electronics skills to do it. NT |
#4
Posted to sci.electronics.repair
|
|||
|
|||
Sony TV troubles and Discharging CRT (with Pictures)
No comment on the physics and automotive ability but you may be far wiser to
relegate this device to the professionals who are specifically trained in their repair of Sony Specific Products. It may be far safer and less expensive in the long run for you. Also the specific devices you will need for repair willl probably need to come from SONY or their parts depot. Cheers wrote in message oups.com... On 30 May, 13:35, Will wrote: Hi, Obviously, any advice you do give is at my own risk, and you will not be held responsible for any accidents that could occur. To give you an idea what level of understanding I have, I'll give you some background. This is the first time I've taken the back of a TV. I've previously successfully fixed washing machine electrics, I'm a qualified car mechanic so I've dealt with LT and HT problems + radios, electrical systems etc and I've got a Physics A level. So, on with the problem: We were watching TV (Sony KV32FX U) yesterday (Lost, what a silly ending that was) and everything was fine, good picture etc, when suddenly, the TV clicked loudly and the picture disappeared. Now, if I push the power button to on, the standby button lights correctly. If I then press a channel button to actually try and show as channel, the TV clicks (it made this sound when it worked correctly), but no picture or sound come and the standby light flashes 4 times. I've taken the back off, and checked the one fuse I could see (ok). Any thoughts on what the problem could be? In addition, regarding safety: I've used the following procedure to attempt discharge the CRT (power disconnected) "Either purchase a shorting probe or make one. If this is not an option, use two well-insulated screwdrivers. If using a probe, connect the wire and clip to the metal chassis surrounding the CRT. If using screwdrivers, place the end on one screwdriver on the metal chassis surrounding the front of the tube. NOTE: Make absolutely sure that you are not touching any metal parts during the next steps. If using screwdrivers, slip the end of the other screwdriver under the protective rubber grommet on the side of the CRT, where the high- voltage wire is attached to the tube. Note: When you discharge the tube, there may be a very bright flash and a loud snapping noise. Try not to look at the point where the flash will appear. Also, be aware of the snapping noise, as it may cause you to jump. Now, either slip the end of the shorting probe under the rubber grommet or cross the two screwdrivers together to create a path for the electricity to arc across. Remove the screwdrivers or probe." I attempted perhaps 10 times, ensuring I got the screwdrivers on the metal. When I did it, there was no noise, spark or flash. Does this sound reasonable? I've taken pictures of me doing this which you can see he http://www.wmathias.0catch.com. There's also some other pictures of the TV for reference. Any help would be much appreciated, Will usually horiz output or psu. Can be many things though. You'd need electronics skills to do it. NT |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Sony Replacement CRT Wanted | Electronics Repair | |||
Sony proj CRT | Electronics Repair | |||
Sony KV27S15 weak CRT | Electronics Repair | |||
Sony 60" CRT projection - needs repair | Electronics Repair | |||
Convergence CRT Sony G400-D | Electronics Repair |