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
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
The symptom you are describing is indicative of cold solder joints. If you
have proper soldering tools, and experience,you should be able to complete the repair, if not, i'd advise that you take you take your receiver to a repair shop, where you can at least get an estimate. Which most shops offer for free. Dan "Bernhard" wrote in message ... My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. I already opened the case and tried to force a shutdown by knocking on all boards, connectors, switches and everything inside. I could not find any connection with my actions and the intermittend shutdowns. Before I buy the service manual and disassemble the unit, I would like to ask, if anyone else had this error and could help me. Thank you very much. Bernhard (backs*mailandnews.com) |
#2
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
My Yamaha RX-V795 receiver shows a strange behaviour.
After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. I already opened the case and tried to force a shutdown by knocking on all boards, connectors, switches and everything inside. I could not find any connection with my actions and the intermittend shutdowns. Before I buy the service manual and disassemble the unit, I would like to ask, if anyone else had this error and could help me. Thank you very much. Bernhard (backs*mailandnews.com) |
#3
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
"Sofie" wrote in message ... snipped: "Bernhard" wrote in message My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. Bernhard I'd first check to be sure that you don't have any shorted strands on speaker wires, --------------------------------------------- Bernhard: Regarding the symptoms you described, "buying the service manual and disassembling the unit" is not going to fix the problem nor will the service manual offer you specific suggestions and procedures for repair.... the service manual is only most useful to knowledgeable and experienced technicians who probably can fix the equipment without the manual.. What you described is most likely, as the previous reply post by "Dan" correctly stated, caused by faulty solder connections and/or possibly intermittent connectors. This is a routine repair at most service shops that most likely does NOT require the hard to get and expensive service manual. Service manuals for Yamaha receivers are easy to get (from Yamaha) and relatively inexpensive at $18 retail, $12 dealer cost. It can be useless to someone who is inexperienced in these units, as stated previsously and perhaps not needed for this repair. As "Dan" suggested, at the very least take it to a service shop for a repair cost estimate..... so you can make an intelligent repair decision with facts instead of guesses. If you take it to the shop AFTER aborted or failed home repair attempts, or after continuing to operate the unit with this problem until it gets worse to the point it won't work at all, the repair shop price will certainly be much higher. Good advice. Leonard Caillouet |
#4
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
snipped:
"Bernhard" wrote in message My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. Bernhard --------------------------------------------- Bernhard: Regarding the symptoms you described, "buying the service manual and disassembling the unit" is not going to fix the problem nor will the service manual offer you specific suggestions and procedures for repair.... the service manual is only most useful to knowledgeable and experienced technicians who probably can fix the equipment without the manual.. What you described is most likely, as the previous reply post by "Dan" correctly stated, caused by faulty solder connections and/or possibly intermittent connectors. This is a routine repair at most service shops that most likely does NOT require the hard to get and expensive service manual. As "Dan" suggested, at the very least take it to a service shop for a repair cost estimate..... so you can make an intelligent repair decision with facts instead of guesses. If you take it to the shop AFTER aborted or failed home repair attempts, or after continuing to operate the unit with this problem until it gets worse to the point it won't work at all, the repair shop price will certainly be much higher. -- Best Regards, Daniel Sofie Electronics Supply & Repair ----------------------------- |
#5
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
Thanks Dan.
Good idea. I'm an experienced electronics hobbyist and have the proper soldering tools and I should have known that... I will disassemble the board where the power switch together with the microcontroller is located and inspect it. Maybe there is a cold solder joint that worked for the first 3 years and is now getting worse by the permanent mechanical stress of pushing the power switch. If anyone else has experienced the same error, please post your solution. Bernhard (backs*mailandnews.com) Dan wrote: The symptom you are describing is indicative of cold solder joints. If you have proper soldering tools, and experience,you should be able to complete the repair, if not, i'd advise that you take you take your receiver to a repair shop, where you can at least get an estimate. Which most shops offer for free. Dan "Bernhard" wrote in message ... My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. I already opened the case and tried to force a shutdown by knocking on all boards, connectors, switches and everything inside. I could not find any connection with my actions and the intermittend shutdowns. Before I buy the service manual and disassemble the unit, I would like to ask, if anyone else had this error and could help me. Thank you very much. Bernhard (backs*mailandnews.com) |
#6
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
Daniel,
Thanks for your suggestions. I know what a service manual contains and I'm experienced enough to not trying to repair my receiver to death. I mentioned to buy the service manual because the device is filled up with so much boards that it was difficult to tell their exact function (and after some years I usually need the manual for some other repairs). Another point is the qualification of service personnel in repair shops here in Germany. Almost all of them work on a "pay-per-module" base: Let's first exchange the module or PCB that makes up the control panel with the power switch (ups.. thats about $100.-) next let's try the power supply (another $130.-) and so on. The price for a repair cost estimate is around $50.- if you don't actually let the device be repaired in that shop. And my personal experience is that most repair cases have been really small things like a burned diode or a dead electrolytic capacitor and could be fixed for a buck or so (not taking into account the time I need to locate the error, but I don't have to pay for it). I think, Dan and you are right with your guess and I will try to find the faulty solder joint. Bernhard (backs*mailandnews.com) Sofie wrote: snipped: "Bernhard" wrote in message My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. Bernhard --------------------------------------------- Bernhard: Regarding the symptoms you described, "buying the service manual and disassembling the unit" is not going to fix the problem nor will the service manual offer you specific suggestions and procedures for repair.... the service manual is only most useful to knowledgeable and experienced technicians who probably can fix the equipment without the manual.. What you described is most likely, as the previous reply post by "Dan" correctly stated, caused by faulty solder connections and/or possibly intermittent connectors. This is a routine repair at most service shops that most likely does NOT require the hard to get and expensive service manual. As "Dan" suggested, at the very least take it to a service shop for a repair cost estimate..... so you can make an intelligent repair decision with facts instead of guesses. If you take it to the shop AFTER aborted or failed home repair attempts, or after continuing to operate the unit with this problem until it gets worse to the point it won't work at all, the repair shop price will certainly be much higher. -- Best Regards, Daniel Sofie Electronics Supply & Repair ----------------------------- |
#7
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
Work on these all the time possible loose ground screws on input jack assy or
broken ground connection in same area. Also bad sorder connections on sram chip near main processor {very small connections must be very good at soldering!! Steve N.J. Bernhard wrote: Daniel, Thanks for your suggestions. I know what a service manual contains and I'm experienced enough to not trying to repair my receiver to death. I mentioned to buy the service manual because the device is filled up with so much boards that it was difficult to tell their exact function (and after some years I usually need the manual for some other repairs). Another point is the qualification of service personnel in repair shops here in Germany. Almost all of them work on a "pay-per-module" base: Let's first exchange the module or PCB that makes up the control panel with the power switch (ups.. thats about $100.-) next let's try the power supply (another $130.-) and so on. The price for a repair cost estimate is around $50.- if you don't actually let the device be repaired in that shop. And my personal experience is that most repair cases have been really small things like a burned diode or a dead electrolytic capacitor and could be fixed for a buck or so (not taking into account the time I need to locate the error, but I don't have to pay for it). I think, Dan and you are right with your guess and I will try to find the faulty solder joint. Bernhard (backs*mailandnews.com) Sofie wrote: snipped: "Bernhard" wrote in message My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. Bernhard --------------------------------------------- Bernhard: Regarding the symptoms you described, "buying the service manual and disassembling the unit" is not going to fix the problem nor will the service manual offer you specific suggestions and procedures for repair.... the service manual is only most useful to knowledgeable and experienced technicians who probably can fix the equipment without the manual.. What you described is most likely, as the previous reply post by "Dan" correctly stated, caused by faulty solder connections and/or possibly intermittent connectors. This is a routine repair at most service shops that most likely does NOT require the hard to get and expensive service manual. As "Dan" suggested, at the very least take it to a service shop for a repair cost estimate..... so you can make an intelligent repair decision with facts instead of guesses. If you take it to the shop AFTER aborted or failed home repair attempts, or after continuing to operate the unit with this problem until it gets worse to the point it won't work at all, the repair shop price will certainly be much higher. -- Best Regards, Daniel Sofie Electronics Supply & Repair ----------------------------- |
#8
|
|||
|
|||
Yamaha RX-V795 receiver shuts itself down after some time
I am less inclined toward the solder connections, since Yamaha's are a bit
less prone to this. If it were solder connections, I would look closely at the solder at the bias transistors - this is the only place I've seen this on later Yamaha's. I'm leaning much more towards the speaker wiring, a loose strand crossing over etc. Mark Z. "Dan" wrote in message ... The symptom you are describing is indicative of cold solder joints. If you have proper soldering tools, and experience,you should be able to complete the repair, if not, i'd advise that you take you take your receiver to a repair shop, where you can at least get an estimate. Which most shops offer for free. Dan "Bernhard" wrote in message ... My Yamaha RX-V795 receiver shows a strange behaviour. After switching the device on, it shuts down immediately or after some seconds or after a longer period of time, sometimes after 1 or 2 hours. This often happens when I inadvertently bump against the rack on which the receiver is located - but it also happens when absolutely no mechanical vibrations are present. I already opened the case and tried to force a shutdown by knocking on all boards, connectors, switches and everything inside. I could not find any connection with my actions and the intermittend shutdowns. Before I buy the service manual and disassemble the unit, I would like to ask, if anyone else had this error and could help me. Thank you very much. Bernhard (backs*mailandnews.com) |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
OT - $87 Billion Moore | Metalworking | |||
OT-John Kerry | Metalworking | |||
Making a ruin into something habitable. | UK diy |