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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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Onkyo TX-DS575 problem
The RAM i.c. on these is a known problem: They require resoldering to fix
intermittent / no audio problems. The solder pads at this chip are fragile - the slightest shearing motion while soldering can damage them. Mark Z. "Jiri Kuukasjärvi" wrote in message ... Hi! I have this malfunctioning Onkyo TX-DS575 home theater amplifier. There´s a problem with the DD processor board (quite large PCB, connected to the display pcb) As I connect signal to the amp, audio comes out ok. That´s if the processor board isn´t connected. If it´s connected, audio volume is very low even if I turn the master volume to the max. If I use the coaxial inputs.. No sound at all. The 3.3V regulator (NEC 29M33) seems to be ok. I already called the local service that has parts for this model. New board costs 74eur. So, any ideas on what might be wrong on the board or elsewhere in the amp? Do you have schematics for machine? TIA! - Jiri K. |
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Onkyo TX-DS575 problem
If it is more than the ram IC's that are defective, it will take some
very sophisticated test equipment, and very in debt knowledge of servicing your set. Also, you will require the proper soldering tools to simply change any of the parts. Usually when the fault requires sophisticated work, it may be more feasible to change the complete board. This is not something you can fix at home. If you mess in it, you may damage other parts, thus increasing the final cost of repairs. -- Greetings, Jerry Greenberg GLG Technologies GLG ============================================== WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ============================================== "Jiri Kuukasjärvi" wrote in message ... Hi! I have this malfunctioning Onkyo TX-DS575 home theater amplifier. There´s a problem with the DD processor board (quite large PCB, connected to the display pcb) As I connect signal to the amp, audio comes out ok. That´s if the processor board isn´t connected. If it´s connected, audio volume is very low even if I turn the master volume to the max. If I use the coaxial inputs.. No sound at all. The 3.3V regulator (NEC 29M33) seems to be ok. I already called the local service that has parts for this model. New board costs 74eur. So, any ideas on what might be wrong on the board or elsewhere in the amp? Do you have schematics for machine? TIA! - Jiri K. |
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Onkyo TX-DS575 problem
Jerry G. wrote:
If it is more than the ram IC's that are defective, it will take some very sophisticated test equipment, and very in debt knowledge of servicing your set. Also, you will require the proper soldering tools to simply change any of the parts. Usually when the fault requires sophisticated work, it may be more feasible to change the complete board. This is not something you can fix at home. If you mess in it, you may damage other parts, thus increasing the final cost of repairs. Yes, I thought so too. Too many special components. I bet if one of them was broken, and I somehow could have managed to find out, wich one.. No chance to get a replacement. Replacing SMD components isn´t a problem. But finding replacements.. I got the service manual & schematics.. But didn´t need them after all. Seems like it was only the solderings. I reflow the solderings of the IC´s (Memory & others too) in the DD card with hot air (Danotherm SMD soldering station) Now it works.. Thanks, Mark & Jerry. - Jiri K. |
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