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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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I recently acquired two Toshiba DVD units; model SD-1700U that are
experiencing very distorted audio. I have followed several postings regarding some of these players with bad or no audio, but I am still uncertain what needs to be replaced, component-wise. Is the problem on the PC-Main card or the Pwr-Sub assy board? Any would be very appreciated. Pat |
#2
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Ooh! My ears burned.
Actually, I'm not the one with experience on these, but I've seen lots of posts on these Toshiba's and I've tried to re-post info I've found. I'll be right back with the info. Mark Z. "Bill Bolle" wrote in message ... Patrick Tinney wrote: I recently acquired two Toshiba DVD units; model SD-1700U that are experiencing very distorted audio. I have followed several postings regarding some of these players with bad or no audio, but I am still uncertain what needs to be replaced, component-wise. Is the problem on the PC-Main card or the Pwr-Sub assy board? Any would be very appreciated. Pat The biggest problem with this model is the caps on the "main" board. If you have a capacitor checker check all the caps on that board but if the only thing you have is an ohmmeter than use that. The schematic is very hard to come by as it's only available on a $50 CD from Toshiba. Also, you might try to "ping" Mark Zacharias, he is familiar with the problem. Bill |
#3
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Well, this is all I could find on my computer. There'd be more using Google.
"Toshiba had a problem with the SD1700, SD1750, and SD2700 models. Q801 (PN# 79050088) would short blowing F801 (PN# 79087008). The fix for it was to replace Q801 and F801. Also replace D808 a 30 volt zener diode with a 6.8 volt zener at .5 watt (PN# 79060029). Next add a 56k ohm .25 watt -/+ 2% carbon film resistor between the gate and ground of Q801. Check the value of R808 as well. Sorry the value was not in the bulletin. WM " ************************************************** ***** And here's one on the audio problem, don't know the author. *********************************************** "This is the second failure for this unit. Based on various posts, this is a problem for several Toshiba models (the one here is the SD-400V). The negative supply to the audio opamp disappears. The first failure was a bypass capacitor on pin 4 of the opamp. The second failure was a bypass capacitor on the base of the switching transistor that controls the negative supply to the audio opamp. Both capacitors are 16V, 100 uF and are marked SMG (Samsung?). There are a lot of these capacitors in this player. I think I'll trash it the next time it fails. Had the same situation with a Sony camcorder ... multiple failures of electrolytic capacitors." ************************************************** **** Mark Z. "Mark D. Zacharias" wrote in message nk.net... Ooh! My ears burned. Actually, I'm not the one with experience on these, but I've seen lots of posts on these Toshiba's and I've tried to re-post info I've found. I'll be right back with the info. Mark Z. "Bill Bolle" wrote in message ... Patrick Tinney wrote: I recently acquired two Toshiba DVD units; model SD-1700U that are experiencing very distorted audio. I have followed several postings regarding some of these players with bad or no audio, but I am still uncertain what needs to be replaced, component-wise. Is the problem on the PC-Main card or the Pwr-Sub assy board? Any would be very appreciated. Pat The biggest problem with this model is the caps on the "main" board. If you have a capacitor checker check all the caps on that board but if the only thing you have is an ohmmeter than use that. The schematic is very hard to come by as it's only available on a $50 CD from Toshiba. Also, you might try to "ping" Mark Zacharias, he is familiar with the problem. Bill |
#4
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Mark D. Zacharias wrote:
Ooh! My ears burned. Actually, I'm not the one with experience on these, but I've seen lots of posts on these Toshiba's and I've tried to re-post info I've found. I'll be right back with the info. Mark Z. "Bill Bolle" wrote in message ... Patrick Tinney wrote: I recently acquired two Toshiba DVD units; model SD-1700U that are experiencing very distorted audio. I have followed several postings regarding some of these players with bad or no audio, but I am still uncertain what needs to be replaced, component-wise. Is the problem on the PC-Main card or the Pwr-Sub assy board? Any would be very appreciated. Pat The biggest problem with this model is the caps on the "main" board. If you have a capacitor checker check all the caps on that board but if the only thing you have is an ohmmeter than use that. The schematic is very hard to come by as it's only available on a $50 CD from Toshiba. Also, you might try to "ping" Mark Zacharias, he is familiar with the problem. Bill Sorry!!!! I had a problem with my unit quite some time ago but lost the correspondence that I had with the person that helped me out. I really thought that it was you. Sorry for puting you on the spot. Bill |
#5
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I recently acquired two Toshiba DVD units; model SD-1700U that are
experiencing very distorted audio. Replace capacitors C926, C927, C928, and C929 on the main media board. The caps are located near the connector which links the media board to the power supply. They will be rated at 100 microfarads at 16 volts and are polarized. Use caps rated at 100 microfarads with a voltage tolerance that is at least 25 volts. You can go with a higher voltage rated cap, but make sure that the cap won't be too big to properly fit it in place. Observe correct polarity when installing the new caps. - Reinhart |
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