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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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No remote control? Fixable?
My Philips DVDR, model DVDR3576H (160 GB), only 3 years old, stopped
responding to my remote. Replaced the batteries. No better. Used the universal remote that doesn't have all the commands, only on/off, numbers, play, stop, etc. No better. That remote still works fine with a tv it's also set up for. (Up for which it's also set.) Turned the DVDR off for hours, no better. (The remote has nothing to do with any logic circuits that can get confused, anyhow, right?) Moved the factory remote around 1/2 inch from the IR window and kept the 1 button down for a while and finally got a 1 to show in the channel display. Got a 5 the same way. Can't make an 11, and no other buttons work either. Could the problem be the thing behind the IR window, which I can probably buy or scavenge and already have one in my used-parts drawer too? Or is it more likely to be some small part on the circuit board? Is this fixable at a reasaonable price, or even under 100? Is it fixable by me, who used to fix a tvs fairly successfully before they went to IC's and propietary boards Thanks. Background: After 3 years, they are making no improvements to this model and there is no other model quite as good with a digital tuner and harddrive. I use only the harddrive 99% of the time. I don't foresee anything better for years to come, since they concentrate on cable and sat. customers. IS THERE SOMETHING NEW i DON'T KNOW ABOUT? (The other brand starts with M, iirc. Magnavox?) I paid 300 or a little more, and 20 refurbished previous models are on ebay new at $205! There's a used one, my model, on ebay at $76 with 4 more days to bid. I could buy one of these and when it breaks in a few years I might be able to use the IR sensor or the board it connects to to repair this current one. Deep, deep background, that is, unneeded info for the curious. There are a lot of flaws in the design of this, but this is still the best model for OTA, one of the 2 latest models I know of DVDRs with an ATSC tune and hard drive. But: It doesn't save the program name or description, only the time and channel and length that it was recorded. It doesn't let you look at the program info when you're recording the program. The live info display doesn't show what time the progrram starts or ends, like the set-top box I have does. If program scan includes channel 2.1, it must also include 2.2, 2.3 etc. If you set it to record for two hours, but you have a pre-set recording starting in the middle of that, the pre-set takes preference, unlike my good VCR. And lots of smaller things, all of which could be corrected I think with a firmware upgrade, but they only wrote one firmware upgrade for one big problem at the start, and no more. As to physical stores, these were only sold at Walmart, because everyone else has cable, I guess. (It does permit editing that I will never do.) There is even a still older model, broken, that he wants 120 inc s&h for parts!!! |
#2
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No remote control? Fixable?
On Wed, 29 Jun 2011 21:18:43 -0400, mm wrote:
My Philips DVDR, model DVDR3576H (160 GB), only 3 years old, stopped responding to my remote. Replaced the batteries. No better. Used the universal remote that doesn't have all the commands, only on/off, numbers, play, stop, etc. No better. That remote still works fine with a tv it's also set up for. (Up for which it's also set.) If you changed transmitters (remotes) and the problem stayed with the receiver (DVDR) then the problem is most likely with the DVDR, not the remotes. AFAIK, most IR receivers use pulses (of various encoding schemes) modulating a carrier of something near 38 KHz. If the receiver module has croaked, there are replacements. Lots of the receiver modules look like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1385-5-ND some like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2022-ND or http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-1994-ND While it's best to match the transmitter's carrier frequency with the center of the bandpass on the receiver, the receivers are generally fairly forgiving. That's why the "universal" remotes are effective, too. -- Rich Webb Norfolk, VA |
#3
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No remote control? Fixable?
On Wed, 29 Jun 2011 22:05:54 -0400, Rich Webb
wrote: On Wed, 29 Jun 2011 21:18:43 -0400, mm wrote: My Philips DVDR, model DVDR3576H (160 GB), only 3 years old, stopped responding to my remote. Replaced the batteries. No better. Used the universal remote that doesn't have all the commands, only on/off, numbers, play, stop, etc. No better. That remote still works fine with a tv it's also set up for. (Up for which it's also set.) If you changed transmitters (remotes) and the problem stayed with the receiver (DVDR) then the problem is most likely with the DVDR, not the remotes. AFAIK, most IR receivers use pulses (of various encoding schemes) modulating a carrier of something near 38 KHz. If the receiver module has croaked, there are replacements. Lots of the receiver modules look like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1385-5-ND some like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2022-ND or http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-1994-ND While it's best to match the transmitter's carrier frequency with the center of the bandpass on the receiver, the receivers are generally fairly forgiving. That's why the "universal" remotes are effective, too. Well, I can certainly replace this part. I hope that's it. Thanks. |
#4
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No remote control? Fixable?
On Thu, 30 Jun 2011 20:02:27 -0400, mm wrote:
On Wed, 29 Jun 2011 22:05:54 -0400, Rich Webb wrote: On Wed, 29 Jun 2011 21:18:43 -0400, mm wrote: My Philips DVDR, model DVDR3576H (160 GB), only 3 years old, stopped responding to my remote. Replaced the batteries. No better. Used the universal remote that doesn't have all the commands, only on/off, numbers, play, stop, etc. No better. That remote still works fine with a tv it's also set up for. (Up for which it's also set.) If you changed transmitters (remotes) and the problem stayed with the receiver (DVDR) then the problem is most likely with the DVDR, not the remotes. AFAIK, most IR receivers use pulses (of various encoding schemes) modulating a carrier of something near 38 KHz. If the receiver module has croaked, there are replacements. Lots of the receiver modules look like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=751-1385-5-ND some like http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-2022-ND or http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=425-1994-ND While it's best to match the transmitter's carrier frequency with the center of the bandpass on the receiver, the receivers are generally fairly forgiving. That's why the "universal" remotes are effective, too. Well, I can certainly replace this part. I hope that's it. Thanks. If you have access to a 'scope *and* can get to the legs of the receiver module, you may try probing it to see what kind of output you get. The ones I've seen have power, ground, and an open collector output that may or may not have an internal pull-up. -- Rich Webb Norfolk, VA |
#5
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No remote control? Fixable?
On Wed, 29 Jun 2011 21:18:43 -0400, mm put
finger to keyboard and composed: My Philips DVDR, model DVDR3576H (160 GB), only 3 years old, stopped responding to my remote. Moved the factory remote around 1/2 inch from the IR window and kept the 1 button down for a while and finally got a 1 to show in the channel display. Got a 5 the same way. Can't make an 11, and no other buttons work either. The uP inside the DVDR gets its user input from either the decoded IR stream or the buttons on the front panel. If one of the buttons were to stick, then that could produce the observed symptoms. Can you still control the DVDR from the front panel? Alternatively, have you checked for IR interference, such as from your lighting? Is there a cockroach in the IR window? :-) - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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