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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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TV stopped responding after RCA universal remote
I posted about this earlier (Hitachi CT7883) with the original Video Brain
Remote Transmitter CLU-600PR which broke down over time. The Hitachi VCR remote control, however, could still control the television perfectly! But * after * trying an RCA universal remote, the television stopped responding entirely to even the good remote control. Now I have obtained a factory remote replacement as per Hitachi's tech support and even this can not control the television set. The TV stopped responding to remote controls. I'm quite certain that the programming efforts of the universal remote put the TV into a bad state. If I can clear the nonvolatile memory somehow, this should fix things. But even leaving the TV unplugged had no success. Any ideas? Is there anything else I can do, short of calling in a repair person to look at a 13 year old TV set? -- Jem Berkes http://www.sysdesign.ca/ |
#2
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Failure in the IR Pickup circuit, or anything between it and the MPU
inclusive of stuck or corroded tac switches. Due to the age even leaky diodes or other components going bad will affect these operations. Start by checking the operating potentials at the IR Pickup and confirm indeed it is picking up and transferring the signals from the remote. If so then trace that signal all the way to the MPU. Severe clipping or loss of the Control Signals from the IR Pickup while in route to the MPU will affect its functions. IMHO it is highly unlikely that you have changed any data parameters when using the universal remote that will result in this symptom. "Jem Berkes" wrote in message .. . I posted about this earlier (Hitachi CT7883) with the original Video Brain Remote Transmitter CLU-600PR which broke down over time. The Hitachi VCR remote control, however, could still control the television perfectly! But * after * trying an RCA universal remote, the television stopped responding entirely to even the good remote control. Now I have obtained a factory remote replacement as per Hitachi's tech support and even this can not control the television set. The TV stopped responding to remote controls. I'm quite certain that the programming efforts of the universal remote put the TV into a bad state. If I can clear the nonvolatile memory somehow, this should fix things. But even leaving the TV unplugged had no success. Any ideas? Is there anything else I can do, short of calling in a repair person to look at a 13 year old TV set? -- Jem Berkes http://www.sysdesign.ca/ |
#3
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If you can't get any help here try posting at
http://www.remotecentral.com/cgi-bin...emote/list.cgi Perion |
#4
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On Sun, 24 Oct 2004 08:17:18 GMT, Jem Berkes wrote:
I posted about this earlier (Hitachi CT7883) with the original Video Brain Remote Transmitter CLU-600PR which broke down over time. The Hitachi VCR remote control, however, could still control the television perfectly! But * after * trying an RCA universal remote, the television stopped responding entirely to even the good remote control. Now I have obtained a factory remote replacement as per Hitachi's tech support and even this can not control the television set. The TV stopped responding to remote controls. I'm quite certain that the programming efforts of the universal remote put the TV into a bad state. If I can clear the nonvolatile memory somehow, this should fix things. But even leaving the TV unplugged had no success. Any ideas? Is there anything else I can do, short of calling in a repair person to look at a 13 year old TV set? Anything is possible, but I can't understand how the use of a remote control can affect the TV in this way. A much more likely suspect is that someone has at some time cleaned the screen by spraying it directly rather than spraying the cleaning cloth, and this is just a matter of coincidental timing. Tom |
#5
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Failure in the IR Pickup circuit, or anything between it and the MPU
inclusive of stuck or corroded tac switches. Due to the age even leaky diodes or other components going bad will affect these operations. Start by checking the operating potentials at the IR Pickup and confirm indeed it is picking up and transferring the signals from the remote. If so then trace that signal all the way to the MPU. Severe clipping or loss of the Control Signals from the IR Pickup while in route to the MPU will affect its functions. IMHO it is highly unlikely that you have changed any data parameters when using the universal remote that will result in this symptom. OK, I'll try to measure the signals to see where the data is getting lost. But I seriously doubt that the pickup circuit stopped working due to physical components failing! The failure to respond to IR commands happened * suddenly * and correlated directly with use of a foreign remote control. It was working perfectly, then universal remote was attempted, now 1 minute later and the TV no longer responds to IR commands. Unless there was a digitally triggered component failure - which is possible but I think highly unlikely, I think that the seized up control circuitry is not physically broken but is reading bad state information from memory. If there was an easy way to clear that memory, I would attempt that first. -- Jem Berkes http://www.sysdesign.ca/ |
#6
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A "stuck" front button, or a "locked up" T.V.,
could cause this! Unplug the unit for a couple of minutes! Also, it may have just coincidently broke..the T.V. that is! If it's failed, & it's not the above...try high voltage capacitors! Rono. I have tried leaving the TV unplugged over night. No such luck. The manual controls on the front of the TV still work. Of course it is possibe the TV encountered a hardware failure at the exact same time the universal remote was attempted. But considering that this 'coincidence' would have occurred in a 1 minute window within 13 years of operation, my guts tell me that the universal remote played a role. Either that or I just experienced a one-in-a-"7 million" coincidence -- Jem Berkes http://www.sysdesign.ca/ |
#7
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Subject: TV stopped responding after RCA universal remote
From: Jem Berkes Date: 10/24/04 11:48 PM Eastern Either that or I just experienced a one-in-a-"7 million" coincidence Or you need to turn off that bank of compact fluorescent lights you've been using while trying remotes!!! ) John |
#8
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Did you say 13 years old? I'm a little surprised no one has mentioned
looking at the circuit board for a bad solder connection. I'm assuming after 13 years of operation, the components must have expanded and contracted a few times. I don't think the remote is the problem, nor do I think it's the cause of the problem. The first thing I'd do is check for cold solder (definitions of "cold solder" may vary but we all know what I'm talking about...right?) anywhere in the IR circuitry....and pretty much anywhere at all since you have the unit open already. Take note of where you find problems with the connections of the components to the circuit board and do a quick test of any active components to see if they've shorted or if they're open. Take good long look at the circuit board to see if there is anything visibly wrong (i.e. bulging capacitors, burnt resistors, cracked transsistors, diodes, ICs, water damage, etc etc etc.). After that, I'd say it's safe to start looking into the circuitry for the problem. If these steps are not taken first, you may very lilkely be doing alot of work for nothing. I hope this helps, Dan Jem Berkes wrote in message ... I posted about this earlier (Hitachi CT7883) with the original Video Brain Remote Transmitter CLU-600PR which broke down over time. The Hitachi VCR remote control, however, could still control the television perfectly! But * after * trying an RCA universal remote, the television stopped responding entirely to even the good remote control. Now I have obtained a factory remote replacement as per Hitachi's tech support and even this can not control the television set. The TV stopped responding to remote controls. I'm quite certain that the programming efforts of the universal remote put the TV into a bad state. If I can clear the nonvolatile memory somehow, this should fix things. But even leaving the TV unplugged had no success. Any ideas? Is there anything else I can do, short of calling in a repair person to look at a 13 year old TV set? |
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