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
Posted to sci.electronics.repair
|
|||
|
|||
Sony KDF-42WE655 DLP dumps autoprogram
I have a Sony KDF-42WE655 DLP set that recently stopped storing channels. For the past 5 or so months our channel line up has consisted of about 30 channels (we get basic cable) and about 100 channels of "no signal", black screens etc. I decided to run the auto program option in the menu in hopes that some of these erroneous channels would disappear. After the auto program completed, our channel line up was great. It appears that after the set has been off for a few minutes and turned back on I am greeted with a "no signal" screen with no channels. In some cases the tv will not change channels; ie when channel +/- is entered the last digit on the screen will flicker but will go back to its original position. Interestingly enough, when the set is turned off and immediately turned back on all channels remain. It seems anything longer than 1 minute and the channels dump. What makes this equally interesting is that I have the same set in my basement (55" version) that still has the entire channel line up. I have not run the auto program on this in fear of the same thing happening. Our 42" "works" but we have to run the 50 minute auto program every time we watch to watch tv now. Any thoughts on what might be causing this would be greatly appreciated. Thanks, Lenny |
#2
Posted to sci.electronics.repair
|
|||
|
|||
Sony KDF-42WE655 DLP dumps autoprogram
The obvious (though not necessarily correct) diagnosis is that whatever
"holds" the memory when power is off is failing to do so. Look over the board with the tuner. If you spot a large CR-type lithium cell, that's probably the problem. Replace it. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
Sony KDF-42WE655 DLP dumps autoprogram
On Sun, 2 Dec 2012 19:05:24 -0800 (PST), klem kedidelhopper
wrote: I have a Sony KDF-42WE655 DLP set that recently stopped storing channels. For the past 5 or so months our channel line up has consisted of about 30 channels (we get basic cable) and about 100 channels of "no signal", black screens etc. I decided to run the auto program option in the menu in hopes that some of these erroneous channels would disappear. After the auto program completed, our channel line up was great. It appears that after the set has been off for a few minutes and turned back on I am greeted with a "no signal" screen with no channels. In some cases the tv will not change channels; ie when channel +/- is entered the last digit on the screen will flicker but will go back to its original position. Interestingly enough, when the set is turned off and immediately turned back on all channels remain. It seems anything longer than 1 minute and the channels dump. What makes this equally interesting is that I have the same set in my basement (55" version) that still has the entire channel line up. I have not run the auto program on this in fear of the same thing happening. Our 42" "works" but we have to run the 50 minute auto program every time we watch to watch tv now. Any thoughts on what might be causing this would be greatly appreciated. Thanks, Lenny That's a LCD rear projection, not a DLP. Note the 'screen door' effect. Training and service manuals are available free at http://elektrotanya.com/?q=showresul...ia=tv&kat2=all It's unlikely channel information is stored using battery backed up RAM, that went out in the 90's. Between the training and service manuals you should be able to narrow it down to a single board. If you don't have any luck isolating it to a signle IC, boards are available on eBay PlainBill |
#4
Posted to sci.electronics.repair
|
|||
|
|||
Sony KDF-42WE655 DLP dumps autoprogram
On Dec 3, 12:43*pm, wrote:
On Sun, 2 Dec 2012 19:05:24 -0800 (PST), klem kedidelhopper wrote: I have a Sony KDF-42WE655 DLP set that recently stopped storing channels. For the past 5 or so months our channel line up has consisted of about 30 channels (we get basic cable) and about 100 channels of "no signal", black screens etc. I decided to run the auto program option in the menu in hopes that some of these erroneous channels would disappear. After the auto program completed, our channel line up was great. It appears that after the set has been off for a few minutes and turned back on I am greeted with a "no signal" screen with no channels. In some cases the tv will not change channels; ie when channel +/- is entered the last digit on the screen will flicker but will go back to its original position. Interestingly enough, when the set is turned off and immediately turned back on all channels remain. It seems anything longer than 1 minute and the channels dump. What makes this equally interesting is that I have the same set in my basement (55" version) that still has the entire channel line up. I have not run the auto program on this in fear of the same thing happening. Our 42" "works" but we have to run the 50 minute auto program every time we watch to watch tv now. Any thoughts on what might be causing this would be greatly appreciated. Thanks, Lenny That's a LCD rear projection, not a DLP. *Note the 'screen door' effect. *Training and service manuals are available free athttp://elektrotanya.com/?q=showresult&what=KDF-42WE655&kategoria=tv&k... It's unlikely channel information is stored using battery backed up RAM, that went out in the 90's. *Between the training and service manuals you should be able to narrow it down to a single board. *If you don't have any luck isolating it to a signle IC, boards are available on eBay PlainBill Thanks for the link. Lenny |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Unvented HW cylinder dumps HW | UK diy | |||
Dumps sellng. Both tracks. Track2 only. USA. Asia. | Home Repair | |||
Sony gurus?......Sony 65xbr10w circa 2000/1 & 720p'support'........... | Electronics Repair | |||
Craftsman Dumps Lifetime Warranty? | Home Repair | |||
Sony multisystem TV model KV-T29CF1 will not autoprogram | Electronics Repair |