Entertainment Center: TVs, Stereos, VCRs and DVDs - Rear proj. Redish => black, sound ok, PLEASE HELP !!!
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davidrf
08-14-05, 08:14 PM
Hello!
A friend gave me a 10 year old Sony rear projection 46" TV (Sony Videoscope KP46XBR35, 1995). It worked well up to ... the second DVD I watched on it.
1 - Symptoms:
The screen started getting redish intermittently, then would remain redish for a couple of minutes, and finally turned black while the sound working well. It now does that every time I turn on the TV. Sometimes it does not even start. If I leave the TV off for a while (one night, a couple of day), it works again very well for 10-15 minutes, and the the same symptoms happen again.
This problem occurs with every sources: DVD, TV tuner, etc.
Also, the power light on the front flickers . It is an error code (as I learnt reading more posts). In my case, it is a continuous blink once a second, with no pausing, which means:
"No reply from the jungle IC301 (data bus is busy, shorted to ground or held high), IK video path is defective."
2 - Troubleshooting attemps:
- I tried to do a "power reset" as described in Sony's support web site. It did not work. I called their hotline, and it was the "last possible troubleshooting they could suggest"...
- I talked to a local repair center (I'm in Iowa City, IA) on the phone, and they told me that it is certainly a CRT dying, and that the repair would not be worth (300-450$ per CRT to replace, just for the pieces). However, reading several posts about similar problems I got the impression that it might not be a CRT problem, and could perhaps be fixed for... less.
- I tried to adjust the G2/screen controls (increase CRTs voltage ?) to prevent the security automatic shut down, as described elsewhere. When increased, glow and curved lines, with color corresponding to the controlled CRT, appear on screen (as expected, if I understand well), and the image (DVD and TV tuner sources) is visible in the background in a very altered way (TV menus are barely visible when selected).
- I read somewhere that changing the IC301 had solved the problem in a similar situation on another Sony rear projection system. Is that something that I could do myself?
Suggestions, other diagnostics and solutions ? :thinker: I spent hours in the Internet to try to find more information and solutions. :wall: Post thread elsewhere, never got answers...
PLEASE HELP !!!
I'm not an electronic technician or engineer (I'm a scientist), but more qualified people in my area seem to be reluctant to do anything on this TV (probably because they want to protect me from costly repairs, meaningless for such an old system! what I appreciate in principle). But I kind of would like to repare it still, and it seems to me that changing a bunch of cheap components might make it.
Also, if you have any suggestion about a repair technician in my area (Iowa City, IA) who would really look for identifying the problem without changing a whole board or CRT when just a capacitance or a transistor needs to be changed, I would deeply appreciate.
Thanks !!! :D
A friend gave me a 10 year old Sony rear projection 46" TV (Sony Videoscope KP46XBR35, 1995). It worked well up to ... the second DVD I watched on it.
1 - Symptoms:
The screen started getting redish intermittently, then would remain redish for a couple of minutes, and finally turned black while the sound working well. It now does that every time I turn on the TV. Sometimes it does not even start. If I leave the TV off for a while (one night, a couple of day), it works again very well for 10-15 minutes, and the the same symptoms happen again.
This problem occurs with every sources: DVD, TV tuner, etc.
Also, the power light on the front flickers . It is an error code (as I learnt reading more posts). In my case, it is a continuous blink once a second, with no pausing, which means:
"No reply from the jungle IC301 (data bus is busy, shorted to ground or held high), IK video path is defective."
2 - Troubleshooting attemps:
- I tried to do a "power reset" as described in Sony's support web site. It did not work. I called their hotline, and it was the "last possible troubleshooting they could suggest"...
- I talked to a local repair center (I'm in Iowa City, IA) on the phone, and they told me that it is certainly a CRT dying, and that the repair would not be worth (300-450$ per CRT to replace, just for the pieces). However, reading several posts about similar problems I got the impression that it might not be a CRT problem, and could perhaps be fixed for... less.
- I tried to adjust the G2/screen controls (increase CRTs voltage ?) to prevent the security automatic shut down, as described elsewhere. When increased, glow and curved lines, with color corresponding to the controlled CRT, appear on screen (as expected, if I understand well), and the image (DVD and TV tuner sources) is visible in the background in a very altered way (TV menus are barely visible when selected).
- I read somewhere that changing the IC301 had solved the problem in a similar situation on another Sony rear projection system. Is that something that I could do myself?
Suggestions, other diagnostics and solutions ? :thinker: I spent hours in the Internet to try to find more information and solutions. :wall: Post thread elsewhere, never got answers...
PLEASE HELP !!!
I'm not an electronic technician or engineer (I'm a scientist), but more qualified people in my area seem to be reluctant to do anything on this TV (probably because they want to protect me from costly repairs, meaningless for such an old system! what I appreciate in principle). But I kind of would like to repare it still, and it seems to me that changing a bunch of cheap components might make it.
Also, if you have any suggestion about a repair technician in my area (Iowa City, IA) who would really look for identifying the problem without changing a whole board or CRT when just a capacitance or a transistor needs to be changed, I would deeply appreciate.
Thanks !!! :D