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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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Sony KV32S22 led flashing
Hi all,
Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#2
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A specific sequence to the flashes would indicate a specific error code (4
flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#3
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Art,
I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#4
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Seems the replacement flyback was bad. No focus voltage from it. I
replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#5
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Bright light source and a magnifying glass Congrats on the LOPT diagnosis
and fix. "Kirk S." wrote in message ... Seems the replacement flyback was bad. No focus voltage from it. I replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#6
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Art,
Nah, I just follow directions really well... Hunt and peck, search the internet, make a bunch of mistakes, learn a little bit each time, come back here and plead for help, try not to get electrocuted, etc. I'll probably just fix the input jacks since I don't really care about variable output sound jacks. Maybe if I get bored... Kirk S. P.S. This thing is HEAVY... "Art" wrote in message ... Bright light source and a magnifying glass Congrats on the LOPT diagnosis and fix. "Kirk S." wrote in message ... Seems the replacement flyback was bad. No focus voltage from it. I replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#7
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Well, I patted myself on the back too soon. When I started to adjust the
focus and screen controls, the picture blanks out. I'm looking for the HV adjustment so I can set it with a HV probe and cannot seem to find it on the board or the schematic. I had a good picture for about 10 minutes and then it blanks out. If I turn the screen down all the way, I can turn it slowly and have the picture come on for a little while until it shuts off. I figure I'm over specs on HV. Thanks! Kirk S. "Art" wrote in message ... Bright light source and a magnifying glass Congrats on the LOPT diagnosis and fix. "Kirk S." wrote in message ... Seems the replacement flyback was bad. No focus voltage from it. I replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#8
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"Tom MacIntyre" wrote in message
... On Sun, 7 Nov 2004 11:06:23 -0600, "Kirk S." wrote: Well, I patted myself on the back too soon. When I started to adjust the focus and screen controls, the picture blanks out. I'm looking for the HV adjustment so I can set it with a HV probe and cannot seem to find it on the board or the schematic. I had a good picture for about 10 minutes and then it blanks out. If I turn the screen down all the way, I can turn it slowly and have the picture come on for a little while until it shuts off. I figure I'm over specs on HV. Thanks! Kirk S. Failing CRT, usually the green cathode. The IK circuit is blanking the picture due to the cathode imbalance. Turn the screen up until you get a steady and usable picture. If that doesn't work, the CRT needs to be buzzed a bit, and that'll get maybe another 6 months out of it before it needs to be done again, this based on my experience. Tom Thanks! If I hook up a signal source, it blanks out. Otherwise, the picture will stay stable snow. The manual states something about checking the hold down voltages and adjusting a couple resistors if the flyback is changed. Is there a way to adjust the HV on this set? What exactly is the IK circuit? If I adjust a couple resistors, aren't I defeating the purpose of the comparator circuit? Kirk S. "Art" wrote in message ... Bright light source and a magnifying glass Congrats on the LOPT diagnosis and fix. "Kirk S." wrote in message ... Seems the replacement flyback was bad. No focus voltage from it. I replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
#9
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Oh, That IK circuit... I see it on the schematic. Can I try to run it with
the neck board disconnected? The picture color is pretty balanced however the picture control is set all the way up and my universal remote doesn't work. Is there a way to adjust the set from the front panel? Thanks! Kirk S. "Kirk S." wrote in message news "Tom MacIntyre" wrote in message ... On Sun, 7 Nov 2004 11:06:23 -0600, "Kirk S." wrote: Well, I patted myself on the back too soon. When I started to adjust the focus and screen controls, the picture blanks out. I'm looking for the HV adjustment so I can set it with a HV probe and cannot seem to find it on the board or the schematic. I had a good picture for about 10 minutes and then it blanks out. If I turn the screen down all the way, I can turn it slowly and have the picture come on for a little while until it shuts off. I figure I'm over specs on HV. Thanks! Kirk S. Failing CRT, usually the green cathode. The IK circuit is blanking the picture due to the cathode imbalance. Turn the screen up until you get a steady and usable picture. If that doesn't work, the CRT needs to be buzzed a bit, and that'll get maybe another 6 months out of it before it needs to be done again, this based on my experience. Tom Thanks! If I hook up a signal source, it blanks out. Otherwise, the picture will stay stable snow. The manual states something about checking the hold down voltages and adjusting a couple resistors if the flyback is changed. Is there a way to adjust the HV on this set? What exactly is the IK circuit? If I adjust a couple resistors, aren't I defeating the purpose of the comparator circuit? Kirk S. "Art" wrote in message ... Bright light source and a magnifying glass Congrats on the LOPT diagnosis and fix. "Kirk S." wrote in message ... Seems the replacement flyback was bad. No focus voltage from it. I replaced the flyback with another and now it comes on. I used my scope to check for activity on the horizontal and vertical circuits. They were there so I have to believe the set wasn't coming up because of incorrect voltages. Now, the led flashes several times and the set comes up. Need better eyes to fix the traces where the board is cracked. Input/Output jacks don't work. Kirk S. "Kirk S." wrote in message ... Art, I have power to the heater elements in the crt and the set responds to the remote for power on/off. I can hear the HV crackle when it fires up. I'll look for actitivy on the controller IC lines to see if something could be getting pulled to ground and check outputs of the power supply to be sure they are within specs. Thanks! Kirk S. "Art" wrote in message ... A specific sequence to the flashes would indicate a specific error code (4 flashes, 4 flashes, etc). Constant flashing indicates probable power supply or controller failure. "Kirk S." wrote in message ... Hi all, Found this by the side of the road and decided to give it a try. Ordered a couple Sony TV p/s repair kits and after installing the first one, I got a big fat spark from the flyback and dead components. Replaced the flyback and p/s components again and now I can hear the set power up however the led flashes constantly. One other note, the set was dropped at one point and the main pcb cracked near the AV input/output jacks. Someone attempted to repair them once and from looking at the schematics, the inputs that were repaired were unused. What does the constant flashing indicate and where do I start looking? I'm tempted to remove everything associated with the external jacks. Will the set do this if there is no input signal? Thanks! Kirk S. |
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