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
|
|||
|
|||
Toshiba Model# CF2044J Chassis# 8900 sparking
its wrote:
Let me first start out by saying this is a 13 year old set, not to mention I'm a student, so it's just not very cost effective to have it professionally repaired. I have replaced C301 and C305 to fix a vertical drift problem some time back. I also had to later resolder all joints on the CRT neck board because of cracked solder joints. Now, there is sparking in the CRT socket sparkgap for the focus wire. This arcing began probably about 6 months ago, but rarely occoured. Being in a similar position, I'd first try examining the spark gap surrounds for carbonisation, and removing any I found. Followed by a spray of 'damp start', or some other dielectric film spray. Do ensure that you remove the film from the actual spark gap electrodes. -- http://inquisitor.i.am/ | | Ian Stirling. ---------------------------+-------------------------+-------------------------- Among a mans many good possessions, A good command of speech has no equal. |
#2
|
|||
|
|||
Toshiba Model# CF2044J Chassis# 8900 sparking
The two low cost possibilities.
Bad solder connection to the ground connection of the flyback focus/screen control, remove the old cracked solder and resolder. Dirt build up in the focus spark gap, give it a good cleaning. The not so inexpensive possibilities. Bad capacitors in the main power supply causing a slightly overvoltage condition, get a good ESR meter and give them a check. If it uses the SMPS look closely at c840,c841,c863, and c822 and all the others. Flyback focus control is going bad, flyback will need replaced. Asti Magnetics is about the least expensive for aftermarket flybacks if they have it. David its you wrote in message ... Let me first start out by saying this is a 13 year old set, not to mention I'm a student, so it's just not very cost effective to have it professionally repaired. I have replaced C301 and C305 to fix a vertical drift problem some time back. I also had to later resolder all joints on the CRT neck board because of cracked solder joints. Now, there is sparking in the CRT socket sparkgap for the focus wire. This arcing began probably about 6 months ago, but rarely occoured. It has been becoming more frequent with time, but after the set is warmed up it essentially disappears. It doesn't occur at every startup, but startup is when it will generally happen, usually no more than 2 times. It occurs every time after the CRT has been discharged (maunally of course). I realize this is probably due to excessive voltage, but what would cause this? Drifting components? Or could the CRT just be going bad? Any help is always appreciated, and thanks in advance, Steve |
#3
|
|||
|
|||
Toshiba Model# CF2044J Chassis# 8900 sparking
Let me first start out by saying this is a 13 year old set, not to
mention I'm a student, so it's just not very cost effective to have it professionally repaired. I have replaced C301 and C305 to fix a vertical drift problem some time back. I also had to later resolder all joints on the CRT neck board because of cracked solder joints. Now, there is sparking in the CRT socket sparkgap for the focus wire. This arcing began probably about 6 months ago, but rarely occoured. It has been becoming more frequent with time, but after the set is warmed up it essentially disappears. It doesn't occur at every startup, but startup is when it will generally happen, usually no more than 2 times. It occurs every time after the CRT has been discharged (maunally of course). I realize this is probably due to excessive voltage, but what would cause this? Drifting components? Or could the CRT just be going bad? Any help is always appreciated, and thanks in advance, Steve |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Dewalt Recalls? | Metalworking | |||
RCA Model P61830BL (Chassis PTK 195 BT) Proj. TV standby power problems. | Electronics Repair | |||
RCA Model P46732BA (Chassis PTK 169 PGA) Projection TV- No Video | Electronics Repair |