The blue tube flashes a few times before HV shutdown. Im thinking my blue crt is cathode arcing. Was told there are no tubes available for this model. I will try my old tube rejuvinator on it. maybe I can blow the slivers off the filament. Can any technicians here advise the price and availability on the blue CRT? I do not have the service manual or the part number. Thanks Paul
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Re: Sony KP51W40 Blue tube flashes
I do not think the old tube rejuvenator will do much if the HV is arcing. The CRT it might leaking some coolant or some moisture from it is causing the arcing.
I would suggest to read the info from this website to re-seal it or replace the coolant.
Let me know if you need further assistance.
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mostly it come from the arcing of it`s fly back...if you are a experienced technician or i mean technician,please clean first with kerosine the flyback.let the hv wire out of the flyback away from tube and parts,it has wire holder.arranged it well.clean with rug that having kerosine all the sorrounding of fly back and to the final cathode...
This is blue CRT problem in tv as it is rear projection tv that has three CRTs red-green-blue inside to project color picture on front screen. Blue CRT (tube) will be replaced to fix the issue and it is job of Pro because lots of adjustments are required after replacement of tube. Local tv repair shop will help you for that. Thanks
This sounds like a bad blue CRT (cathode ray tube) The repair on this is a major job. Beyond the tube replacement it would then require some convergence alignment and possibly some setup on the other related service adj. such as geometry. You may want to get an estimate from a reputable local repair company.
This is a very common issue with these sets. The issue is the CRT's have cathodes that are shorting out. Right now you may only have the blue one failing, but sooner or later the green and red will follow. The CRT's (picture tubes) are no longer available for replacement individually. At this point you have to replace all three CRT's with suitable substitutes. The part numbers I have included. this is not a do it your self repair as you are dealing with replacing CRT's that can and do store charges up to 1,000 volts. Please take a moment to rate my answer. Thanks....
RED CRT A-1502-023-A
If you put the "CR" board back on, the error code will once again be 5 blinks. Your problem is likely the TV's IK blanking circuit. The Kine driver ICs on the CRT sockets boards CR, CB, and CG need replacement along with a few components in the 200 volt supply to the circuit.
Ed did you change the yokes when you put the DPTV series CRT into the PTV chassis? If not its most likely the vertical output or the Horizontal output that got destroyed. If you changed the yoke its most likely the HV generator.
On the DPTV chassis that should shutdown the vertical deflection which would leave audio working worse case scenario would also be the HV generator and Horizontal output.
That chassis has a couple of problems I'd check first before writting it off as a bad crt... The vertical Ic can cause the problems you're experiencing. In that unit it's a TDA8177 (vertical Ic) and if it fails you'll find no 10v supply to the HV generator - thus no HV to light the cans. Could also be the HV generator module itself, but more likely vertical Ic before suspecting the HV module. If you hav a dmm you could measure the voltage on pins 7 & 8 or pins 1 & 2 on the HV plug. If you have nothing there it's the generator - if not highly suspect the vertical.
To answer your question - if the blue can were bad red & green would still light depending on the internal short. If all three are out I'd suspect a loss of HV (high voltage) or B+ as it's referenced.
donot quickly replaced the tube! try this first get 2 megohms 1/2w resistor solder it between blue gun and green gun.if this make the picture still, bad tube.u can still rejuvinate it.if not,bad capacitor in vertical or bad g2(screen) adjuster.
That usually means the x-ray protect circuit was triggered. The set is going into protect shutdown for some reason. It may be a
valid trigger to a lame problem or a fault in the detection circuit itself.
I would hang a scope on there and just watch to see if there is a strange movement in voltage values, and if so, troubleshoot it from there.
The blue picture is a result of a convergence problem.
If you don't know much abou TV repair, I would suggest taking it to a Toshiba authorized servicer for proper diagnosis.