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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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PTK195 bad convergence
I heard this model was plagued with bad power supply boards.
Well, this one still worked, it just died out in about 2 minutes, and lost convergence correction. So, I resoldered the board, changed out all secondary diodes, and so forth. Still, itll be perfect for about 2 minutes, itll it dies out, and I loose convergence. I determinded that something was shutting down the supply, or the supply itself is bad, so I bypassed the opto on the supply, and when I did this the system stayed on for about 10 minutes. As soon as I started to go into the menu correction, I went to red convergence, and began to reconverge the red. It moved a little and the TV powered off. I powered it on, and now the convergence fluctuates between corrected, and lost. back and forth. Im stuck, anyone have a schematic or a heads up on what to do? this one has that ****ty ass digital convergence that I severely hate. |
#2
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PTK195 bad convergence
The PTK195 also had a problem with the convergence MCU shield shorting
different lines to ground, crt coolant leakage, and conductive glue under surface mount bypass capacitors. |
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