Question about RCA P56950 56" Rear Projection Television
I have a P56938 with a PTK195S1P chassis. I have done a lot of reading of other posts and have a couple of questions. When i look in the back of my set I only see one fuse (back center) and not 3 as i have read. Is this the correct fuse to check to see if its blown (which it has not BTW). Also right infront of you is a circuit board which is mounted up on the right facing back which contains a single IC on it. I am getting bowing of my picture and also the menu is missing the adjustment sections. Is the board that i am seeing the one that i should change or just change the IC. Also how can i tell if its the board or the amp that has gone. I have taken photographs if it will help in anyway
Thanks in advance
The convergence section is using a STK IC ,if you find ic screw in a heat sink that ic has mark stk ,the problem of convergence is the STK and resstor change value this is to be checked, these resistor is associated to the pins of stk and reheating all joints of parts there this necessary to this kind of problem .. find a tv technician to do works for you ... in order to avoid high voltage shock..
Posted on Jun 26, 2008
I've found some this i nfo that could help you troubleshoot your TV.
Your problem is likely to be in the convergence board power supply
p/n 250868. May not be supplying the - and + 15 volt supply, abd the +45
volt and - 45 volts account shorted diode cr19710. p/n 164590. also replace
cr19709 the one next to it same part #. Also if stk730-130 is bad it can
cause this problem. Also check r 19703 (750k 1/2watt) may be open,
q19700(bc457)or nte123a could have base emitter open.
Posted on Jun 26, 2008
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Posted on Jan 02, 2017
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