I have a Samsung HCP4752W Rear Projection TV (Chasis P59A) The colors are blurred and I have two semi circles at the top and bottom of the screen giving an hourglass effect, so reading all of the other posts I believe I have a convergence problem. I have replaced the STKs but the problem remained. Has anyone got any ideas?
I have the same model tv HC-P4752W. i have replaced BOTH convergence ics. i noticed in this post that absolutely noone mentioned to use the higher amperage STK392-040. the -040 is a 7 amp version of the -010(-010 is 5 amp) but the -040 is what any tv repairshop that knows thier stuff will reccommend. you can also use the STK392-020 which is the 6 amp version but i would highly suggest the -040 because theyre around 10/each on amazon give or take. DO NOT GET CLONES IF AVOIDABLE. ive not tried them myself but i heard from numerous other forums they do not last. i used oz freeze instead of the white paste for longetivity of the ics. NUMEROUS forums advise against the white stuff as the chips get HOT and youd be replacing again soon.so better stuff is good(freeze,ic diamond,arctic freeze) will not damage nothing. SOLDER CORRECTLY!!! do not splurge. its not hard to learn and will save you a huge headache. and as told to me by a tv tech on the phone, when getting resistors use atleast 1/2 watt maybee even 1 watt for the 3.9 ohms.(they look like 1/4 watters) bigger wattage units WILL NOT damage nothing except the lack of headaches:). and by all means you CAN get away with carbon film standard run of the mill resistors but they arent my first choice. use flameproof if possible they are dirt cheap. same for the 150 ohm ones. bigger wattage is better long as they fit and use flameproof ceramics if possible last resort carbon film. my set works near perfect but i still need to replace the resistors and it may need manual convergence.:)
if you follow the tips that i have passed onto you free of charge that were advised to myself by the professionals your repair will outlast the set itself.
I have the same covergence problem on same model. I have checked the 3.9ohm fusible resistors all twelve seem to be OK, they read exactly 3.9 +/-0.05 ohms. I don't suspect the 150 Ohm resistors since they seem to be normal ceramic resistors across the input and output of each channel of the STK chip. If they burn, there should be some kind of discoloration, which is not the case. I hope that changing the STK only will do me some favor of getting the unit back to operation. Is it OK to use the same conducting material as that used in PC microprocessors? How did you solve the V-Shape line problem, just in case I get it.
Each convergence IC has a fusible link going to the IC. On the foil side of the board you will see the fuse size, usually 3.15a. Check both with an ohmmeter, like you would check a normal fuse. Replace the one that is open and that should take care of your problem. Good Luck.
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