Im about to replace the Convergence IC on my Mitsubishi ws-55511 is it better to completely remove the board or is it possible to replace the IC while installed in the projection unit.
Hello Warren. I just fixed the convergence on an HCM5525W a few months ago. You need to find the two fuses near the convergence chips. They are solid green in color, and look exactly like resistors, but without the color bands on them. They're both soldered on the board, so you'll have to remove the board from the set. One, or both have failed. These are identified on the under-side of the board as a sine-wave. You can use your ohm meter directly across, and see if you have continuity or not. Their values are printed on them in really fine print. I forget the value myself. They cost a little over a buck each.Hello,
I have a Samsung HCM5525W, I replaced both Ic's, and when I fired it up I cannot adjust red, and it is bowed along the top and sides. I check and found that I had two burnt resistors, the rz144 and rz145. I replaced those with 2 3.9 ohm 2 watt resistor. When I turned the set back on the red is still not adjustable. When I was removing the IC's i did knick the board a bit, but I bridged the gap I created with a bit of solder. Any advice on what could be causing this problem? Thanks in advance for your help!!
I found the service manual online, (very inexpensive). While taking things apart, and removing the dead ic's I discovered that one of them had a single 'glob' of heat sink compound...that covered approx 20% of the metal back....and that was the only contact the ic had with the heatsink. It was very thick....and dried out. Replaced both IC's, (I used arctic silver thermal compound), and four 6.8 ohm resistors. Fired it up, worked great, and convergence was dead on.What a wonderful thread!
I have a Magnavox 51MP392H/17, and the red convergence has died. I checked inside, there are a couple of resistors that are discolored, (along with associated discoloration on the PCB. I was unable to find out if the STK394-160 IC's are drop in replacements for my model, so I ordered the 394-120's, and a bag of resistors, (from one of the recommended suppliers). Now to find a service manual....