PT-53wx42F with convergence issues around the edge

Hi,

I looked at your image, nice. 

If the customer convergence menu allows you to make a Red Horizontal adjustment (Red cross or intersection moves left and right), then all is good.  You need convergence alignment. Do all the points using on-screen instruction. If not good enough, do again, starting with center adjustment and check each position (1-9) If customer controls do not align close, then you must do adjustment in service menu.  Do course mode first, then touch up points with more if you have the time and patience.

If the Red Horizontal adjustment does not move the red vertical line from side to side, you still have a fault.

Faults could be:

1. Open low ohm resistor for Red Hor amplifier. The resistor may read near normal with an ohmmeter and no power. It can become an open circuit or higher resistance when it is heated by current flow and the amplifier is "on". The "Red" resistors are located near the end of the ICs where the Red Plug is.  Green resistors are in the Middle and blue at the opposite end, near the blue plug.
2. Dud STK 392-110 IC,  Many Dud or useless ICs are sold on the Internet, some with 1 year warranties. We do TV service for many Panasonic and other Rear projection TVs across Canada. We have known and trusted sources of top quality parts that cost more than $9.99 per IC.  Serious TV service repair shops guaranty their work and use the correct parts to ensure there is efficient repair and no call-backs.
3. Thin film resistors or capacitors near the STK pins were disturbed when replacing the ICs. They could be twisted and make no connection. They could be damaged from heat. This is visually detectable with a magnifying glass.  Check IC solder job at the same time.
4. If you have soldered OK, done no damage, and resistors are OK, most likely the problem  is a defective Red amp IC (nearest the red plug). If one is dud, change both from a different source and utter a curse on the low-life supplier. Use only 110 or 120 IC.

easyab

tchinds said: I purchased a new set of STK392-180 convergence chips and installed them. I still have the same problem so I'm 99% sure it's not the convergence chips. Any suggestions/help?

If you are repairing a Panasonic  RPTV that had STK 392-110, use 110 or 120 ICs.  If you use the 180, the value of the low ohm resistors will not be correct for efficient operation. Re-design of the convergence circuit is required. 180 and 110 ICs have different charecteristics and require different value low ohm resistors when substituted.  Panasonic have made many million TVs. Panasonic engineers are very clever fellows, top notch in the TV design area.

The salesman touting "Replacement/substitution" ICs is mis-informed.  Also beware of poor quality and just plain "Dud" ICs, many are sold by the flashiest websites.

There is no description of what "same" problem  you are having. Low ohm resistor(s) for functions that do not work are most likely open from the initial failure and have to be  replaced.   Resistors that are partially damaged in the initially failure sometimes open when new ICs are installed.  They measure ok with an ohmmeter when checked at the time of the IC change and open when the new ICs are turned on.

easyab

I had the three blink lights problem, so I replaced both STK 392-110's with STK 392-120 and replaced all the 2.2 ohm (SKU 440-2.2 / PN 2W2D2) resistors from www.mcmelectronics.com. Because, one of the original 2.2 ohm resistors showed signs off heat, so even though it measured fine, I replaced all those resistors.

The TV works fine for a day, but today the picture now has the convergence problem.

Thoughts...