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Sharp LC-42DH77E
OldLes:
A couple of weeks ago, we had the front off, and re-checked all lamps with the Chi-tester. All OK. Rechecked the three tubes swopped out months ago, all seemed OK, so decided to re-fit them rather than leave the three shorter ones.
I then carefully wrapped each tube clip with 0.6mm silver plated copper wire (as used by my Ex for jewelry making) and then crimped it tightly.
Soldered a short flexible lead to each pad on the inverter board.
Carefully reassembled, this time with the soldered link on the correct (I think) capacitor, C7561.
Tried switching on mains whilst holding input and vol -. Flashing amber, then continuous green, and eventually about 1 to 2 seconds of lit tubes. Spotted UTV Ch 52 on RHS, but no sign of the infamous "K". Repeated attempts seemed to be accompanied by the set cycling thro' inputs each time (DTV, the "No Radio Channels) etc.
Tried various combinations of buttons, but never a sign of the "K".
I am moving towards the decision to return it to the amenity site, but hate the idea after all this time, with such a beautiful looking set.
Les.
Kilroys:
You had to use the power cord when switching
off and on the set to access adjustment menu, not the power button.
downunder:
OldLes, that CCFL tester, is that the one with a longish probe, an earth clip and red/green LEDS - only have a vague memory of one that a friend of mine bought online. First tv he checked was a Samsung. The tester read all CCFLs as good. I was somewhat dubious so I later got him to crack the panel open. What do you know, 2 tubes were out. Personally I don't trust them as they test the tubes in an inert state and it seems they tell porkies.
OldLes:
Kilroys, Yes, tried both physically plugging in, as well as the lazier route of using mains switch at 13A socket.
We could switch off and back on again with the set's on button, seeing again briefly the Ch No or DTV etc, followed by lamps off again. Using the mains switch, at no time did we see the "K" giving use access to "stuff".
Les.
Turnip:
Hi Young Les,
Think mentioned B4 that all those inverter to screen connectors are suspect - suggest hard wire the lot - saves time, and did the job.
Did mine only in thin plastic covered copper -
Copper is getting expensive, esp for plumbing improvements - Called in at a supplier for some yards(metres) of 14mm (half inch) - horrid - pricewise.
Sharp Inverter/Screen hard wire requires just a few Centi-whatsits, if you're nifty with the side-cutters.
Not so nifty myself, and kept snipping the ends off - but eventual success - Old Chris.
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