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Sharp LC-42DH77E

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Turnip:
Hi Les,

Got that Chinese tube checker, and all tubes tested OK (even that one I broke and replaced with a 40 inch with long wires) before I reassembled the screen.

Hard wired every tube to those convenient inverter feedback caps - wrapped one end around the tube clips, as wouldn't solder, then glued to keep things in place.

Didn't manage break anything on reassembly - tedius job with all those screen screws.

Thought to leave water based glue to set for some days before I try fire up.

Cowardice maybe, but genuine Sharp gives me that sinking feeling.

Later - glue set - fired up, did a total reset - OK - whew - Chris

Kilroys:
I have never had a bad tube on the 42DH77 sets.
Well one, when I was loosen the clip from the tube and was in a hurry.
LV-347 describe the most common error, guessing it's because spring is
soft from the heat and makes poor contact.
If the set takes a long time to start, the clips look ok,
no burnt mark on the inverter, it could be LV-441.
Never loosen the inverter if you are not sure its the clips
or you will have problems with the contact.
I have had both, but most common the clips.
After changing the clips you had to clear the lamp errors.

Turnip:
Hi Kilroys,

Like you never had a duff tube (before I broke one) but those inverter contacts are total rubbish. On replacing the inverter panel, several didn't make contact.

Wouldn't suggest new spares as they're expensive and no better than the original horrid design.

Next time won't bother dismantle the screen, just snip plastic over inverter connectors and hard wire all 18 tubes to the appropriate side of the inverter feedback caps.

Prob is - edge connectors contacts won't solder, but a good fine wire wrap with adhesive might be as good as it can get.

Done one, fingers crossed - Chris.

Ecosse2253:
Hi guys just repaired two of these  sets and its not the lamps it's the crappy clips that  make a bad connection and arc making a hole on the inverter board , just turn down your iron so the solder doesn't  melt to liquid and solder over the inverter holes take the clips and run the iron over the the connecting point of the clips bend them up if needed reset the lamp error in the service menu and vola  set fixed hope this helps
Alwyn   :13:

Turnip:
Hi Alwyn,

You're right with the inverter board trouble - Prob is, clips don't solder - still suspect a hard-wire jobby is the best biz, but yet only done one - Voila - Chris.

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