SHARP LC-46D65E Dead power led blinking twice

[tom66]

Re: SHARP LC-46D65E Dead power led blinking twice

A basic analog scope will work to see if there's a signal there - you won't be able to see exactly what it is though. LVDS is high speed, usually 250MHz+ per pair. But the general amplitude of the signals can reveal that a main board is working. For example one one set I had, I pressed the MENU key and could see the signal change on the scope, which told me the main board was probably working.

I would use the 100mV/div range and 1ms/div or faster. The trigger can be set to LINE and AUTO, which will automatically trigger at the mains frequency.

[ronhayes]

Re: SHARP LC-46D65E Dead power led blinking twice

Hi all
Latest update on this set ( First though a big thank you to Tom66/budm for all their patients and help with these faults.)
I am pleased to say this set is now working as it should do with a perfect picture.
After all the tests and measurements carried out with the help from Tom66 and budm I decided to order a replacement T-CON board it was a frustrating week to wait for a replacement but when it arrived i installed it and the picture returned to the set.
The question i am now wandering is does any one know how you could check these T-CON boards so you could be sure it had failed ? Tom you also gave me some help on measuring for signals from main board using a oscilloscope I do think now that my old scope is not really much help with these LCD/PLASMA type TV's And really think i should look for a more up to date digital type scope, Does any one have a input on this for me? ie: what would be suitable does it need to be a certain size in MHz or are these type that connect to laptop any good ? any pointers would be much appreciated of course cost would play a big part in a replacement.

[tom66]

Re: SHARP LC-46D65E Dead power led blinking twice

Laptop/USB scopes are no go for me, I find them generally too limited. The best scope you can buy right now is a Rigol DS1054Z which is available for around £300 inc VAT. It's a 50MHz digital scope. I have the DS1074Z myself which is 70MHz. But, the scopes can all be upgraded via entering a hidden key in - a sort of "hack" which will unlock extra features. This turns them in to 100MHz scopes, 24Mpt memory and unlocks a vast array of extra trigger functions. Very useful.

Testing the T-con would involve checking the LVDS pairs, a digital scope would be extremely useful for this due to the play/pause ability and deep memory (DS1054Z has 24Mpt of memory, which is HUGE.)

[ronhayes]

Re: SHARP LC-46D65E Dead power led blinking twice

Thank you for you advice Tom
Will start looking into that make maybe i will get lucky and pick one up on ebay maybe ?

[tom66]

Re: SHARP LC-46D65E Dead power led blinking twice

Thank you for you advice Tom
Will start looking into that make maybe i will get lucky and pick one up on ebay maybe ?

They're brand new and in high demand, so the price is likely to remain that high for a while.
If you're after a budget option the DS1052E ain't bad, but it's still around £200 - you wouldn't regret the extra £100 for all the additional features.