 Posted: Tue Jun 29, 2010 8:25 pm Post subject: |
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1) - It seems that you don't have enough knowledge to do professional diagnosis in electronic complex items. You're going by "intuitive" searching. NOT good. It's at your own risk in further damaging things until they're going to a complete faulty state.
2) - I'm not saying. Technology of DSP says IT ! TFT panels doesn't aquire analog AV signals !! They 're processed by main board via advanced DSP then passed to T-CON for driving the TFT. If T-CON was bad you have had seen some funny/fuzzy pixel art instead of analog wrongly mixed signals like in your posted photo, or even more nothing. Correct diagnosis wil start with sistematic knowlegeable methods not with the TRY IT method.
3) - That is a good first step to diagnose properly. WELL DONE !!!! but insufficient. You have only revealed that ANALOG outputs are in good functional order and NOTHING MORE. You skipped all the DSP and many other further advanced devices.
4) - SAYS NOTHING ! Many VLSI Modern Chips are running "HOT" and only for that the word hot is totally wrongly used. Knowlegde , proper tools, Service manual and instrumentation are required here.
5) - RIGHT !!!!!!
6) - WELL ENOUGH ! So make your choice: LIVE OR DEAD (Your Tellye). Cheers. |
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| Posted: Mon Jun 28, 2010 1:05 pm Post subject: |
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| oh ok i did not know that. everyone thought it maybe a t-con fault. so are you saying the t-con plays no part in the anologue signal, and a t-con would not cause a double image as shown in pictures? as thought everythink passing through t-con. i have connect a 2nd tv to the scart of the lcd and picture displays ok on 2nd set connect through scart socket so thought av was ok. however im not expert. do you still think av board? i have noticed the big chip on the main av gets red hot. however im unsure if thats normal. heres a couple of pic,s of the chip that gets red hot.   |
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| Posted: Sat Jun 26, 2010 7:41 pm Post subject: |
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THE MAIN. The T-CON "doesn't faulty MIX signals like your posted pictures". T-CON works on digital domain signals not on analog video components. |
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| Posted: Sat Jun 26, 2010 11:51 am Post subject: |
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| would you say its the main av board fault or a t-con board fault? thanks |
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| Posted: Fri Jun 25, 2010 10:05 pm Post subject: |
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| Try diagnosing power supply fo ripple or other issues. Probabily the main is defective. Check connectors especially LVDS. |
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| Posted: Fri Jun 25, 2010 9:41 am Post subject: toshiba lcd backlight light only ? |
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| hi i have a Toshiba 46ZV555DB set powers up and i can see the backlight lights the whole screen up ok. fault is that the backlights are on but theres no picture or osd or anythink just backlight untill i can get lcd into normal tv analogue channels.. after some further investigation i managed to get a full picture on lcd, from trying blind with remote to switch av channels i managed to get picture to come on when tv is on normal tv av tv channels. however soon as you switch av channels to hdmi, or scart or feeview mode, the lcd reverts back to just blank screen with backlight on, i can still hear sound on all inputs. i have also noticed when the picture is on in the middle of screen theres thin black lines showing across mid of the screen and also there seems to be a mirror image reflected at at bottom of screen, i have attached a couple of pictures showing both faults.   has anyone come across this problem before? or any ideas what to try next. i have tryed reflowing both main and tcon boards set still remains the same. thankyou |
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