SOURCE: samsung lcd tv le40r8. tv will not switch on.
The problem is the mainboard tried to turn on TV but failed due to internal circuit problem. Normally, the power supply board is malfuntioned.
SOURCE: periodically we will lose pic and sound for a few
You may have power supply DC filter caps problem, need to check the caps and the output voltages before and after it is not working.
If you are going to DIY and have proper tools, knowledge of electronics and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
SOURCE: Samsung model LNT4053 H. Turn on
Re:Turn on power, get the bleep & blue light at bottom comes on.
Picture comes in with no sound. Turn off & repeat & then it
works
Problem is a faulty component. There are on board components, like capacitors, whose role is storing and absorbing charge when the circuits are "warming up". A tini part with this function is not working, for this reason the audio works only after restart.
The fault can be located in audio circuit, internal tuner or main controller board.
The repair involves testing at component level and replacing faulty part. If TV is still in warranty repair will be covered.
To have it repaired contact Samsung or future shop, they will send you a qualified technician.
Here contacts:
Future Shop: Contact us
Samsung: Contact Us
Support pages:
Samsung Support
Customer Support(Future Shop)
Parts:
Samsung TV Parts ' ShopJimmy
Replacement Parts
SOURCE: NORCENT MODEL PT4231.TURN THE MASTER
The continuous flashing indicates that the power source is in protected mode: another part inside the tv has failed, it draws an excessive amount of current and that has been detected by the safety system of the power source who has shut it down to protect it and the rest of the tv.
Since the status light goes to orange for a few moments before going red it means that the problem is outside the power source. The most probable cause is indeed with the mainboard; if it would have been one of the Sustain boards the failure would have been much more brutal and instantaneous (no orange on the status light) .
To certify that you will have to test the mainboard with an oscilloscope to find out if the processor is operational. If you don't have one just swap it.
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