The sound and back light are good. (Model: LN32D403E2DXZA) check input or source and picture settings
SOURCE: TV screen goes blank but power stays on
Sounds like the CRTs are going into protective blanking due to the vertical output ic needing to be resolderd. Try resoldering the vertical IC that may possibly fix the issue.
SOURCE: samsung tv turning off by itself
I had a similar problem where my 61" Samsung DLP was turning itself off very frequently I had resolved to try replacing the bulb. I called a local TV repair place to see if they had my buld in stock. The guy I spoke to actually told me how to fix my problem! There is a little blue switch behind the bulb access door. The inside of the door has a little piece that presses the switch down. The switch is supposed to work correctly weather the switch is in the up or down position but samsung forgot to take expansion from heat into account. If the switch is held in the upper position by the door and the plastic expands to a certain point, it triggers the set to shut off. This does not occur of the switch is held in the lower position. What you need to do is take the access door off and put it back on by sliding it into position from above. That will hold the switch in the down position, eliminating the problem. My set has not **** itself off ever since.
SOURCE: Samsung DLP tv w/ black picture will not power off.
If you are not able to bring up the TV's onscreen menu as well, it appears you have a problem with the TV's mainboard. You didn't mention if the TV had any blinking error codes so if there aren't any lights flashing on the front, are there any on the sides or back to indicate the problem? Not all TV's present error codes, but since the TV is maintaining power, it's worth a shot to look. You could try a power drain:
1. Unplug the product's power cable so the device is not grounded to the house.
2. Press and HOLD the product's own power button for 1 minute to drain the capacitors.
3. Plug the product back into a wall outlet and try to turn it on.
Note: This procedure works with battery operated devices as well so remove the batteries and
hold down it's power button. Electricity can remain in capacitors and on circuit boards
enough to prevent normal functionality. By clearing the residue electricity, your product
will have a fresh start and many times this will resolve a buggy or non-responsive device
that appears to be dead.
If this still doesn't resolve the issue, service would be required so you would want to contact Samsung regardless of your warrant standing for service options.
SOURCE: Samsung HCM 4215W when on, no picture timer blinks & chirp sounds
Sounds like a shorted component in the power supply or the high voltage circuit.
Time to call a professional.
Kolbrun
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