My sumsung HT-DS420 dvd playrer says "hello" then it says "protection" and then it switches off again,why?

hello,
Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Usually a protect fault will indicate a bad transistor in the amplification section. I suspect that the control circuit is sensing a fluctuation in the power supply and going in to protect mode. (assuming that the protect circuit itself is working properly) If a voltage is too high the unit will go in to protect mode to prevent damage to the speakers and the rest of the unit. Expect a 60 to 80 dollar repair charge depending on how many parts need to be replaced and what the repair labor rate is in your area.Hope this will help........

hi,i can't connect my audio tv to cinema theater dvd

The PWM amp ics are bad. If you have a dc voltage on speaker terminal thats it.

Is the disc just a regular disc, not HD or blu ray?
Is the disc a region 1 coded disc?

If it is, the unit should play it fine.

The audio amplifier IC are fried and need to be replaced

Protect mode will kick in whenever a fault is detected.

You get the unit not powering up, and sometimes you hear a clicking noise, that is the protection switch that keeps shutting down the unit.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

Regards.

I have sumsung HT-XQ100 DVD player it is overheating even it is in cooled room .... I'm afrid to keep it running for long time ...
could you please helpe my ...

Regards,

Try a hard reset: unplug from power source, remove all cabling and wait for 5 minutes before recabling.

If that fails, it is a logic board error, in which case you are probably better off buying a new device..

when you turn it on, hold the power button until it has fully loaded

See my post "HT-DB120 - PROTECTION due to shorted output stage "