Question about Sony Audio Players & Recorders
push power protect is error signal shows problem in power amplifier board, mostly power amp out
IC STK402-100S found deceptive.
contact nearest Sony service center for proper repair.
Posted on Sep 29, 2008
Protect mode will kicking whenever a fault is detected.
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 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.
Posted on May 04, 2009
SOURCE: My Sony Home Theater system
MHC-DP900D HAD SAME PROBLEM- PROTECT, PUSH POWER. TRACED CAUSE TO AMP. DC PROTECTION CIRCUIT ON AMPLIFIER BOARD. ACTUAL FAULT WAS A SHORT CIRCUIT OF THE AMP. IC LEFT CHANNEL OUPUTS (STK412-030 PINS 10 & 11)
EXCESSIVE SOLDER APPLIED DURING MANUFACTURE HAD PROBABLY BEEN HEATED UP ENOUGH DURING USAGE TO BRIDGE THE PINS. CURRENTLY USING THE UNIT WITH RIGHT CHANNEL ONLY UNTIL I PURCHASE A NEW IC. BYPASSED DC PROTECTION FOR LEFT CHANNEL BY ISOLATING INPUT TO DC DETECT TRANSISTOR.
This is what I could find, it looks like it will need serviceing unless you can do it yourself, it can be deadly if you don't know exactly what you are doing.
Thanks for the fixya rating, hope this helps
Posted on May 12, 2009
SOURCE: sony home theater model no
Check the speaker connection. One of them has a shortcircuit. Try to disconect all of them and power on the device. See what is happen. If starts corectly check the speaker cable. Conect one by one and power up the receiver after each connection. When you get the error again check the last conected cable. These receivers have a protection system against shortcircuits. That is puting your device in that error.
Posted on Jan 27, 2011
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