correct - i don't have a scope.

I know on some of these other units the digital section was known for getting damaged due to heat and not switching HDMI. Mine didn't have BGA type processor and the connections looks fine however I was hoping that it would be something easy in the power amplifier stage.

Regardless, I think i've put too much time into fixing this and will throw it out. Best Buy has a Denon unit on sale that i'll go and buy tonight.

Hopefully Denon will last longer than this Onkyo/Pioneer.

Thanks again for all your help - much...

Thanks for finding that!

So based on DC on the speaker output, I am assuming I am correct in focusing on the amplifier section. As i've replaced the two main power transistors and still have an issue, where would you suggest that I focus on next? any specific component in the schematic above?

Hello Everyone,

I have an Onkyo TX-SR353 Audio/Video Receiver (5.1 ch with HDMI) that I am having a really hard time diagnosing and I'm about to throw this in the junk and go buy a new unit that is on sale until the 7th.

Symptoms:

• Intermittent (part of the reason why i'm having a hard time isolating problem), sometimes will work for 10+h at a time without issue
• Original symptom was wife reported loud banging noise (like someone was banging on the wall with their fists) from the LEFT SURROUND speaker and then the unit shut off.
• I swapped the Left and Right surround

...

Made some more progress tonight. I can confirm that my power supply board is not turning on the 5V Standby Signal. I don't have exact schematics (which is tough to trace this all out) but from what I deduce is this:

The 3BR2565JF power supply regulator is initially working and generating the 15v and 5v respectively on the cold side of the board.
The initial 5V signal (STBY-HEAD) feeds a MCV14A microcontroller
This microcontroller is getting 5V across the supply and ground
It appears this microcontroller has output pins to turn on the regular standby, relay, 15v and...

thanks for the quick reply! I did a "dirty" test of all the electrolytic caps on the board and they all seem to be fine, except for a couple, which i needed to take out of circuit for which i then tested on my LCR meter and they are within spec. Any other suggestions?

One more detail - the Power supply Part number is BN44-00442A however it appears it may also be model number BN44-00443A, BN44-00444A or BN44-00444D for various size of TVs and it appears they populate different components. In other words if someone has a schematic for any of these models it would be a big help.

Hello, I have a Samsung Plasma TV - Model # PN43D450A2D

This was my parents TV and the initial symptoms were that the display was hard to turn on with the display making various clicking noises until one day it would not turn on anymore.

I took a look and found a couple 1000uF capacitors (i believe on the low voltage size) that had leaked out their electrolyte and did not test well on a tester. I replaced them but still no dice.

When the TV is plugged in, there is no clicking, LED status lights (on PCB boards or the front display) and the power on button...