Pioneer VSX-1122K won't turn on

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

I have forgot to mention, that all this was measured with the receiver plugged in and was not turned on(reset).

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

This is the micro controller LC87F5NC8A, which is located on the front assembly.
Can anyone help me to check this IC, if it's any good? Specially the scope measurements(there are two waves in the SM at troubleshooting no power chart).
I can't get those results, no matter what I try with the scope.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

I'm thinking, that maybe the EEPROM is corrupted.
I'm wondering, which one is the EEPROM and what kind of software is on it, the firmware which can be downloaded from Pioneer?
There is a TSOP48 IC on the bottom of the HDMI board with this designation:
MX29LV640ETTI-70G
http://www.digikey.com/product-detai...104-ND/2744787
I don't see any 24C or 25C EEPROM on this Digital board(HDMI).
This part would contain the firmware?
There is a cheap MiniPro TL866 programmer, which it seems like it would support this IC. I would give it a try, if somebody would confirm my suspicion.
The whole board, is more then $500.

[mmartell]

Re: Pioneer VSX-1122K won't turn on

The 29LV640 is flash probably firmware. What makes you think you have eeprom corruption ?

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

It will show some life, only if I factory reset it.
It will show Power on and it's stuck there.
Otherwise, is completely dead.
Standby voltage is there, final transistors are all OK.

[mmartell]

Re: Pioneer VSX-1122K won't turn on

As you know these hdmi boards are complex, like the main board in a tv. Have you tried the simple hair dryer trick to rule out a bad solder joint ?

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

I will try hot and cold and I will let you know.
I don't know, how to isolate the problem.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

Did not help.
I could not do this, to the bottom part of the board though.

[mmartell]

Re: Pioneer VSX-1122K won't turn on

Sorry man I have nothing else for ya.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

I will try contacting Pioneer, to find out if they have an EEPROM for sale.
If not, then I will just have to wait, to pick up another receiver and then hopefully, I can find out, which board is the problem.
Thanks anyway.

[mastertech11]

Re: Pioneer VSX-1122K won't turn on

I responded to you on the other forum.

[mastertech11]

Re: Pioneer VSX-1122K won't turn on

Reply here: http://repairalmostanything.com/post/2465/thread

[mastertech11]

Re: Pioneer VSX-1122K won't turn on

Sorry, wrong link: http://repairalmostanything.com/post/2456/thread

[lukaszSZ999]

Re: Pioneer VSX-1122K won't turn on

Hi

Have You solved this problem? I have the same... Just only "POWER ON" after 10sec holding STANDBY button. No idea how to fix it.
Reply, please.

Best regards.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

No, but I still have it.

[Schmuru]

Re: Pioneer VSX-1122K won't turn on

Have you checked the primary side of your power transformer? The thermal fuse inside the transformer may have opened. I just repaired two 819H's that had that problem. I was lucky that I was able to dig the fuse out. I used a 130 degree Celsius replacement.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

On my own, I have voltages on the boards, so it is not from the transformer.
I have done that fuse repair once, myself as well.

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

I'm back to look at this receiver again.
I have removed the amp and measured the voltage regulators 12V, 5V, -5V at the middle bottom of the receiver and the voltages are there. Also the 5.6V coming from the power supply is there.
I have started to measure voltage regulators on D main board and some of them are there, but I have found a voltage that is not all there. It sould be 3.3V and I'm measuring 0.5V. There is almost a short(1.6Ohm), between the output and ground pins. IC9520, page 88 (BD9328CN) V+3V3_HHH.
I have removed the IC, but the short is still there. I have checked the nearby components and they all look good. My question is, how do I find the shorted component?
The receiver's MCAA LED, starts blinking as soon as I plug it in. If a I hold down the Tune- and Control Multi Zone Off buttons, at the same time, it will try to start(shows Power On) and in a couple of seconds, it will shut off and the MCAA LED will start blinking again.

[Packard93]

Re: Pioneer VSX-1122K won't turn on

iF U got a bad compacitor in circuit or u got an open in circuit dropping current. Is the protection circuit active ?

[tibimakai]

Re: Pioneer VSX-1122K won't turn on

The protection circuit it was on(MCAA led blinking), but as I said in your thread, I started disconnecting connectors and the only connector left, it was the front boards with the wide ribbon cable and the 5.6V power cable.
So, I have made the decision, to remove the HDMI board and the power board.
After that, I don't know what happened, the MCAA led did not turn on again.
I have made sure, that nothing is shorted out.
I don't know now, what could be the problem.