Onkyo T-4150 tuner

SWDick · 19th August 2007, 05:55 PM

The display of the tuner doesn't display any more.
I measure about 14 V DC on the pins of the display.
As the tuner only has DC voltage levels of up to 18 V I suppose the supply voltage to the pins is all right.

Anyone experience with this problem?
Perhaps anyone with a service manual?

Thanks for you reply.

Netlist · 19th August 2007, 07:30 PM

I know older displays had that little light bulb behind them.
Not knowing the 4150, I can't tell if that would be your problem.
I recall an AKAi video with the same problem.
Somewhere in the power supply, close to the display, one had to change a few capacitors.

That's about all I can tell without schematic.

/Hugo

tvi · 19th August 2007, 08:37 PM

The display runs at 3.2V from a seperate winding on the transformer, this winding also runs the light above the power switch.

In the attached partial schematic, the relevant lines I have highlighted in red.

Hope this helps

Regards
James

tvi · 19th August 2007, 08:38 PM

This is where they connect to the display

SWDick · 20th August 2007, 11:14 PM

Hi TVI

Great! It certainly helps. One of the supply pins didn't connect well. I resoldered and the display gave light!
The voltage across pins 1 and 36 is 3.04 V AC.
I can now see what frequency I tune to.

The display is however still rather dim. 2 elements light at a proper level, all the others are dim (I can see it when the tuner is searching).
What should I measure on the other pins?

SWDick · 25th August 2007, 02:53 PM

I found the cause of the problem:
Besides a bad contact the voltage was too low.
I raised it to 3.5 V by putting a resistor in parallel to the one in the schematic.

Thanks a lot
Dick.

steve_pan · 18th December 2008, 08:11 AM

I have a simillar problem with my tuner.

Onkyo 9090 II , the display is dim ,

I could use some help

Thank you

tvi · 19th December 2008, 12:55 AM

Hope this helps

Regards
James

tvi · 19th December 2008, 12:59 AM

And this

Regards
James

steve_pan · 19th December 2008, 05:24 AM

Thank you James.

I have the original service manual for the 9090 II , do you think its the same problem ( contact on display pins )

I was thinking maybe due to age of the tuner its time to replace all the elec. capacitors , but i will inspect the pins first

19th August 2007, 05:55 PM	#1
SWDick diyAudio Member Join Date: Oct 2005	Onkyo T-4150 tuner The display of the tuner doesn't display any more. I measure about 14 V DC on the pins of the display. As the tuner only has DC voltage levels of up to 18 V I suppose the supply voltage to the pins is all right. Anyone experience with this problem? Perhaps anyone with a service manual? Thanks for you reply.

18th December 2008, 08:11 AM	#7
steve_pan diyAudio Member Join Date: Sep 2007	Onkyo 9090 II I have a simillar problem with my tuner. Onkyo 9090 II , the display is dim , I could use some help Thank you

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19th August 2007, 07:30 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	I know older displays had that little light bulb behind them. Not knowing the 4150, I can't tell if that would be your problem. I recall an AKAi video with the same problem. Somewhere in the power supply, close to the display, one had to change a few capacitors. That's about all I can tell without schematic. /Hugo

20th August 2007, 11:14 PM	#5
SWDick diyAudio Member Join Date: Oct 2005	Hi TVI Great! It certainly helps. One of the supply pins didn't connect well. I resoldered and the display gave light! The voltage across pins 1 and 36 is 3.04 V AC. I can now see what frequency I tune to. The display is however still rather dim. 2 elements light at a proper level, all the others are dim (I can see it when the tuner is searching). What should I measure on the other pins?

25th August 2007, 02:53 PM	#6
SWDick diyAudio Member Join Date: Oct 2005	I found the cause of the problem: Besides a bad contact the voltage was too low. I raised it to 3.5 V by putting a resistor in parallel to the one in the schematic. Thanks a lot Dick.

19th December 2008, 05:24 AM	#10
steve_pan diyAudio Member Join Date: Sep 2007	Thank you James. I have the original service manual for the 9090 II , do you think its the same problem ( contact on display pins ) I was thinking maybe due to age of the tuner its time to replace all the elec. capacitors , but i will inspect the pins first

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