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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Sun Jun 03, 2012 10:17 pm Post subject: |
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| macgyver655 wrote: | I'm not seeing that connector number and I dont have time to look for it. I'm on my way out. The pins I gave you should of had +5v on it.
Lets try it this way. On the CPU board look for diode D203. DMM on DC and neg leed connected to CP553, pin 4. With the pos leed you should have +5v on 1 side of the diode and +5.6v on the other side. Let me know what you get. I'll check back in an hour. |
Hey I'm not alone  , it took me an hour to find it, lol. Ill check those out and post them, thanks Mac 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Sun Jun 03, 2012 10:39 pm Post subject: |
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Mac,
I found the ACTUAL CP3001, coming off the CPU board on the HDMI board (FM tuner was in the way), I tested Pins 4 and 5 and I get 5.05vdc.
I could not find D203, I saw D202, and IC202s location (IC202 is on the botom and the bottom of this unit is impossible to get to unless I tore it all apart) so if D203 is on the bottom of the board, thats going to be hard to get to if I have to have the unit powered up.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:00 am Post subject: |
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Dont bother trying to find that diode. You have the required +5v supply. Give me a sec for the next step.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:07 am Post subject: |
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Ok. We need to monitor the voltage of pin 20 of ic202 during start up and shutdown. So you will have to solder a wire either directly to pin 20 or a nearby pad off of pin 20 or R232 on the ic side, if that resistor is accessible. Your neg test leed will still be connected to CP553, pin 4.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 12:10 am Post subject: |
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Mac, R232 is accessable, what am I looking for when testing it?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:18 am Post subject: |
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| Jeremy112 wrote: | | Mac, R232 is accessable, what am I looking for when testing it? |
You need to solder a small wire to one side of that resistor and connect it to the pos leed of your DMM and see what your DC voltage is when you first turn on the receiver and when it shuts down.
To determine what side of the resistor set you DMM to ohm scale. 1 leed on ic202, pin 20. The other leed use to test R232. 1 side will read 1k ohm the other side will read 0 ohm. Solder your wire on the 0 ohm side. then connect it to your DMM pos and set it to DC scale and your neg leed to CP553, pin 4 as with the last test. You can solder a wire here also so you dont have to hold it during power up and shutdown. Give me the readings after the test.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 12:29 am Post subject: |
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| macgyver655 wrote: | | Jeremy112 wrote: | | Mac, R232 is accessable, what am I looking for when testing it? |
You need to solder a small wire to one side of that resistor and connect it to the pos leed of your DMM and see what your DC voltage is when you first turn on the receiver and when it shuts down.
To determine what side of the resistor set you DMM to ohm scale. 1 leed on ic202, pin 20. The other leed use to test R232. 1 side will read 1k ohm the other side will read 0 ohm. Solder your wire on the 0 ohm side. then connect it to your DMM pos and set it to DC scale and your neg leed to CP553, pin 4 as with the last test. You can solder a wire here also so you dont have to hold it during power up and shutdown. Give me the readings after the test. |
Mac,
IC202 is inaccessable unless I rip the receiver apart completely to get to it since its on the bottom of the board. I was able to test the voltages off of R232 and pin 4 on CP553 anyway, I tested both sides of the resistor on power on and I get 0.56vdc on both sides of the resistor with pos lead on it, and neg lead on CP553 pin 4
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:31 am Post subject: |
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Did that voltage change just before it shut down?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 12:34 am Post subject: |
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| macgyver655 wrote: | | Did that voltage change just before it shut down? |
no, infact it stays after shutdown while in standby
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:35 am Post subject: |
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Is R235 near that resistor?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 12:47 am Post subject: |
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Mac,
I cannot locate R235, so if it is near, its on the bottom side along with IC202... :-\
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:51 am Post subject: |
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Why do you believe it is going into protect mode. Does it say protect on the display or is the LED flashing after shutdown?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 12:53 am Post subject: |
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| macgyver655 wrote: | | Why do you believe it is going into protect mode. Does it say protect on the display or is the LED flashing after shutdown? |
When I turn the unit on, all appears normal, I hear relays clicking, and after the last click the display goes off, the front red LED starts blinking and doesnt stop until I press the standby/on button or the main power button
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 12:58 am Post subject: |
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Ok. As much as I like to stay on a specific path I guess we will have to jump around since some things are so hard to get at.
We are moving to the Main board, which is the amp board. I want you to locate 2 ICP's (those fuses that look like transistors) and test them for short. They are ic105 and ic106. Also test fuse F102.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 1:08 am Post subject: |
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I'm going to be signing off soon for the night so I'll give you the next step if everything tests ok on the last step.
On this same board locate TP101, TP102, TP103, TP104 and TP105. You need to test for voltage on each of these TP's, 1 at a time after turn on.
There should be 2 pads on each TP, 1 for pos leed and 1 for neg leed, with DMM on DC scale. Each one should read 0 volts. If it shuts down during testing these pads recheck the one it shutdown on during the next start cycle and continue from there.
If they all test ok then you need to locate the SB amp board. This is the amp board for the surround back speakers. There should be 2 TP's on this board, TP106 and TP107. Test these the same as the last. Should be 0 volts during and after turn on.
I'll check results in the morning.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 1:11 am Post subject: |
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Mac,
F102 is fine, IC105 reads 005 when off, when on it reads 012 when testing for short. IC106 reads 001 when off and 000 when on.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 1:11 am Post subject: |
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Oh, I almost forgot. Before testing these TP's try to set the volume to ---, mode to 7ch stereo and function to CD.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Jun 04, 2012 1:13 am Post subject: |
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| Jeremy112 wrote: | Mac,
F102 is fine, IC105 reads 005 when off, when on it reads 012 when testing for short. IC106 reads 001 when off and 000 when on. |
Your not testing voltage on these ICPs. DMM on diode scale and test like a fuse. Dont turn on for testing. receiver should be off.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 2:46 pm Post subject: |
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| macgyver655 wrote: | | Jeremy112 wrote: | Mac,
F102 is fine, IC105 reads 005 when off, when on it reads 012 when testing for short. IC106 reads 001 when off and 000 when on. |
Your not testing voltage on these ICPs. DMM on diode scale and test like a fuse. Dont turn on for testing. receiver should be off. |
I was not testing voltage on IC105 or IC106, I was testing for continuity only. As for testing the test points, luckily it was already on CD and volume was to a minimum, all the test points except TP102 were fine.
TP102 reads 114v when on, and about 50v when in standby.
Also on board labelled (AVR2307 CNT PCB) I dont know how, since I did not short anything out while testing... but Q504SBL and R511SBL did not survive... does TP102 interact with those parts on that board? Thats the only way I could see that I fried it since TP102 is right under the 2 large caps on the board with all the large output xistors
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Mon Jun 04, 2012 2:49 pm Post subject: |
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Also, after cooking those 2 parts on the CNT PCB 7020-06488-201-S1, I removed it, which allowed me to test TP102, it did not affect functionality even when it cooked.
I can replace the resistor on that board, but I need the number for Q504SBL since the face of it blew off :S
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