Re: Pioneer VSX-1022-k No audio
Sorry to drag up an old post but did you ever solve the no audio issue with this amp or the other one you mentioned? I also have a very similar model with a very similar problem :|...
infrag
Senior Member
Last Activity: 06-14-2021, 07:33 PM
Joined: 06-23-2012
Location: australia
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Mate you need to take the back off the TV. Then the screws all around the edge tell the front plastic and frame pieces that the plastic face attaches to. Once removed you should look at the metal frame pieces that you've removed that touch the glass. The emi strip is attached to the metal....Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Well I have an update.
The replacement IC's came in. I soldered the chip in and turned the TV on. It worked!. I checked output voltage from the IC it was 8.5V. Then I turned the TV off.... and tried to turn it back on again. The relay clicked to turn on and then the TV turned off with the same blink code again. Bugger...
The other symptom is the IC does get hot while the TV is on.
Since I've tested most other parts in circuit I feel I'm chasing my tail.
I've done a non normal fix I guess and...Leave a comment:
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Re: Panasonic 50" VT20 arcing at edge of panel to frame
Well I have an update.
I bought some more new EMI strip (the first new strip was D shaped instead of flat)
All up cost me around $50-60.
Installed it and it works great!
There is now no difference in potential between the glass strip and the metal frame when the new EMI strip is making contact.
When I removed the old EMI strip i noticed that it seemed to have deteriorated such that the tape holding the strip down was not holding to the foam shielding very well. The strip came...Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
I was going to see if I could just download the eeprom from the A board just in case.
So did you get a clip with yours to clip onto the chip while its still soldered on the board?
Otherwise mine must have been too cheap and missed the whole clip idea......Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Hey do you have a guide to the CH341? I bought one recently and figured I might as well have a play around while I'm waiting for parts
Cheers...Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Ordered a couple of them just in case.
Thanks heaps.
I'd never heard of utsource.
Cheapest other one I found was the same price but postage was minimum of $30....Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
I dont mind to try desoldering/soldering the IC. However I'd like to find and order a backup one or 2 just in case and then try while the backup ones are on the way here.
The problem is I cant find anywhere to order the things to send to Australia
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Re: Panasonic 65" VT20 10 blink code
Bad board:
8.1k
Good :
9.3k...Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Anyone know where I can buy that IC?
MP2396ES
C0DBAYY00727Last edited by infrag; 03-19-2017, 05:38 AM.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Well I tried a bit more experimenting but everything seems OK.
If I put 8V on pin 2 output everything works. I do have to wait till the IC tries and fails to start itself otherwise it goes ballistic and starts outputting 14.5V which is dangerous I guess.
Anyway I turn the TV on... wait for the IC to try and start and give up. Then give it 8V from external powersupply. Everything is happy and hardly and power draw from the powersupply.
The IC voltages are then:
1. 0
2. 8
3....Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
OK I gave the bad board 0.1V on pin 5 again.
The voltages then are stable (for the brief moment I let it stay on as they are obviously wrong)
1. 0V (Ground)
2. 11.47V (too high should be 8V)
3. 15.4V
4. 3.3
5. 0.1V (I didnt check this pin if it ended up higher or not)
6. 0V
7. 5V
8. 15.89
The TV turns on like this but I dont want to leave it on with 11.47 instead of 8V.
I might see if I can make up a separate circuit from pin 5 to pin 2 as described in...Last edited by infrag; 03-19-2017, 12:31 AM.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
well it doesnt appear to be the diode. I've tested it and it appears OK. Tried a replacement and that does the same thing anyway.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Excuse my ignorance but is there a way to test the diode in circuit?
I realise I could check voltages on the pins when its on but since its only on for a split second before voltage drops how can I check this?
I've tried removing the diode from the board but its been a pig and I feel if i try anymore I'll wreck it.
I do have some non surface mount diodes lying around but I have no idea what specs they need to have if I had to replace it.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
I did my pin 5 test with my bad board. I couldn't at the time check the other voltage while I was doing this.
Thanks for the feedback. I'll check it now.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Well I've been a bit of a barbarian and tried my idea of putting some stable voltage on the input pin 5 (or what I assume it is from budwich's comment previously)
I tried with 0.6V but it didnt like that so i tried lower. I put 0.2V on it and tried turning the set on. Made a bit of a squeaky noise but the set did turn on!
So now I guess I should check why that voltage isnt stable on it own in circuit...Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Unfortunately I don't have an ESR meter yet. Its still on the way...
This means I can only check to see if the caps aren't shorted or have a guess at someone of them and hope I don't wreck them taking them off and back on again to check capacitance.
Basic checks there are no shorts there that I can see. Might be the other side of the board but so far I'm at a dead end.Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
The ? Means the voltage goes up for a split second and drops off before I can get a reading. My assumption is its because there is either a short or over voltage condition somewhere along the line. Or the ic is stuffed or both.
The earth pin I'll remeasure. The probe might not have been on 100% . I measured the pins before I knew what they were all meant to be...
As for the input pin idea I could cut the trace and put 0.8v on it like the other board or not a good idea?Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Checked all the test points. The 6v led point is the only one not coming through. Can't find the faulty part around it so I guess I'll have to assume its the IC? Can I bypass it put a separate 6v power supply on it to test?Leave a comment:
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Re: Panasonic 65" VT20 10 blink code
Double post
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