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Post by tibimakai on Feb 20, 2017 3:36:05 GMT -5
IC903
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Post by mastertech on Feb 20, 2017 11:11:47 GMT -5
For ic903 I dont think it needs any programming. It should come ready to go. But you never know. So I can not say absolutely for sure.
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Post by tibimakai on Feb 21, 2017 22:41:25 GMT -5
I have just realized, that I have made a mistake. The new IC arrived and I have ordered the wrong IC, IC903. The shorted one, it was the IC9602, not IC903. I don't know, why I called it IC903. Now I need to order the right one: SII9387ACTUC.
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Post by mastertech on Feb 22, 2017 21:00:59 GMT -5
I do not believe that one needs any programming either.
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Post by tibimakai on Mar 30, 2017 23:56:37 GMT -5
Finally, I'm back.
HDMI IC soldered in, jumped the inductor for now.
There is 3.3V there, so that short is gone.
But, still won't boot up completely.
Shows Power on, than STBOX/CBL and other things light up on the display, than shuts off and MCAA LED start blinking.
I have measured the output of each amp, with the meter set at the mV scale, I was getting between 10-23mV DC.
What else should I check?
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Post by tibimakai on Apr 13, 2017 22:16:05 GMT -5
I have replaced the HDMI IC, but it did not change anything. Shows the input name and then shuts off, without any error.
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Post by tibimakai on Apr 17, 2017 22:15:50 GMT -5
I have measured the IC3004, at pin #80 for error and I measure 0.062V, without any change. That is normal?
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Post by tibimakai on Apr 18, 2017 19:29:16 GMT -5
Pin #71 is 4.84V. I'm not sure if that is good or not, because it is not specified. It seems low, no?
Same goes, for pin #80.
At pin #72, I'm getting 4.2V and it should be 5V (High) is normal.This is for Temp protection. This one seems even lower. It is not too low?
At pin #81, I'm getting 5V, which should be 5V (High) for normal. This one look OK. This is for Thermal protection.
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Post by mastertech on Apr 18, 2017 19:56:55 GMT -5
Pin 80 looks to be your problem. The other pins are most likely ok.
I would test for DC voltage at the base of Q527 on E board, base of Q530 on E board and base of Q14 on C board.
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Post by tibimakai on Apr 20, 2017 21:49:02 GMT -5
Q527 base= 0V
Q530 base= 0V
Q14 base= 0V
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Post by mastertech on Apr 20, 2017 22:20:20 GMT -5
Well that part looks ok.
You need to diode test for short between the emitter and collector of the following transistors:
Q527,Q525,Q530,Q528 on E board and Q14,Q16 on C board.
Also ohm test resistor R577 (22k) on E board and R3018 (220) and R3176 (470k) on H board.
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Post by tibimakai on Apr 23, 2017 18:26:07 GMT -5
I have some news, hopefully good. Q14 and Q16 are OK, and also R577(20.4Kohm).
Some of those transistors on the E board are not installed. Those, are probably used on the VSX60.
These are not instaled: Q525, Q528.
The other four, Q526, Q527, Q529 and Q530 seem shorted, between Base and Emitter(!).
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Post by mastertech on Apr 23, 2017 20:17:45 GMT -5
Only 1 of those transistors needs to be shorted and the others will also test shorted if you are testing in circuit. When the bad transistor(s) are removed your voltage at pin 80 should come up to normal. So start taking them out until the short is gone and then retest your voltage at pin 80. You do not have to wait for new parts to verify.
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Post by tibimakai on Apr 24, 2017 12:27:32 GMT -5
Thanks for all your help, you are great! Without your help, I would put it again on the shelf and I would forget about it.
I can't find that transistor, only an NTE2406 as a replacement. Which transistor could I use, to replace this one? Should I get the NTE from partsexpress?
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Post by mastertech on Apr 24, 2017 12:41:41 GMT -5
What did you find and which transistor are you looking for?
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