Re: Vizio E550i-b2e no standby voltage
That's what I was leaning towards. Well I will get one ordered and let you know it does. Thanks for your help. Got to learn somehow lol
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Re: Vizio E550i-b2e no standby voltage
Here is what voltages I have on that ic
Pin#
1. 1.074v
2. 5.837v
3. 0.423v
4. 0v
5. 0v
6. 0v
7. 2.418v
8. 15.3v
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Re: Vizio E550i-b2e no standby voltage
In standby mode it's 167vdc. Powered on its 167vdc also. Originally I didn't have standby voltage, but now I have that so on to the next problem. Sorry for the confusion.
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Re: Vizio E550i-b2e no standby voltage
Here is the datasheet....
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Re: Vizio E550i-b2e no standby voltage
Well I finally got the standby back. It was cold solder joints on that diode. However I moved on to the pfc circuit. It's not working. I have my vcc voltage and 2.9v on drive pin of ic going to gate of mosfet but I lose my voltage at a resistor any ideas.
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Re: Vizio E550i-b2e no standby voltage
Well my Bench power supply didn't get delivered. However when I got home I was messing with it and my standby would stay on for a couple minutes. Then if I unplugged it and waited a few minutes and plugged back in it would come back.
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Re: Vizio E550i-b2e no standby voltage
Ya I am going to try that when I get home. I will let you know my findings.
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Re: Vizio E550i-b2e no standby voltage
Ya I checked all the diodes in diode mode and suspected ones I unhooked one end. All was good. Lol that is what I was trying to figure out. That is the only the only thing that lit up. I think I will just change it out and see what happens.
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Re: Vizio E550i-b2e no standby voltage
The vcc is stable for the first 5 seconds then goes crazy after that.
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Re: Vizio E550i-b2e no standby voltage
It already is unplugged. I am just working on the smps.
Thanks
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Re: Vizio E550i-b2e no standby voltage
Well I checked the solder joints. Everything looked good. However I noticed when I first plug tv in I will get the standby voltage for about 5 seconds then it drops to 0 bit it is a gradual drop.
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Re: Vizio E550i-b2e no standby voltage
I replaced all together IC901, C907, C904B, C903, C901, Q800, andR804A
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Re: Vizio E550i-b2e no standby voltage
No everything checked good.
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Re: Vizio E550i-b2e no standby voltage
I know I can buy a new board, but now this is a pride factor I will not let a board beat me lol
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Re: Vizio E550i-b2e no standby voltage
You can see everything looks normal except for D901...
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Re: Vizio E550i-b2e no standby voltage
I have put 3 ics in so far same results. I had the 5v stand by and then gone and can't get back.
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Re: Vizio E550i-b2e no standby voltage
No everything looks good. From my understanding the ic takes current for the drain pins 7 and 8 and applies it to start the pwm then charges the cap for vcc. Then the aux winding is suppose to take over. However like I said the Vcc doesn't go over 14.5v and it needs 16 to turn on.
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Re: Vizio E550i-b2e no standby voltage
Ok thank you. I have 0volts on D950B.
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