Re: Spectroniq PLTV-3250 wont start
The original 33 uF cap was a Capxon GL. I know Capxon are all pretty much crap.
If I trace the O/F pin, it appears to first go through jumper J4 then to resistor RS35. That resistor goes to the spot on the back of the board between "QS4" and "CS6" labels. From there, it seems to go through DS6 and CS15 (capacitor is across the diode?). Then it goes through RS27 (which tests good). From there seems to go to NTSC1, which is on the front of the board. From there, goes through jumper J7, where it then splits....
user_007
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Last Activity: 05-19-2012, 10:36 PM
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Re: Spectroniq PLTV-3250 wont start
Here are some views that show the legends for the connectors.
I'm getting voltage between the 5Vs and GND, as already stated. If I plug in the set and try to turn it on, I get 3.3V between the O/F pin and GND for a short time. I believe this is the signal from the main board trying to switch on the supply, as you mentioned. This tells me that the main board is working fine, correct, and it's the PSU not starting?
Thanks....Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Put in the new cap from RadioShack, no change. Still getting 5v standby, but no 16 or 24v.
ESR of the RS cap is about 0.9 ohms. It's a 50V cap.Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Sorry about that, was just a picture I found from Google images of the chart I was looking at. I'll be sure to upload all of my pictures as attachments.
Anyway, I found a 33 uf cap in a multipack at RadioShack - I'm sure they're not the highest quality caps, but seeing as how I was able to get it tonight, I figure I'll give it a try. Will let you know if it helps.
Thanks again for all the help.Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Hmm, then I guess it is bad ESR? I was using the chart on the front of my meter, in which the ESR doesn't seem out of the ordinary.
[url]http://img522.*************/img522/4056/sd530057yq6.jpg[/url]
So you would think that cap could be bad?Re: Spectroniq PLTV-3250 wont start<...<br /> <br />Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Here are some pictures of both sides of the board. There is definitely what appears to be discoloration from heat on both sides of the board near Q4. I popped Q4 out of circuit and checked it with the diode check setting on my DMM, and there were no shorts.
Also tested ZD3 and it appears fine.
The area around Q7/ZD4/C33 is a bit messy. Q7 is now a MPS2222a. The solder pad on C33 came loose as I was desoldering it (carefully too, didn't think I had too much heat), so I traced the route along the board and jumped it...Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Thanks for your response. Will post pictures shortly.Leave a comment:
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Re: Spectroniq PLTV-3250 wont start
Bumping this thread...hopefully someone can help me?
I picked up this TV with a bad PSU. Opened it up and saw 3 bulging capacitors. Replaced those, ESR tested the others and found another bad one, replaced it as well.
Had no standby voltage.
I read through this thread and other sites, and saw about ZD4 and Q7. Tested ZD4, and sure enough, it had continuity in both directions. Replaced it, but still no luck. Next, replaced Q7 with a 2222 (not surface mount style, but managed to get it to fit).
...Leave a comment:
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