Searching here the only similar thread I found is over 7 years old, hence starting this new thread.
I have 2 non-working JVR VCRs I bought new last century, HR-VP638U the older, HR-S7500U the newer. The older will turn on, but rejects tapes. It's PS section appears to be highly similar to that of the other thread, even though the shield blocks as much view as it does. Mine has no apparent evidence of excess heat. The newer is vaguely similar, but with no heat shield, big 68k resistor I see no correspondence to in the other two machines, and evidence of overheating in the darkened color of the board. I tried to get a picture that shows it better, but in all attempts either the flash burned it away, or reflections and shadows masked it.
The newer turns on, but immediately goes into auto search mode for several minutes every time, after which it shuts off. This seems to be the third most common problem described in a SMPS FAQ I read, where it says caps are highly likely the problem. The heat evidence in the area logically makes me agree, particularly since the 150uf 200v Samsung SSL is only 85° rated, but also knowing how cheap the manufacturers of VCRs had gotten by the time it was made in 1999, and my usage, leaving it on always (except when a timer recording turned it off while I wasn't around to notice) for the 44 months it did work.
Before I tear into it, I'd like to know what that Panasonic K2324 chip with the heat sink is. My brother told me silicon controlled rectifier, but I've been unable to confirm that via picture anywhere. Searching the numbers on the part was nothing but abject failure. Searching his description on Digi-Key produces too many parts without pictures to be useful, as all Google hits. Can someone here confirm, or tell me what it is, and how to convert its numbers into a replacement part number? Even if it is a SCR, wouldn't that be a part that only has two states, working, or not working? IOW, is there any point in changing it while doing cap replacement, since I have to order whatever caps it needs anyway?
Do those LXV caps appear to be PS section as well, 820uf 16v & 1200uf 10v? Next biggest near them are 220uf 16v and 220uf 10v. Elsewhere the biggest are 2200uf 6.3v and (2) 470uf 16v. Nothing else is bigger than 6.3mm by 11mm. Which should I actually exercise my new ESR meter on?
BTW, the reason I want to fix this is I made hundreds of tapes with it from which I want to make DVDs, and they mostly play poorly on every VCR I've since tried playing them on, having recorded using its proprietary extended audio mode.
BTW2, my first ESR meter and rework station are due here tomorrow.
BTW3, a local electronics repair shop I frequented at the time it broke 11 years ago, one of only two I ever got recommendations for, wanted to charge $255+tax to replace its mainboard instead of figuring out what actually went wrong with it and try to fix it.
Thanks for reading.
I have 2 non-working JVR VCRs I bought new last century, HR-VP638U the older, HR-S7500U the newer. The older will turn on, but rejects tapes. It's PS section appears to be highly similar to that of the other thread, even though the shield blocks as much view as it does. Mine has no apparent evidence of excess heat. The newer is vaguely similar, but with no heat shield, big 68k resistor I see no correspondence to in the other two machines, and evidence of overheating in the darkened color of the board. I tried to get a picture that shows it better, but in all attempts either the flash burned it away, or reflections and shadows masked it.
The newer turns on, but immediately goes into auto search mode for several minutes every time, after which it shuts off. This seems to be the third most common problem described in a SMPS FAQ I read, where it says caps are highly likely the problem. The heat evidence in the area logically makes me agree, particularly since the 150uf 200v Samsung SSL is only 85° rated, but also knowing how cheap the manufacturers of VCRs had gotten by the time it was made in 1999, and my usage, leaving it on always (except when a timer recording turned it off while I wasn't around to notice) for the 44 months it did work.
Before I tear into it, I'd like to know what that Panasonic K2324 chip with the heat sink is. My brother told me silicon controlled rectifier, but I've been unable to confirm that via picture anywhere. Searching the numbers on the part was nothing but abject failure. Searching his description on Digi-Key produces too many parts without pictures to be useful, as all Google hits. Can someone here confirm, or tell me what it is, and how to convert its numbers into a replacement part number? Even if it is a SCR, wouldn't that be a part that only has two states, working, or not working? IOW, is there any point in changing it while doing cap replacement, since I have to order whatever caps it needs anyway?
Do those LXV caps appear to be PS section as well, 820uf 16v & 1200uf 10v? Next biggest near them are 220uf 16v and 220uf 10v. Elsewhere the biggest are 2200uf 6.3v and (2) 470uf 16v. Nothing else is bigger than 6.3mm by 11mm. Which should I actually exercise my new ESR meter on?
BTW, the reason I want to fix this is I made hundreds of tapes with it from which I want to make DVDs, and they mostly play poorly on every VCR I've since tried playing them on, having recorded using its proprietary extended audio mode.
BTW2, my first ESR meter and rework station are due here tomorrow.
BTW3, a local electronics repair shop I frequented at the time it broke 11 years ago, one of only two I ever got recommendations for, wanted to charge $255+tax to replace its mainboard instead of figuring out what actually went wrong with it and try to fix it.
Thanks for reading.
Attached Files
I went through the upload process for 7 pictures before starting to write thread post #5, and in that post referred specifically to one of them by viewport position. Where those first 7 pix actually went I don't know, but I didn't notice they escaped until I read #8. 
This site frustrates the attach process the way it thinks it has any need or right to open new windows in my tabbed (preferred) browser, which I set to force opening new windows in same tab to keep the fwd/back path unbroken. Apparently I have to change settings or use a non-preferred browser for the process here to succeed.
That's actually not much of a surprise, as I had had the front off several times for tape extraction, and the machine had been in the shop multiple times before becoming useless. Now since the complete breakage, it wouldn't surprise me if this ribbon already had one or more broken connectors already, and was the actual problem causing the shutdowns. 
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