Replacing JVC Ballast - Page 4 - AVS Forum | Home Theater Discussions And Reviews
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post #91 of 103 Old 03-14-2019, 08:44 AM
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Originally Posted by MKIII View Post
In mine I had to get a new bulb once i replaced the ballast. It seems that any bulb, even brand new would would not work if it was connected to the old ballast.
That sounds unlikely, but I wouldn't know. I bought mine with the faulty ballast, and damaged from the trip when it would have the ballast repaired. Because of the damage, the owner decided not to repair the projector and sold it on eBay, without lamp (because the previous one had been damaged). The interior looks perfect to the naked eye. @Slonopot repaired the ballast for me, and I tested it again with a cheap lamp. Therefore, there's a good possibility that @Slonopot is correct that the lamp isn't good. He's sending me a bulb to test the projector. Although with all the damage to the outer shell I suspect I won't be that lucky.

Oh well, trying to cheat the system and get a high-end projector for cheap.
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post #92 of 103 Old 03-14-2019, 08:51 AM
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Originally Posted by MKIII View Post
I was given the projector (RS60) to fix. The original owner said he got an error, replaced the bulb with an OEM and it did not fix the error. Once I got the projector I replaced the ballast and the projector would not work with the old bulb (~800 hours) or the new one. Once I bought a new bulb the projector fired up. The new oem bulb that the original owner purchased could have been DOA.
I changed, repaired, more than 20 ballasts, probably 30 now, old lamps worked perfectly in 90% of cases.
Perhaps you have a case that is included in 10% of the unknown. Everything may be a technique too capricious.
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post #93 of 103 Old 03-14-2019, 08:53 AM
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Originally Posted by descalabro View Post
That sounds unlikely, but I wouldn't know. I bought mine with the faulty ballast, and damaged from the trip when it would have the ballast repaired. Because of the damage, the owner decided not to repair the projector and sold it on eBay, without lamp (because the previous one had been damaged). The interior looks perfect to the naked eye. @Slonopot repaired the ballast for me, and I tested it again with a cheap lamp. Therefore, there's a good possibility that @Slonopot is correct that the lamp isn't good. He's sending me a bulb to test the projector. Although with all the damage to the outer shell I suspect I won't be that lucky.

Oh well, trying to cheat the system and get a high-end projector for cheap.
The lamp is my gift, it does not need to be returned.
It is 100% workable, but there are some hours on it, about 1000.
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post #94 of 103 Old 03-14-2019, 08:59 AM
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Originally Posted by Slonopot View Post
The lamp is my gift, it does not need to be returned.
It is 100% workable, but there are some hours on it, about 1000.
I'm very grateful to you.

аплодисменты!
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post #95 of 103 Old 03-30-2019, 08:59 AM
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So, I received the bulb sent by @Slonopot . The connection was not exactly as the cheap lamp that I had, so I decided to solder it. My soldering iron is broken, so the solder was kind of a blob, but I think the wire had good contact (see photos in reverse order)

Unfortunately, the result is the same. Blinking orange light in the middle, other two lights just red.

Maybe it's time to sell this for parts. This has been an interesting experience, but not so gratifying.
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post #96 of 103 Old 05-10-2019, 05:17 PM
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I was able to get one from Encompass (https://www.encompassparts.com/item/...01/Ballast_Pwb). Shipped quickly and I was able to install it fine and get back up and running.
Thanks so much to Pat Young. I ordered a ballast PCB for my RS40U from the link above and it arrived in a few days. Exact JVC/Kenwood part and all!

As my projector is ceiling mounted, it was about a two day process to replace this board. **ZERO** thought process was put into the maintenance design of these projectors. That being said, the JVC Reference Series is the only thing I have found to exceed high end CRT projector performance. Brilliant picture once you get back up and running! Considering how much I paid for the projector when new, it was worth the effort. Thanks again Pat!
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post #97 of 103 Old 05-11-2019, 07:15 AM
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**ZERO** thought process was put into the maintenance design of these projectors.
After disassembling an X70 for the same purpose, I would say the same. It seems to me this is the work of engineers and that designers had no part in it, except for the plastic encasing. And while I have to admit these projectors are very complex, I can't avoid feeling there could have been more simple ways to assemble them. But I may be wrong.

Now, not to discourage you, but I've heard that even the replacement Ballast may suffer the same fate as the original one, and that a modification to it may be required. There's some info about this on this same thread.
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post #98 of 103 Old 05-11-2019, 08:14 AM
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Originally Posted by descalabro View Post
After disassembling an X70 for the same purpose, I would say the same. It seems to me this is the work of engineers and that designers had no part in it, except for the plastic encasing. And while I have to admit these projectors are very complex, I can't avoid feeling there could have been more simple ways to assemble them. But I may be wrong.

Now, not to discourage you, but I've heard that even the replacement Ballast may suffer the same fate as the original one, and that a modification to it may be required. There's some info about this on this same thread.
In this ballast, the inductance of the current is incorrect initially. Engineers have failed. Therefore, even replacing the ballas with a new one, it will still fail over time.
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post #99 of 103 Old 05-11-2019, 09:00 AM
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Originally Posted by Slonopot View Post
In this ballast, the inductance of the current is incorrect initially. Engineers have failed. Therefore, even replacing the ballas with a new one, it will still fail over time.
Probably what causes the lamps to dim and fail too soon from these models.
However note that I have gone through 7 lamps without any Ballast issues on an X3, never had to replace it in the first place though.

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post #100 of 103 Old 05-11-2019, 01:31 PM
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Originally Posted by Slonopot View Post
In this ballast, the inductance of the current is incorrect initially. Engineers have failed. Therefore, even replacing the ballas with a new one, it will still fail over time.
Do you offer repair service and also correct the inherent flaw? I have a X3 has been acting up a while, but recently its just completely given up. Id certainly prefer to have the ballast repaired and flaws corrected rather than buy a new unit which will fail again due to poor design/engineering. Please let me know if this is something you offer or can recommend where it can be correctly fixed. I appreciate it.
Thank you
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post #101 of 103 Old 05-11-2019, 09:34 PM
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Originally Posted by phtli View Post
Do you offer repair service and also correct the inherent flaw? I have a X3 has been acting up a while, but recently its just completely given up. Id certainly prefer to have the ballast repaired and flaws corrected rather than buy a new unit which will fail again due to poor design/engineering. Please let me know if this is something you offer or can recommend where it can be correctly fixed. I appreciate it.
Thank you
Yes, I correct bad ballasts.
Write me a private message, give the price and address
 
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post #102 of 103 Old 05-16-2019, 07:52 PM
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Originally Posted by descalabro View Post
After disassembling an X70 for the same purpose, I would say the same. It seems to me this is the work of engineers and that designers had no part in it, except for the plastic encasing. And while I have to admit these projectors are very complex, I can't avoid feeling there could have been more simple ways to assemble them. But I may be wrong.

Now, not to discourage you, but I've heard that even the replacement Ballast may suffer the same fate as the original one, and that a modification to it may be required. There's some info about this on this same thread.
Thanks, yeah I read through several threads recommending replacement of IC01? (bottom of PCB), a resistor feeding said IC, and some opto-couplers. Due to the length of time and effort to swap out the board I just bought a new board. The original board lasted several lamps and 6+ years in my theater. After another six years I will be ready for a 4k or 8k JVC.

Good luck to anyone replacing this board. Take plenty of time and be ready to label 20+ cables. 😁
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post #103 of 103 Old 05-16-2019, 11:18 PM
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Independently, the resistor can not fail, need a reason. As a rule, it is a transistor and a capacitor. But this is a rare failure of these ballasts.
Optocouplers almost never collapse.
 
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