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KV-40XBR800 blow dryer method fix |
withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
 |  Posted: 2010-08-05 14:13
Howdy,
I've come across a KV-40XBR800 for sale in my area. This is a television I always wanted to own (but never wanted to carry). However, the current owner states that he needed to hit the backend with a blow dryer for a while before it will start. I've done some research on this and found that it is something of a common problem but I cannot find a repair linked to it. Is this actually some kind of humidity "fuse" preventing turn-on? Or is it actually some faulty part affected by humidity? Is it the commonly failing IC MCZ3001D on the D board? If not, is there a fix for it? Could I install an electrical cooling fan over the area in question? Any help is much appreciated.
Thanks in advance!
Alex Mason
[ This message was edited by: withalligators on 2010-08-05 14:14 ]
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Ironhead17
Rank: Sony Buff
Joined: Aug 01, 2010
Posts: 21
From: Elgin, SC
 | Posted: 2010-08-05 15:33
I believe you've contradicted yourself. I don't think it would be resolved by cooling the part that works occasionally by heating it. Spend some time reading BobF's post. You'll find your answer here I'm sure, just do your homework.
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withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
| Posted: 2010-08-05 16:49
I get what you are saying, and sure a heated element with a fan to dry an area would work better, but wouldn't a small fan on all the time the unit is on also move moisture off the part in question? Again, I'm only as familiar with the problem as I've been able to read about on teh interwebs, and I'm only suggesting ideas in hopes that someone with more knowledge will chime in. I will seek out this BobF post you speak to try and learn more.
Thanks,
Alex Mason
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Ironhead17
Rank: Sony Buff
Joined: Aug 01, 2010
Posts: 21
From: Elgin, SC
| Posted: 2010-08-05 21:01
Now, I'm no technician by any means, but I believe the hair dryer trick utilizes the heat to help the IC function properly.
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BobF
Rank: Sonyphile
Joined: Feb 17, 2004
Posts: 643
From:
 | Posted: 2010-08-06 13:01
Alex,
Yes, the hair dryer trick has been discussed previously. I think a temperature change can sometimes allow a marginal component to function properly.
A very common source of Sony power on problems is a failed or failing MCZ3001D IC. There are two of these on the D-Board of the KV-40XBR800 and many people have replaced these. I replaced two to fix my KV-36XBR400. Search this forum for "MCZ3001D" to learn all about this along with DIY tips. The ICs only cost about $6 each but there is soldering and desoldering involved.
Personally I wouldn't buy a KV-40XBR800 unless it was working perfectly. They are incredibly difficult to move and the blow dryer trick may stop workng at some point. These older CRT sets can often be found for dirt cheap prices so I would keep looking.
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withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
| Posted: 2010-08-06 13:55
Howdy again,
I've read up on the IC failure in the forums. From what I gather thats a seven or six blink code that usually illuminates that or something else on the D board? I got a message back from the seller saying it has six blinks, but I'm having them check again, and to see if it emits a different number after a pause. Also, this TV is so cheap it practically is free, which is the only reason I am considering it. Really, picking it up and moving it is going to be the hardest part. They seem to come up more and more infrequently for sale otherwise I would just wait. Provided there are no stairs to move it up or down, I think I will give it a shot, buy some sockets for the IC, and try to find some DB versions to pop in there. Unless I can be convinced to not bother. Otherwise I will update as help is needed or as status changes. Thanks,
Alex
Also, anyone know where there is a schematic, or is the board labeled well enough that I can follow the numerous tutorials?
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BobF
Rank: Sonyphile
Joined: Feb 17, 2004
Posts: 643
From:
| Posted: 2010-08-06 14:30
Alex,
If you haven't moved one these these TV before, be prepared for a shock. They are incredibly heavy and they are also awkward to lift. They are very "tube-heavy". My KV-36XBR400 only weighs about 220 pounds and just lifting it up into my entertainment center with another guy was a challenge. The KV-40XBR800 is about 300 pounds and you might need three fit people to lift it.
If you can't fix it you'll have to move it twice.
Practically free is great but be sure to factor in what your time and trouble are worth. I love to see these fantastic TV get rescued from landfills but just be sure that you know what you're getting into.
The blink codes only point to likely problems with the TV. So the problem could be something on the D-Board or even on another board.
The boards and the MCZ3001D ICs are labeled clearly so you won't need a schematic
Good luck!
Bob
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withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
| Posted: 2010-08-06 15:14
Bob,
That's what I was trying to get at. The TV is only 50 bucks, but it's an hour away. This means; 20 bucks or so in diesel in my pickup, plus 2 hours driving, who knows how long moving it (it took me 1.5 hours to move a 36fv300 100 feet and up into my truck by myself) out of the house, and another chunk of time getting it into my apartment (times 2 or 3 depending on how many guys I can take with me. Then taking it with me where ever I move. It is however, the largest CRT screen ever made, and of good quality (until you have problems). The more I think about it, the more I am apt to pass until one comes along that hasn't failed. It seems like these sonys either never have issues, or they have repeating problems. But it would make a heck of a monitor for a mame cabinet.
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BobF
Rank: Sonyphile
Joined: Feb 17, 2004
Posts: 643
From:
| Posted: 2010-08-06 22:26
Alex,
One particular problem to look out for with the KV-40XBR800 is a localized greenish discoloration in the picture. Search this forum and the internet for "green glob" or "green blob" for details
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withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
| Posted: 2010-08-07 01:47
Howdy again,
I know about the "practically unfixable" green blobs. This owner says the picture is immaculate. She even said that when she plugge it in to test how many blinks there were for me, it just turned right on and the screen was fine. It does sound like the IC unit from what I've read but who knows.
Thanks again,
Alex
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kex
Rank: Sony Fan
Joined: Sep 18, 2010
Posts: 2
From: Georgia, USA
 | Posted: 2010-09-18 11:31
I have had a 40XBR800 since 2003. Recently it started acting up by not turning on. We get six blinks of the standby LED. Sometimes there is 7 blinks. I have also seen 2 blinks and 4 blinks. BUT if we leave the unit unplugged for about 8-12 hours, it will turn on. At first, it would turn on after off overnight when I plugged it in. Now it will not turn on if I plug it in but will turn on soon after I push the power switch. When it has been on for a short time but gets turned off, it will not turn on again for 8-12 hours (though that's not exact.) Seems as though a capacitor gets charged up and won't discharge for hours. I don't think it's heat related because after leaving it unplugged overnight, I have tried to turn it on and then off again to see the diagnostics but it won't start a second time even if it was only on for a short while. After leaving it off overnight, I restarted it and have left it on for about a week now with no obvious deterioration in the picture or audio, and no blinking of the standby LED, no smells, no smoke. I did remove the batteries from the remote so no one (including me) would absent mindedly turn it off. We also run a Wii and Netflix with the XBR. The unit has been on a UPS (uninterruptible power supply) almost continually since we first bought it.
BTW, I just watched a PS3 repair video on youtube in which a ps3 was "repaired" with a heat gun. The author implied that the heat gun helps the solder to "reflow". The surface mount wave soldering I have seen involved the entire board floating on a lake of molten solder, so "reflowing" the solder with a heat gun seems unreliable at best.
My first XBR was a 27" that lasted 10 years. I sold it for $125 when I moved in 1995. I did not use a UPS on that TV.
[ This message was edited by: kex on 2010-09-18 11:43 ]
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BobF
Rank: Sonyphile
Joined: Feb 17, 2004
Posts: 643
From:
| Posted: 2010-09-18 14:56
kex,
My KV-36XBR400 had similar intermittent power up problems. Eventually, I couln't get it to turn on at all. In my case, The problem was due to one of the two MCZ3001D ICs on the D-Board.
There's a good chance that your 40XBR800 has the same problem.
Bob
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BobF
Rank: Sonyphile
Joined: Feb 17, 2004
Posts: 643
From:
| Posted: 2010-09-18 15:14
kex,
My KV-36XBR400 had similar intermittent power up problems. Eventually, I couln't get it to turn on at all. In my case, The problem was due to one of the two MCZ3001D ICs on the D-Board.
There's a good chance that your 40XBR800 has the same problem.
Bob
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withalligators
Rank: Sony Buff
Joined: Aug 05, 2010
Posts: 19
From: Baltimore
| Posted: 2010-09-18 19:35
Do what BobF says, it's a simple and cheap fix, and probably will solve the problem. If not, then you have not wasted much time or money.
Also, the PS3 heat gun fix is notorious for having a short life span, I wouldn't reccomend doing any of this to a TV. Search around on the forum, there is an excellent walkthrough by Bobf, Jehill, and sholliday.
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kex
Rank: Sony Fan
Joined: Sep 18, 2010
Posts: 2
From: Georgia, USA
| Posted: 2010-09-19 15:03
BobF, withalligators
Thanks for the input. If it dies on me, I'll try that solution but right now I'm not that desperate.
The heat gun solution is not acceptable but I may try it on a computer motherboard some day since I recently tossed a $180 motherboard with a bad south bridge chip. I'll check out the walkthrough, too.
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