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#1
12-13-2007, 07:08 PM
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Sorry to ask you guys a computer question again...
I know this isn't a computer monitor forum, and I've asked questions of this nature before, so I apologize. My computer monitor is a 19" Sony CPD-420GS. I picked it up at the Salvation Army a few months ago for $10. The tube is in good shape, but this monitor has a personality of its own. Like most old Trinitron computer monitors, it takes a few minutes to fully warm up, however this one usually looks like crap for about 30 minutes before everything looks good. However, sometimes I turn it on and the quality is excellent in under a minute. Sometimes, it looks like crap all day. Sometimes, it starts good and then gets crappy.
When it looks good, the white balance is a little more blue-tinted and picture looks very bright, crisp, and clear. When it looks like crap, the white balance is more reddish and it looks OK, but only mediocre at best. That's not the problem I have with it right now, but I'd love to know what you guys think about that. The main problem I'm having right now is that the monitor lost Horizontal. I was using it earlier today when the screen kinda flinched a few times and then it turned into a very bright, vertical line going down the middle. I said a few choice words, then instantly hit the power button to avoid burn-in. Can you guys tell me what causes a loss of Horizontal, and where to start/what to check? I really want to get this monitor going again. When I turn on the monitor, it degausses and then the power light starts blinking yellow. I'd also appreciate it if you guys would tell me what you think about how sometimes it looks great, but usually it looks kinda crappy. It's not the tube getting weak, because sometimes it look great right off the bat without taking long at all to warm up. Do you guys think there's bad caps in there? I've noticed the neck board smells like urine and there's a (12-pin I believe) IC right above the socket. The PCB area around the IC looks very burnt and brown. I will post pictures, the exact number of pins on the IC, and the number off the IC tomorrow when I get the chance to crack it open and take a look. Sorry for posting this in the vintage section, but this is the greatest electronics repair forum I have ever found online. Everyone here is really knowledgeable and kind, I've been searching but haven't been able to find another community as good as this one. I've asked questions about this monitor before on other so-called "electronics" forums but nobody ever replies. Thanks, -karmaman 
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#2
12-13-2007, 07:12 PM
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Time for a visit to the thrift store again. Monitor with CRTs are a dime a dozen any more.
__________________
Sansui G6000,7070 Pioneer SX1250,SX1280 Kenwood KR-8010 Onkyo TX8500II Pioneer CTF950,Akai GX-S80 DCM TF-600,TF-400 CX-17+ KL Quartets
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#3
12-13-2007, 07:23 PM
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Of course, that's what I thought too, except my mom freaked out as soon as I told her I was off to the thrift shop. "You're not bringing any more crap in here, you already have like 5 screens in your room". Aaargh! I'd just go find another Trinitron but that's not an option, my parents want me to save up and get an LCD.... screw that! I don't like LCD's, nothing beats a Trinitron IMO. I don't know why my mom gets so pissed that I have a bunch of electronics laying around. I offered to throw away the old Trinitron and get a new one but she said no.
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#4
12-13-2007, 08:31 PM
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http://www.eserviceinfo.com appears to have a service manual for your monitor.
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#5
12-13-2007, 08:34 PM
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Just sneak one home
 ....I do that often enough with other equipment.  ...parents never know.....
__________________
Denon, Mackie, Lenco, JBL, Onkyo, Crown, Tascam, Teac, Otari, Ampex, Pro-Ject, Kenwood, Technics, Sound Engineering Labs, Apple, PreSonus, Panasonic, Shure, Realistic and JVC spoken here
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#6
12-13-2007, 08:44 PM
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Quote:
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Kevin
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#7
12-13-2007, 08:53 PM
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Go for the service manual karmaman. Good Luck!
 Quote:
Don't be so sure. 
__________________
 Nothing outside you can ever give you what you're looking for. I'm gone fishing... see you at the pond.
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#8
12-13-2007, 08:59 PM
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Quote:
We kids are GOOD at hiding stuff that will never be noticed!
__________________
Denon, Mackie, Lenco, JBL, Onkyo, Crown, Tascam, Teac, Otari, Ampex, Pro-Ject, Kenwood, Technics, Sound Engineering Labs, Apple, PreSonus, Panasonic, Shure, Realistic and JVC spoken here
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#9
12-13-2007, 09:48 PM
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Quote:
__________________
Nothing outside you can ever give you what you're looking for. I'm gone fishing... see you at the pond.
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#10
12-13-2007, 11:20 PM
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I caught flack from time to time from my parents for having too much junk here. But, my Mother would always tell people "at least I know where he is when he's got his head stuck in a radio or TV". I remember my Dad telling me once to clean my room and all I did was shove everything under the bed. He went in there and pulled everything back out and gave me a good tongue lashing and the cleaning of my room turned into an all day project.
I don't know about the monitor; but, I've seen a few Sony TV's with crappy pictures that were caused by loose connections on the CRT socket board. It was usually the socket itself. As far as no horizontal deflection; I'd look at the horizontal output and horizontal yoke return circuit. There's probably a cap or resistor that has given up. Look for any capacitors that are cracked, swollen, or burned looking. These HV caps are usually blue, brown, or yellow in color.
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#11
12-14-2007, 12:32 AM
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Thanks for the replies everyone, I'm going to spend some quality time with this monitor tomorrow, test every cap I can and all the resistors too. The service manual looks like it will be very, very helpful, but I'm not even going to try and read it until I get to the library tomorrow and print the whole thing (51 Pages!). I feel really old saying this (no offense) but I don't like reading books/manuals/things of that nature on a computer screen..... can't stand it. It needs to be on paper for me to comprehend and understand it fully.
I would save up and get an LCD, but it's going to be at least 4 months before I can come up with the money to buy a decent one, and I want my huge monitor back ASAP. Plus all LCD's are chintzy, plasticy POS's IMO. Flimsy plastic stands and "Made In China" plastered all over the place. I was helping the computer guy at my school unpack some very nice new Dells, since the school is starting to replace all our old computers. I unboxed at least 30 LCD's and they felt so weak, you pushed the plastic on the back and it bent it.... on $200 monitors? That's unacceptable. They were 19" UltraSharps, which run about $230 each. My Trinitron on the other hand was made at the Sony Rancho Bernardo plant, 30 minutes away from where I live. It's a solid, heavy beast. The plastic is thick and heavy, you can treat it as roughly as you want without even remotely caring about damaging it, because you can't. They don't make quality like this anymore. Any thoughts about why the neck board smells like urine? It's a foul smell that can only be described as urine, but I know for a fact it's not actually urine because it's JUST the neck board and the insides of the monitor were very clean, not even that much dust on the chassis. The only thing I can think of is that IC that has charred the PCB around it. Bad caps maybe? Last time I was in the monitor, about a week ago, I looked around for swelled/leaking caps, but found none. I guess this is going to take more than a visual inspection. Tomorrow I will search for bad resistors and resolder the entire chassis, see if that leads anywhere. The bad thing about this monitor is that I tried testing the caps on it with my multimeter, and they ALL read open. I'm going to have to remove them to get readings off them.... lots of work. I might buy a desoldering iron for this.
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#12
12-14-2007, 12:41 AM
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My HP 15" cheapo LCD has 16732 hours on it, and it still works fine. Never had a problem with it. had it about 2.5 years.
__________________
Denon, Mackie, Lenco, JBL, Onkyo, Crown, Tascam, Teac, Otari, Ampex, Pro-Ject, Kenwood, Technics, Sound Engineering Labs, Apple, PreSonus, Panasonic, Shure, Realistic and JVC spoken here
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#14
12-14-2007, 12:56 AM
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I have to agree with you. All of mine died, and I needed the desk space, that's why I didn't get a new one.
__________________
Denon, Mackie, Lenco, JBL, Onkyo, Crown, Tascam, Teac, Otari, Ampex, Pro-Ject, Kenwood, Technics, Sound Engineering Labs, Apple, PreSonus, Panasonic, Shure, Realistic and JVC spoken here
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#15
12-14-2007, 12:57 AM
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Try craigslist. I sold a Dell Trinitron 21" for $35 in 15 minutes. The picture was faded a bit but the buyer didn't care. I put that toward a new flat screen monitor. The reason I sold it is because I use my computer as the TV and when I moved the HT subwoofer under the monitor during a rearrange, the magnet caused major screen distortion. LCDs are unnaffected by this so I sprang for a 22" from costo and love it. I believe 17" ones can be had under $200 and a little larger isn't a whole lot more if you shop around. Also they draw 1/3 the electricty of a tube monitor which will eventually show up as a small but real savings on your electric bill.
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