Can you please send me the schematic for the EV700A (FCC ID: BEJCB775B...LG model). Thanks, most appreciated.
Email: warmacre@hotmail.com
Like a lot of others, I too suspect the FBT as the monitor has no raster, LED light is on but getting a tweet-tweet-tweet etc. and then the relay switches (possibly from high-voltage overload), LED momentarily goes out and the cycle begins over again.
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Sorry... it's a model EV700A FCC ID: BEJCB775B Manf. Date: April 2000... don't know if it makes a difference. Please send schematic to epro49@yahoo.com if you can. Thanks!
Gman
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I seen your message and was wondering if you still have the schematic available. I have been trying to find one and have been running into deadends. If you could send me a copy of the diagram, I would greatly appreciate it. Thanks Don
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Like a lot of other people, I am in need of a schematic for the EV700 monitor. I struck this site by accident. Hope ypu can help.
Thanks in advance
Allan
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My EV700 monitor is having the same symptoms as those posted in this forum. No picture but green power LED is on. The screen just went blank while I was working on it. Appreciate if you could email me the schematic for EV700. My email address is "tllye@avenue-capital.com" Thanks.
ps. any idea where the problem is? The SMPS or the HOT?
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Since my chassi has FCC: BEJCS780
the schematic somehow won't correspond to my monitor.
The thing is that I have a problem with some kind of spark-generator or something. Someone told me that it is used in cooperation with the capacitor next to it.
When I exchanged the capacitor and r. (which were totally burned out) I got almost the same problem.
The first problem was that the monitor made a strange sound which became louder and louder and then stopped. After the exchange of the components it now sounds like that for 1s and then nothing. In both cases the green light is on but there is no OSD or picture (the tube wont light up)..
Is the spark-thing supposed to leak sparks? When I look at it and start the monitor I can see multiple strong sparks like from a sparkplug. Is it supposed to be like that? Where can I buy such a thing?
And another thing while I'm at it. Where is the heater located?? This is my first repair of a monitor so I need some help :D
Regards
/RT
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Until now I've only worked with audio equipment and programming of small chips like the Atmel AVR-chips and I've also done some programming on Bosch LH fuel injection.
The other thing is that I come from Sweden so the names of the parts are different here than in english.. like the heater..
Any idea on the "spark-thing"?
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Hi there maybe 4 or 5 ot this type of thing usually around the FBT and on the CRT base board, if this is what you are refering to they are called spark gaps and are there for protection and only spark during CRT flashover or fault conditions.
What is the PCB ref for this item and what area is it in,
applogies if I upset you on last post
Rich
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I've now read a copuple of pages on computer monitors and also in general found out why this spark-gap is used..
And now I've also found out why the schematic wasn't corresponding to my monitor.. my monitor has the CA48 chassi not the CA65.. :D
Think I found the compnonents on one of my schematics here.. bad quality of the picture but it'll do..
The spark-gap is SG701 and the burned resistor and capacitor were R798 & C749..
I guess that the red dot on my picture is the SG.. got an image with better quality?
Here's the image:
My guess is that something is wrong with the signal from the FBT but I'll leave that one to you guys
/RT
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wooo... Started measuring a little and guess what? :D
What values should I have on B+ and pin1 (Vcp?)? When the monitor is on (green light on the front is lit) I get about 31V but if I measure it when starting the monitor I get values of 1500+V..
The signal at -120V is 0...
What is the GC pin at the FBT supposed to be? It reads 0 when the monitor is on and 1500+V when starting it..
Guess that's why the 300V SG keeps on sparking..
I also measured the pins at the PS? Different values were printed on the PCB but none of them except the 6,3V were correct.. got 60V at the 175V pin..
Any ideas? Seems like I have a lot of shorted circuits?? :/
I'll try to get another bad PCB to test components with..
Any ideas?
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Hi GC stands for Ground capacitor must be translation problem. It is the Gnd connection of a capacitor from the EHT it will be between 1 - 4nF when it is not connected to the CRT it may read higher when it is as the CRT will have at least 1nF capacitance.
Rich
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Hi do this way remove C749 and R798 and connect GC to gnd this way if the cap is faulty the unit will not power up rather than having 27KV across SG701.
Rich
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Came back now and started measuring a little.. one odd thing that I found was that there was a very low resistance (2kOhm) between the GC pin and the HV(red wire) connection.. All the other connections had a very big(infinite) resistance when measuring between the pins and the HV wire.. I read some texts about this and they all said that the resistance should be infinite on all pins and therefore there has to be something wrong with my FBT?
I'll get some thinner tomorrow so I can melt the glue or epoxy which is covering the inner parts of the FBT.
/RT
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Hi if you go back to my origional post I said that the FBT was duff and this monitor being an LG makes it even nore likely as LG's of this era suffer from FBT failure.
They appear in Apple, Tiny, Gateway and probably a lot more monitors.
Rich
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Guess you were right about the FBT from the beginning :D Everyone has to begin on the n00b level.. 10 years ago I didn't even know how to open the hood of a car.. today people ask me how to tune their engines for better performance..
I'm just hoping that the FBT didn't mess up that much on the PCB.. I'll get back when I've fixed the old one or got a new FBT..
/RT
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cathode heater(filiment). it glows orange in the rear of the tube neck. If the cathode does not get hot it will not emit electrons,and you will not have a picture or just a dim picture if it is not hot enough.(low voltage)
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I too would like to receive a copy of the schematic for the EV700A (chassis CA-65)(FCC ID# BEJCB775B) monitor made by LG Electronics. I fear that the FBT is bad. Can you tell my a good way to verify whether the FBT is defective or not? All the SMPS voltages are trying to come up, but are low. SMPS chirps about every 3 seconds. Power light is ON.
My email address is: fischrjr@aol.com
Thank you.
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Please send me the schematic for thr Gateway EV700, FCC ID: BEJCB775B, Chassis #CA65, P\N:7002089. My e-mail is prarieman4@yahoo.com, thank you very much!
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I have an EV700A that goes into sleep mode about 5 seconds after power up. If I remove power and reapply power it will not come back on. However if I let the power totally drain it will reproduce the previously explained post sequence. I assume this is a capacitor draining. This is my first monitor repair. Any help would be greatly appreciated. If I could get a schematic for this monitor it would help me a lot. My e-mail is general@ucomp.com Thank you in advance, Matt
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I have an EV700A CA65 monitor and the black text on desktop icons/word is a little blurry but uncomfortable to look at for a long period of time. colour is good and fairly bright display but with a slight green tinge
will the schematic show how to adjust these values to improve picture? focus/quality and if so please email it to lostplanetj@yahoo.co.uk
Any information on how to adjust picture/text quality will be very helpful.
Many thanks in advance
Jason
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On the FBT the black transformer in bacl left hand corner with thick red lead to the CRT.
You will find 2 controls, these are the horizontal and vertical Focus controls although their is some inter-activity between the two these will sharpen and degrade the Focus mark the positon with tipex etc before you start as this will enable you to get back to where you started from should you get totally lost.
Rich
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