Help! V deflection issues with Olympus OEV203 - Sony PVM-2M

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HermanMunster
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Joined: Sat Apr 18, 2020 10:45 am

Help! V deflection issues with Olympus OEV203 - Sony PVM-2M

Post by HermanMunster »

Last week I bought my Olympus OEV203. The unit was in pretty good shape and working great, it is from one of the last production years; October 2003.

However, yesterday I tried to hook up an RGB-modded NES console with a bad 72 pin connector to try to see if it worked. Bad mistake, now I have a vertical collapse on my PVM. I connected and disconnected the NES console several times through the RGB input. I think that I might have made a fatal mistake; I disconnected it and re-connected it while both the console and monitor were turned on. Right after that I heard a strange "t" sound. I turned it off, then went to try it with a different console, and got a vertical collapse on the screen. I think that something might have shorted out while I was connecting and reconnecting the consoles Here are pictures of before and after the vertical collapse:

https://ibb.co/HCJJn38

https://ibb.co/tLVNxVW

I spent a couple of hours last night going through the service manual trying to figure out this thing. It looks like the IC that controls the vertical and horizontal deflection is the IC507 which has a part number of NEC UPC1377C. I ordered a NOS replacement online from an out of state store that had only one left. The IC might still be good but it doesn't hurt to have a replacement on hand because these things are never coming back!

There is one 12v voltage regulator labeled IC505 which feeds the vertical part of the IC507 chip. The horizontal part seems to be fed by 115V. I located the 12v regulator and it doesn't even have a heat sink. Could it be that this regulator just broke? The part number is XRA17812T, which was originally manufactured by Sony but no longer available. Is a L7812CV a good replacement for this regulator? Could this voltage regulator be the culprit? How can I quickly test this without starting to take the whole thing apart?

I read on another forum from a person who had the same issue and got it fixed by replacing the flyback. I know that the 15v line that feeds the IC505 voltage regulator comes from the flyback. That person said that his monitor was dropped and that this caused the flyback to break. Is there a possibility that my flyback is broken? how can I test this?

Here is a list of the parts that I have been able to identify. Maybe should I just buy all of these components and replace them all? Any tests that I could perform to identify the issue?

https://ibb.co/sPNNNGF

Thank you so much in advance for any advice that you can give me!!
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

Nothing? Nada? Nichts?
jd213
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Location: Pennsylvania

Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by jd213 »

Not sure, but I get the feeling that a sudden failure like that wouldn't be from a flyback failure. Probably some other component. Have you checked if there's any arcing or anything going on?

Maybe try testing components like resistors and voltage regulators with a multimeter and component tester. Might be a good idea to make sure voltages and scope readings are correct, but board access might be a bit difficult with that monitor.

My OEV 143 had a bad film cap (wasn't causing vertical collapse though), so just goes to show you that all kinds of components can go bad.
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

Hi, thanks for your message! That is really a relief. My biggest fear was really the flyback being broken because they are pretty hard to find for this pvm model. I think that I can troubleshoot the issue and find out where it is. My suspicion is that either the 10ohm resistor on the 12v line feeding IC507, or the 0.68 ohm resistor on the 15v line feeding the voltage regulator, or the voltage regulator itself broke. After finding the issue I will not only replace the broken components with beefier ones, but will also replace all capacitors with 10k hour life capacitors. I think that it is worthwile for extending the life of the monitor for as long as possible. I just got an offer from the guy who sold me this monitor to buy another one (year 1998) at a very low price. I think that I am going to pull the trigger on that one as well.
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

jd213 wrote:Not sure, but I get the feeling that a sudden failure like that wouldn't be from a flyback failure. Probably some other component. Have you checked if there's any arcing or anything going on?

Maybe try testing components like resistors and voltage regulators with a multimeter and component tester. Might be a good idea to make sure voltages and scope readings are correct, but board access might be a bit difficult with that monitor.

My OEV 143 had a bad film cap (wasn't causing vertical collapse though), so just goes to show you that all kinds of components can go bad.
Btw, how did you realize that a film capacitor was bad? I did not know that they could go bad like that.
jd213
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by jd213 »

MKL helped me figure it out: https://shmups.system11.org/viewtopic.p ... 9#p1484049
Not sure how he knew I should measure resistance from specific points like that, but he seems to be a pro with far more experience than me.
DejahThoris
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by DejahThoris »

They absolutely can go bad. You can test them with an LCR meter out of circuit just like any electrolytic cap.

https://www.amazon.com/gp/product/B071W ... UTF8&psc=1

What have you done to confirm your suspicions? Have you pulled and tested those resistors / voltage regulator?
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

jd213 wrote:MKL helped me figure it out: https://shmups.system11.org/viewtopic.p ... 9#p1484049
Not sure how he knew I should measure resistance from specific points like that, but he seems to be a pro with far more experience than me.
Thanks! That is an interesting thread and I will read through it. My suspicion of the voltage regulator being broken comes after reading that most of the reliability issues with series M PVMs are because of failing capacitors or voltage regulators. I do have a multimeter, but did not know that I could test conponents without removing them. I have not performed any tests yet though; as much as I would love to just start working on fixing the issue, I am currently studying for an important exam that I have next week, so the PVM will need to wait until the following weekend. I know that even if my intention is just to do some tests, if I get started I will not leave it alone until I fix the issue lol!
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

And also, I think that only two things could be causing the issue; either IC507 is not getting 12v, or IC507 is broken. Those are the only two possibilities for vertical collapse as far as I know. Or is there anything else that could be causing it?
MKL
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by MKL »

A failure in the vertical deflection circuit (Q512/513/515) is more likely than a bad IC507. If you want to ascertain that the vertical part of IC507 is getting 12V, put the meter on R592 and see. I recommend to put croc clips on the probes and attach them to the parts you want to measure before powering the monitor instead of holding the probes with your hands which could lead to further trouble. Something like this:

https://it.aliexpress.com/item/40001732 ... pt=glo2ita

The heat sink of the horizontal output transistor (Q501) is a good point for ground and R592 is raised from the board so you can attach the clip to its leg easily (red arrow, ignore other arrows):

https://i.imgur.com/9IMOV0Z.jpg

After you see that 12V is present you can move on to the area that is more likely to be faulty. The first step is to check that the circuit is getting power. There are two supplies, one for the scanning period (24V) and another for the flyback period (50V or so). Keep using the croc clip method (ground point same as above):

https://i.imgur.com/8JxXuDQ.jpg

If there's no voltage check if R535 (and R541) is good or open (very low resistance across it, no need to desolder it). Both are behind the flyback transformer.
HermanMunster
Posts: 44
Joined: Sat Apr 18, 2020 10:45 am

Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

MKL wrote:A failure in the vertical deflection circuit (Q512/513/515) is more likely than a bad IC507. If you want to ascertain that the vertical part of IC507 is getting 12V, put the meter on R592 and see. I recommend to put croc clips on the probes and attach them to the parts you want to measure before powering the monitor instead of holding the probes with your hands which could lead to further trouble. Something like this:

https://it.aliexpress.com/item/40001732 ... pt=glo2ita

The heat sink of the horizontal output transistor (Q501) is a good point for ground and R592 is raised from the board so you can attach the clip to its leg easily (red arrow, ignore other arrows):

https://i.imgur.com/9IMOV0Z.jpg

After you see that 12V is present you can move on to the area that is more likely to be faulty. The first step is to check that the circuit is getting power. There are two supplies, one for the scanning period (24V) and another for the flyback period (50V or so). Keep using the croc clip method (ground point same as above):

https://i.imgur.com/8JxXuDQ.jpg

If there's no voltage check if R535 (and R541) is good or open (very low resistance across it, no need to desolder it). Both are behind the flyback transformer.
Thank you! This is extremely good advice! Yes, I think that I was mistakenly thinking that any issues would be limited to the 12v power line. I did not really understand the part of the two supplies, scanning period and flyback period. Where exactly on the board should I measure/test these voltages? Where is the vertical circuit located? This weekend I will check to see if 12v line has power. Btw how do I know If any of the transistors is broken? Thanks again!
HermanMunster
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Joined: Sat Apr 18, 2020 10:45 am

Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

HermanMunster wrote:
MKL wrote:A failure in the vertical deflection circuit (Q512/513/515) is more likely than a bad IC507. If you want to ascertain that the vertical part of IC507 is getting 12V, put the meter on R592 and see. I recommend to put croc clips on the probes and attach them to the parts you want to measure before powering the monitor instead of holding the probes with your hands which could lead to further trouble. Something like this:

https://it.aliexpress.com/item/40001732 ... pt=glo2ita

The heat sink of the horizontal output transistor (Q501) is a good point for ground and R592 is raised from the board so you can attach the clip to its leg easily (red arrow, ignore other arrows):

https://i.imgur.com/9IMOV0Z.jpg

After you see that 12V is present you can move on to the area that is more likely to be faulty. The first step is to check that the circuit is getting power. There are two supplies, one for the scanning period (24V) and another for the flyback period (50V or so). Keep using the croc clip method (ground point same as above):

https://i.imgur.com/8JxXuDQ.jpg

If there's no voltage check if R535 (and R541) is good or open (very low resistance across it, no need to desolder it). Both are behind the flyback transformer.
Thank you! This is extremely good advice! Yes, I think that I was mistakenly thinking that any issues would be limited to the 12v power line. I did not really understand the part of the two supplies, scanning period and flyback period. Where exactly on the board should I measure/test these voltages? Where is the vertical circuit located? This weekend I will check to see if 12v line has power. Btw how do I know If any of the transistors is broken? Thanks again!
Nevermind, I just took a peek at the manual again and was able to locate r535. Makes sense. Thanks again for the good advise!
HermanMunster
Posts: 44
Joined: Sat Apr 18, 2020 10:45 am

Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

MKL wrote:A failure in the vertical deflection circuit (Q512/513/515) is more likely than a bad IC507. If you want to ascertain that the vertical part of IC507 is getting 12V, put the meter on R592 and see. I recommend to put croc clips on the probes and attach them to the parts you want to measure before powering the monitor instead of holding the probes with your hands which could lead to further trouble. Something like this:

https://it.aliexpress.com/item/40001732 ... pt=glo2ita

The heat sink of the horizontal output transistor (Q501) is a good point for ground and R592 is raised from the board so you can attach the clip to its leg easily (red arrow, ignore other arrows):

https://i.imgur.com/9IMOV0Z.jpg

After you see that 12V is present you can move on to the area that is more likely to be faulty. The first step is to check that the circuit is getting power. There are two supplies, one for the scanning period (24V) and another for the flyback period (50V or so). Keep using the croc clip method (ground point same as above):

https://i.imgur.com/8JxXuDQ.jpg

If there's no voltage check if R535 (and R541) is good or open (very low resistance across it, no need to desolder it). Both are behind the flyback transformer.
Hi! I just performed the tests that you suggested. I did get 12.1V dc from r592, so IC507 is getting the correct voltage. However, I measured 121.1V from D528, which is supposed to read 50V. I also measured -8.97V (negative voltage) from D530, which is supposed to read 24V. Does this mean that I have bad transistors in the vertical circuit? Thanks!!
Last edited by HermanMunster on Sat Jun 03, 2023 4:56 am, edited 1 time in total.
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

R535 and R541 have the correct resistance. Any other tests that I could perform to identify the issue?
MKL
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by MKL »

You have vertical collapse but the line doesn't cover the whole screen horizontally which points to a pincushion issue as well and since the pincushion circuit (pin 8 of IC509 through R1514) works with the same 24V line as the vertical circuit, this would explain both issues.

This point (R541) is the same as the anode of D530. Do you read the same on either points?

https://i.imgur.com/xUgF11I.jpg
measure on the other side of the board of course and use this heat sink for the negative lead:
https://i.imgur.com/QCaN9jW.jpg

If it's proven that there's no 24V there, desolder that side of R541 so the leg is hanging free from the PCB and solder (with extension wires) a 470uF cap across the free leg (+ of cap) and ground (- of cap). Then check if 24V is back on the leg of R541. If not, pull D514 from the board and test it.
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

Hi! Thanks again so much for your help! I re-measured resistance on R541. Yesterday I thought that the reading on my multimeter was 0.5 ohms, but today I realized that the actual reading that I am getting for this resistor is 0.5Mohms. It looks like there is something wrong with R541.
MKL
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by MKL »

Desolder and measure it out of circuit.
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

2nd update: I measured 33.4V in D514 right before going into R541. Isn't there supposed to be 24V in D514? Could it be possible that both R541 anf D514 are broken? What would be a good replacement for this diode? I like to buy components at either digikey or mouser. I was thinking about replacing R541 with a higher wattage rated one so that it doesn't break again!
MKL
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by MKL »

The diode is fine (it could be replaced by RGP10J or BY299). Note that the screenprinting for this line is 30V (pin 5 of the flyback). If R541 tests open or very high ohms out of circuit you need to replace it but you also need to make sure there isn't a short on the other side or the resistor will go open again so with R541 off circuit measure resistance across the legs of C537. Low resistance = problem.

This is a possible replacement for R541 (needs to be flame proof/non-flammable and NOT higher in watts):
https://www.ebay.com/itm/QTY-100-1-5-Oh ... 645?_ul=AR
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

Thank you so much for your help! I really couldn't have figured this out by myself. I already bought the resistor and will be replacing it over the weekend. I will also test C537 as you suggested. I do have some high temp 470uf 63v capacitors, so I think that I'm just going to replace it. I will write back once I have any additional updates. Thank you again!!! If I manage to fix it, I will be re-caping the entire thing.

Btw this is completely unrelated to the issue, but I wanted to ask you if you knew what are the correct capacitor values for c584 and c572? I see a lot of conflicting information online about these two capacitors; some say that the correct values are 1uf and 4.7uf, others said that the correct revised values per Sony's bulletin should be 2.2uf and 10uf respectively. I read that these are the two capacitors that are most succeptible to failures in this pvm model. I have some 10uf 250v capacitors, so I could replace c572 as well if 10uf is the correct value. Anyway, this is off topic, the important thing is to get it repaired first!
HermanMunster
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Re: Help! V deflection issues with Olympus OEV203 - Sony PVM

Post by HermanMunster »

Hi! I just replaced the r541 resistor and the C537 capacitor along with other capacitors on the A board that I had values for. I was very skeptical that a resistor would just die like that without a short circuit killing it, as you suggested that could have been the cause. I soldered the new resistor in as well as the new c537 capacitor (I only had 470uf 63v available instead of the original 470uf 50v) and measured continuity against ground, and there wasnt any.

I turned the tv on and it worked! Thanks a lot! You are the man!! You saved me a lot of money and also saved a pvm from being sold as for parts only!.
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