Question about Sony GDM F500R Monitor

1 Answer

Sony GDM-F500R (G1 Chassis) has trouble turning on

I got this monitor used five years ago. Since then it has always had
the overbrightness problem, but I scraped by with brightness set to 0
and contrast to 100. This was annonying, and the local service center
in India refused to service it. About a year back, it started
exhibiting a new problem -- it will not turn at all! The power LED
will turn on, but will flash in amber every 1.25 seconds. Turning it
on and off did nothing. So I put the monitor in cold storage. After
about a couple of months, curiosity got the better of me, and when I
plugged it in, it worked just fine. It worked for some more months,
and then mysteriously, refused to turn on one fine day. All I got is
that blinking amber light. In frustration/desperation, I pushed the
power button for about fifteen minutes, and it turned on. Everyday
since then, regardless of whether it was in standby mode or turned off
overnight, my daily morning ritual is to repeatedly push the power
button in order to turn my monitor on. Sometimes it takes a few
minutes, sometimes over couple of hours.
After some googling, I was able to download the schematic for it and
also got information on using WinDAS to adjust its G2 register to
correct the brightness problem. I build the necessary serial cable and
now the monitor is close to perfect (displaywise: G2 was set to 199, I
lowered it to 155), except for the power-on problem.
Here is some detailed information on how I get to turn my monitor on:
With 220V supply:
1. Turn the monitor on. If amber light flashes, go to #2, else it
turns on.
2. Turn it off. Wait for 5 sec (exact)
3. Repeat from 1.

With 110V Supply:
1. Turn the monitor on. If amber light flashes, go to #2, else it
turns on.
2. Turn it off. Wait for less than 1 sec.
3. Repeat from 1.

The interesting thing to note here is that when the monitor does
eventually turn on, it is preceded by the sounds of relay clicks. Once
the relays start clicking, it will not turn on right away, but after a
few more on-off cycles, it will. The moment I hear the first relay
click, I am relieved since I know the monitor will eventually turn on.
But I think the problem is getting worse, since my daily wait time is
getting longer.

I suspect some electrolytic capacitor has gone bad, but don't have an
ESR meter. I am going to build an ESR meter and go over all the
electrolytic capacitors inside.

Does anyone have better clue than me, or is it a well known problem?


Posted by on

  • 2 more comments 
  • redblue Nov 13, 2007

    That's a good guess. The reason I don't think it's the relays is because if I turn the machine off for a short period (like a 5 minutes) the monitor comes back on fine. It's only after a longer period of sleep(or power off) like overnight that the problem occurs. This suggests at least some degree of temperature sensitivity. I'll keep an eye out for the relay though.

  • redblue Nov 14, 2007

    My apologies. This is my first post on this site, and its UI insisted on a rating after I read your initial response. I didn't realize that what I did was affect your persona's reputation rating negatively. Oops.
    I will check the things you have suggested, though.

  • redblue Nov 20, 2007

    I have made additional observations. The constant on-off cycles are not necessary. What I did was turn the screen saver off, so that the computer generated a signal continuously. Now all I have to do is turn the machine/monitor on and wait for about 20-30 minutes. The monitor turns on eventually. I guess the problem really is that the monitor takes a long time to turn on after more than an hour of rest.
    Maybe @24 seven is right in thinking it could be a CRT problem. I haven't had a chance to open the monitor yet (it's a bit time consuming), but will report any visual anomalies.

  • redblue Dec 05, 2007

    Fixed it.
    Turns out that the problem was bad capacitors afters all. Five of them in the power supply. 100uF and 47uF variety. I think there were two more that were borderline cases, but I left them in for now. From the looks of it, and how they were all clustered, I think the 5V regulator section must have kept them hot over the years, specially since standby needs this part of the circuitry live all the time.
    $0.18 repair saves a $1,800 monitor.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 883 Answers

Sometimes relay contacts get "sticky" from arc oxide corrosion whenever enough electricity is passed from metal to a perfect mechanical relay, the relay would be sealed in a vacuum. Try swapping relays to transfer the problem. If you can transfer it, you found the bad relay. I actually have disassembled relays and polished their contacts with great success.

Posted on Nov 13, 2007

  • 2 more comments 
  • Marty marty Nov 14, 2007

    yes, but you are rating my response based on new information not previously published, namely "if I turn the machine off for a short period (like a 5 minutes) the monitor comes back on fine"...Myself...based on initial data, would have provided "almost there" rating. You must remember that we cannot touch your problem. Only you can provide required data. I cannot get into a chat where I am asking you questions like this...I do not have that time. By the way, does the crt cathode heater glow during the time you are trying to start the monitor by holding the button? Does the cathode area have a silvery appearance or is there some white or gray creeping in? Is your crt in vacuum loss condition?

  • Marty marty Nov 14, 2007

    ok, now do me a favor. Select the "REPORT ABUSE" text at the top of this post...don't worry, it is only a message to the fixya people, they will take it from there...and then report that you want to change your rating to "Almost there". I'm sure they will do this based on what is printed here. Thanx.

  • Marty marty Nov 18, 2007

    Hello redblue,
    I emailed fixya and reported the issue. The reply was:

    "the user himself can still change his vote and give you a better
    one. Maybe you should
    continue your correspondent with him and ask him to do so."... Can you try doing this?

    Thank you.

  • Marty marty Nov 20, 2007

    Can you try doing this?



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Went into hot tub with g1 for like 2 secs then went out. now it turns on until it says g1 but it stays there then faids away

you could 'dry out' older phones when they got wet years ago, but these new smartphones have so many components that when wet, they usually ruined. If you have phone insurance use it, otherwise happy shopping. Best of luck

Sep 07, 2010 | HTC G1

1 Answer

Monitor takes several minutes to come on

ur problem is with VGA port of ur monitor check it out wether its connection loose or not the problem is of power signal its not getting a proper current supply so check it out otherwise repair it.....

Aug 30, 2009 | Mag Innovision Computers & Internet

1 Answer

Pop - bang noise then went dead after a period of time

You've blown a capacitor and probably the horizontal output circuity. It's time to get a new LCD monitor.

May 30, 2009 | Sony GDM F520 21" CRT Monitor

1 Answer

Screen image on GPS 400 PS jiggles

Make sure that the driver is updated. Then if it is, contact apple.

Feb 08, 2009 | Sony GDM-400PS 19" CRT Monitor

1 Answer

I have a Sony monitor model GDM 20 E01 defected ,need another

maruan, That's was a nice monitor,, yes there are some monitors that still use the RGB BNC, but your computer still has a standard monitor connection or DVI from the video card, a new monitor will come with a cable.  Prices are down now on LCD's - the all-purpose LCD that are PC and TV compatible have those connections but they aren't as nice. randy320sgi

Jan 09, 2009 | Sony Computers & Internet

1 Answer

Sony 24'' CRT widescreen GDM-FW900 blurry after initial on

CRT shorts are common with this model and focus problems are a major symptom. however, the loud 'pop' you described leads me to believe that the flyback transformer may have a problem in the focus divider portion. replace the flyback, if that fails then the CRT is most certainly the problem

Nov 20, 2008 | Sony GDM-W900 24" CRT Monitor

2 Answers

Tv turns off tne comes back on

Please count red light flash again.

5 times flash shows Lamp Error.
6 times flash shows No "DD 6V " output (G1 board) Its bit technical term.

Need fuhrer help, please Post it here.
Thank you.

Sep 21, 2008 | Sony Grand WEGA KDF-50WE655 50" Rear...

1 Answer

Screen always bleu

ok.. most probably the data cable of your monitor is damaged.. try to check it if the pins are still in tact.. if not, then you should replace it with new one..

Jan 20, 2008 | Sony GDM-400PS 19" CRT Monitor

1 Answer

Monitor wont turn on

Check with another monitor, you will know where the fault is then.

Apr 02, 2017 | Sony GDM-400PS 19" CRT Monitor

Not finding what you are looking for?
Sony GDM F500R Monitor Logo

283 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sony Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18420 Answers

Alun Cox

Level 3 Expert

2678 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Are you a Sony Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides