Solution for POLAR-66 Display Issues

Hi Guys, I have a solution for POLAR -66 display defects. As known, they develop black lines and dead pixels over time. Here is before and after:
Please PM me if interested.

 

Dear Sir,

I have one 1997 Polar 66 E in stock and my machine have around 12 pixel lines dead like your first 2 pics. how can you invert the colors on the display or what have you do to fix it?

Best regards,
Rafael Abreu
+351 926756270
rafael.mdftrade@gmail.com

 

Hi, I have replaced the LCD Screen with aftermarket one that is a perfect match.

 

Hello,
we had the same problem as OkiTech mentioned, even worse: the lower part of the screen is black.
Then we bought an LCD-Screen with the same Product number (Hitachi ...) and built it in.
The first time the machine started properly - everything looked fine. The second and following starts of the machine it doesn't work anymore.
On the screen it shows the following message:
Has anybody an idea, what the problem could be?
Many thanks for any reply.
best regards,
Bruno

 

Hi Sir:
Will be a Good idea to call the company , where do you buy it the
LCD display. Some times coming with defects.
Tight and clean the connector or plug for the LCD, look if there are some flat or ribbon cable Broken.
However you must see if the Power supply Feed the LCD is o.k are in the Range.. see the schematic diagram
This can be damage the LCD display.
Let me know.

 

Thank you, chock, for your reply.
the confusing thing is, that when we built in the old display again, it worked again. Then, when we took the new one, it worked properly after the first start. Then, it stopped working again and showed only the message above.
After some changes between the old an the new LCD both showed the message "waiting for update".
So I think the connectors, cables and the power supply should be ok.
On the main board there is an eprom. The label says: KV-66 V1.2.1. I guess that here the whole software of the machine is memorised.
Could it be that this eprom needs to be changed?
greetings, Bruno

 

Sir:
Is possible that you have 2 problems:
1) Power supply faulty 2) Any ROM or EPROM or E2PROM, has 2 terminals: Vcc +Ground. Vcc represent the power supply
when the power supply is faulty, affect the IC called Rom, or Eprom or E2prom.
Of course you must examine the Ground if you have a good Ground in the system, Not properly ground affect too, the Electronic+electrical system, since they are close the circuit in any Loop network !
2) Of course the Eprom maybe is NOT compatible with his Model machine and LCD.
3) In short try to test again the power supply use the Schematic Diagram, and see if there are o.k in tolerance , must be o.5% very
critical, Up or down replace or repair. Test the cables, see if there are broken pins, or dirty, or corroded,use special clean contacts cleaner.

 

Hello Chock
many thanks for your reply.
we tried to measure the Voltage of the LCD backlight, but we didn't get a proper result. According to the scheme it should be 350 V, which is astonishing. I would rather prompt a value about some Volts.
Now I found a Scheme (see picture). I made also pictures of the mainboard.

Some remarks to the 3 points obove:
1) I'm not clear how to check the power supply. Is it possible, that it's broken all of a sudden?
2) it seems a possible answer. The funny thing is, that it worked fine for 2 times.
3) How can I test the power supply? I post some pictures of the main board.

Many thanks for your help.
Blessings too,
Bruno

 

attached is there the schematic that you send me.
I did indicate in Red circle 2 power that you must measure exactly.
a) +5Vdc b) -350Vdc you can do it with a Good DMM like Fluke.
the voltage range tolerance must o.5% up or down.Otherwise you must replace or repair.
Power supply is located in the control box of machine, indicate by 1G1+1g2 Look for the schematic diagrams.
The power supply Feed the Display LCD.
Yes is possible the can be faulty the power supply.

 

Now I tried to measure the voltage.
a) I measure 5.17 V
b) I cant measure properly. The DMM shows out of range an it gives some small sparks when I come near to the pins. Maybe that the resistance of the DMM is not high enough an there is too much current flowing.

Do you think that the proper voltage can be the reason, why it prompts a software update? I can's see the connection. Or is the message on the screen not the real problem?

 

Did you get +5Vdc ? b) -350Vdc ?? you can do it with a Good DMM like Fluke
If you have the Voltage properly, the Lcd is faulty!
Sorry.

 

I was able to measure a) + 5.17 VDC
with b) 350 VAC I was not able to measure properly. One technician told me, that this relativly high voltage is nessecerely to start the LCD-backlight. And this works fine, the light turns on correctly.

So I think the both measured voltage values are fine. And both displays, the new one and the old one work fine.
For me the problem remains because it says on the display "waiting for software update".
Many greetings,
Bruno

 

Hi bruno:
There are other test that you must be to do in CPU board,
However is very difficult to explain in the forum

 

Hi Chock
one hour ago we found out the mistake!
It was a simple problem:
A socket of one button was not in the right position. Since we had to lift the mainboard a little bit in order to mount the display, the socket of one button was moved a little bit. The consequence was, that this button was pressed all the time. When the machine started up, it could not go further in the startup process, because one button was pressed all the time.
It's so simple but it took a long time to find it out . . .
Thanks for your patience ...
Blessings to to you and your house
Bruno

 

I am interested. What is next step.

 

I would also like to purchase this new screen.

 

Sir, I am not with the Company anymore and all the records were left there.
Get to the LCD itself, it is not made by Polar obviously but rather a generic industrial display, it will have a Manufacturer stamp - like Hitachi or so and a P/N. Google it - it should be available on the open market. It may have a different plug/connector for a backlight bulb, but it is not a rocket science to reinstall the connector form your old display. It is uses Cold Cathode Bulb I believe, so voltage is pretty high between inverter and a bulb so make sure you isolate it properly. Soldering wires (not twisting) and shrink-tube should be sufficient.

 

Hi sir:
I would like to receive the complete tech documentation
about the LCD.
Since this will be another option for User Polar 66.

 

Yes I'm interest in replacing the display for polar 66.

 

Hi. This is a very old thread. I had sold my businesses and all "how to" documentation stayed there. There was no demand for this so I had decided that nobody needs this.