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GEDEME Fridge Protector Repaired

By on December 30, 2015
gedeme fridge protector repair










This Fridge Line Protector Brand GEDEME, Cuba made, model CD 3200 was brought to me fully dead, and it had been checked on by other tech.

GEDEME Fridge Protector Repaired

First thing done was to open the device, only 4 screws.

And then when the Bridge Rectifier was tested with the Digital Multimeter there were two diodes shorted (1N4007). They were extracted from the circuit.

shorted diodes

At this time the four diodes were substituted for similar ones.

4 diodes

When the device was connected to the AC-mains (110 volt in my country) look what happened.

ac protector device

The yellow LED named Voltage bajo (Low Voltage) was lit all the time and it never was off. So there was another malfunction in this device, so let´s check it again. Some components were checked on with the Digital Multimeter and look what I have found:

resistor leads shorted

As you can see in the photo above there were two shorted-resistors, and both had no connection in the bottom side of the PCB. Both leads of these resistor were separated.

Note: I think this kind of situation could never happen if the manufacturer have a good quality check.

resistors good

Afterwards when the device was connected into the AC-mains to check it on, look the result.

ac protector device repair

The red LED named En espera (Waiting) began blinking for about 3 minutes and a half, and later on look what happened in the photo below:

fridge ac protector device repair

Now the green LED named Voltage normal (Normal Voltage) was on and the output voltage checked with the Digital Multimeter was 115. 2 volt. I´m used to check the output voltage (apart from Normal Voltage LED is lit) because the relay could be damaged and this way I´m sure there is voltage in the output.












This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.


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  1. Albert van Bemmelen

    December 30, 2015 at 7:43 pm

    Nicely done Humberto! Maybe we can start to manufacture these devices in our Country too, or for that matter in the whole of Europe because we do not have these yet. But we do occasionally have a power loss. Once or twice a year, mostly because somewhere there probably is an illegal power tap from a Weed factory or something like that. It is uncertain if these thing also eventually will cause a Power Surge that could destroy our electronics.

    • Humberto

      January 8, 2016 at 9:09 pm

      You are right Albert, this devices protect our electronics and appliances and therefore they are necessary. Thanks.

  2. Yogesh Panchal

    December 31, 2015 at 12:38 am

    Good job! Humberto.

    • Humberto

      January 8, 2016 at 9:12 pm

      Thanks Jogesh

  3. Mark

    December 31, 2015 at 6:28 am

    Hey Humberto,
    Good article! It is very frustrating when you find an obvious fault and then when you go to test it find that is not the answer. Never mind, it helps us to hone our diagnostic skills and it is worth working through the testing procedure for the satisfaction you get when you have finally repaired the item.
    Keep up the good work!

    • Humberto

      January 8, 2016 at 9:16 pm

      Yes Mark, we comment all our experiences in this blog and every one of us learns day after day.

  4. Robert Calk

    December 31, 2015 at 8:16 am

    Good job, Humberto.

    • Humberto

      January 8, 2016 at 9:25 pm

      Thnaks Robert, I could not find the culprit, me was finding a bad component all the time in the circuitry, as usaul, and finally the culprit was two leads together. A new experience for me and for the readers too.

  5. Parasuraman S

    January 1, 2016 at 7:14 am

    Good job! Very quick and satisfying result! Very interesting in finding a 'loving and caressing' resistors (Ha, Ha!) Nice article! all the best!

    • Humberto

      January 8, 2016 at 9:26 pm

      Thanks Parasuraman, a new experience for me with this repair.

  6. Paris Azis

    January 3, 2016 at 6:37 pm

    Hey Humberto

    Good job! Now, a few words about the shorted resistors and the effect they caused. First of all, the main problem is of course a design quality issue. Wherever (through hole) resistors are intended to be used in vertically mounted position on the PCB, if quality obeys high standards they should always have their long exposed terminal fully painted and therefore isolated to their adjacent and similarly exposed ones. Otherwise the space economy attempt through their vertical positioning (on the manufacturer’s part) has a high cost in failures (reflected on the owner’s part) as in your case here. Apart from that, and most likely, the previous technician himself had inadvertently caused this short trying to restore its proper function without taking equally proper care in what he was doing during his attempt.
    And some questions…Is this device powered by L.F transformer or is transformerless (capacitive)? Is it using the quad op amp LM324? Can you please answer me these questions? (It would be clearer to me if you had provided us with an additional photo showing the overall component side PCB view)…

    Best Regards

    • Humberto

      January 8, 2016 at 9:36 pm

      Hi Paris, first of all I´ve seen this kind of situation as you say: painted terminals. But I´ve seen too another method of isolation: the terminals are cover by a spaghetti, as we usually call in my country.
      This device is transformeless (capacitive). It has one or two (do not remember exactly now) ICs. It´s a pitty I do not have this device with me now, the owner is using it, but I´ll look for a similar to take some pictures and send them to you by means of Jestine Yong.

  7. Paris Azis

    January 9, 2016 at 5:29 am

    Hello Humberto

    Thank you for your feedback. There is no need to hurry for sending me the info I asked. Perhaps you will fall again in a similar repair very soon…Anyway keep this in mind and send me this info whenever possible. I need it just because I like op amps very much. Analog control attracts me! Thank you in advance!

    Best Regards


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