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perseus142 replied to Sencor SCD 3554 MR - no backlight

in Troubleshooting Audio Equipment

01-24-2018, 01:58 PM
Re: Sencor SCD 3554 MR - no backlight

R_J you are right.
I desolder those 2 pin in order to remove the white plate (light pipe/difuser) and found a SMD LED.
I did measure 6,8V on the pins, so I need to find suitable LED.
I will replace is and post some pictures after the weekend.
Thank you for help.

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perseus142 replied to Sencor SCD 3554 MR - no backlight

in Troubleshooting Audio Equipment

01-24-2018, 03:12 AM
Re: Sencor SCD 3554 MR - no backlight

Under the display there is following:

- [U]a thin white plastic foil/or tape[/U] with grey border. It is not connected to anywhere, it only sits under the display and it is partly glued on the clear panel underneath

- under the white foil sits [U]a plastic clear panel or plate[/U], about 2-3mm thick, it seems on side soldered to two pins, marked on bottom side. I dont see any LEDs under this clear panel.

I also checked all those SMD reistors - showing the value as per code, ZD and capacitor also tested...

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perseus142 replied to Sencor SCD 3554 MR - no backlight

in Troubleshooting Audio Equipment

01-23-2018, 04:47 PM
Re: Sencor SCD 3554 MR - no backlight

Originally, it looked like ...

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perseus142 started a topic Sencor SCD 3554 MR - no backlight

in Troubleshooting Audio Equipment

01-23-2018, 04:46 PM
Sencor SCD 3554 MR - no backlight

Hello guys,
I am experencing no backlight issue on detachable panel of my car stereo.
FM, CD works fine, information are sent and shown on the display however due to no backlight it is hardly readable. There is orange backlight for buttons - works fine and white backlight for display - currently off - dont know why.
It is not a menu settings - already checked.
Inspected board and no problem seen.
There are probably signs of glue ? Please see red arrows and advise. Anything to worry about ?
Also I replaced both capacitors 2200U and 470U however no luck...

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perseus142 replied to ATX-725B - start load ?

in Troubleshooting Power Supplies and Power Supply Design

01-14-2018, 01:12 PM
Re: ATX-725B - start load ?

Exactly. Ohms law.

From your experience,what resistor value (ohms,watts) would you recommend in order to use safetely this ATX power supply as cheap lab bench power supply ?...

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perseus142 started a topic ATX-725B - start load ?

in Troubleshooting Power Supplies and Power Supply Design

01-14-2018, 09:50 AM
ATX-725B - start load ?

Hello guys,

I found an old ATX power supply which I would like to use as cheap power source of 5V and 12 V.
It has been working fine after I short green-black wires to start up it and plug 10 ohm/5W resistor as load to 5V/26A rail (red-black wires).

However after a minute this resistor became hot.
Without the resistor the power supply will not start.
I havent found a datasheet for this power supply.

Could you advise me a resonable resistor load and tell me how to estimate the value ?

Enlight Corporation
ATX-725B 250W...

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Last edited by perseus142; 01-14-2018, 09:51 AM.
perseus142 started a topic Type of capacitors in Wifi router

in Troubleshooting & Designing Networks

09-14-2017, 04:35 AM
Type of capacitors in Wifi router

Hello guys,

may I ask you for confirmation whether to use solely low ESR capacitors in a Wifi routers ?
I would like to replace these cap. because they are showing higher ESR.
I dont know the brand, neither the datasheet was found. However on the caps is written: PEACE, either CD11XH or CD263.
It is from zyxel router "vmg 1312".
Caps are warm but not hot. These are close to power cord....

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-28-2017, 10:37 AM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Right. After desoldering the working one I measured Uz=9.36 V
My new 10V zener diode has got Uz=9.6V.
Is that suitable replacement part ?

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-25-2017, 08:39 AM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

An idea how to determine whether is this 10V or 4,3V ?
0 and O looks similar ...

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-25-2017, 07:54 AM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Amazing
How did you decode the diode ?...

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-25-2017, 06:20 AM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Another broken part - could you help me with identifiacion please ?

SMD diode HD1, HD2: [COLOR="Red"][B] O8W 4X[/B][/COLOR] - unable to find on google

Have you seen it before ?Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Another broken part - could you help me with identifiacion please ?

SMD diode HD1, HD2: [COLOR="Red"][B] O8W 4X[/B][/COLOR] - unable to find on google

Have you seen it before ?Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off...

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-23-2017, 12:46 PM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Thank you very much....

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perseus142 replied to Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-23-2017, 02:00 AM
Re: Zyxel WiFi VDSL VMG1312-b30b dsl port off

Thank you.

Right, I did measure open circuit in both directions, so it might be ok ? Or is there anything else what I could test/measure here ?

For education purposes, is there a way how to decode the color code/strip on it and find out the exact model ?...

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perseus142 started a topic Zyxel WiFi VDSL VMG1312-b30b dsl port off

in Troubleshooting & Designing Networks

08-22-2017, 03:43 PM
Zyxel WiFi VDSL VMG1312-b30b dsl port off

Dear all,

I am experiencing troubles with my wifi zyxel router VMG1312-b30b

[COLOR="red"]DSL port is off, DSL cable isnt detected[/COLOR].
WiFi, Ethernet ports are working well, GUI accessible.

After inspection of the box is obvious, that resistors [COLOR="red"]R8, R16[/COLOR] are damaged/burned. Unfortunatelly, I am not able to find electronic schematic so I dont know the resistance.

Could anyone help me with identification of SMD [COLOR="Red"]R8, R16[/COLOR] please ? These are next to DSL (RJ-11)and...

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perseus142 replied to New Members - please post your introductions here

in Announcements & Related News

08-22-2017, 02:43 PM
Re: New Members - please post your introductions here

Hello folks,
thanks for accepting my registration. I am keen on networking and electronics.
Bye

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