Diode marked as "E57".........not able to find it by reference - Badcaps

New Members (required) Introduce yourself here. Read the Forum rules here.

X

Francesc V.

Tempus fugit

Join Date: Nov 2022

Posts: 224

Country: Catalonia
#1

Diode marked as "E57".........not able to find it by reference

06-14-2025, 09:56 AM

Hi:

I have what it might seem a zener diode. It's marked as E57, but I haven't found any reference that might match my observations.

I've took one from the same circuit and tested isolated with the power supply and a 1k resistor. with 10V, the possible zener stays at 6.6V.

It seems a SOD123 package. It measures (2.6mm x 1.6 mm).

Any idea? it's a 6.6V zener?

Attached Files
Tags: None
truclacicr

Badcaps Veteran

Join Date: Apr 2019

Posts: 296

Country: australia
#2

06-14-2025, 12:27 PM

https://ok.100y.com.tw/Goods/35473 (MMSZ5235BT1G)

https://www.mpartn.com/wp-content/up...SZ5235BT1G.jpg (photo)

https://www.onsemi.com/download/data...z5221bt1-d.pdf (datasheet)

Last edited by truclacicr; 06-14-2025, 12:30 PM.
Comment
Francesc V.

Tempus fugit

Join Date: Nov 2022

Posts: 224

Country: Catalonia
#3

06-15-2025, 01:14 AM

Originally posted by truclacicr

https://ok.100y.com.tw/Goods/35473 (MMSZ5235BT1G)

https://www.mpartn.com/wp-content/up...SZ5235BT1G.jpg (photo)

https://www.onsemi.com/download/data...z5221bt1-d.pdf (datasheet)

Thanks!!
Comment

Previous template Next

TV backlight zener diode

by unimatrix93

Hello everyone, I'm repairing an LG TV backlight and I noticed some strange behavior when I touching the backlight strip with a missing Zener diode.

So I replaced the leds on the strips and they seemingly working fine, but soon as I touch the strip which has a missing Zener diode the whole backlight turns off for a few seconds and then turns back on.

Is this caused by the missing diode? If so what kind of zener diode should I use to replace it?.

The led strips has 9 6V leds.

1 Photo
- Channel: Troubleshooting TVs and Video Sources
02-10-2025, 12:13 PM
NTE Electronics “NTE5251K” Zener Diode 9.1V @ 50W Do-5.5% Want to build a 9.1 output from a 9.6 lipo4 battery pack

by sam_sam_sam

I have bought this Zener Diode for this project what size and wattage resistor value do I need to use to get near 50 watt output
I bought this from an eBay seller but unfortunately they only had one

I bought three from Vetco Electronics these are Sylvania ECG5185A 9.1@10w A to Stud what size and watt resistor do I need to use to get near 10 watt output
I bought three of from them to also make battery packs with this output power limit in mind

I want to use this battery pack and turn it into a 9.1 output battery pack output to eliminate using 9 volt battery...
- Channel: General Electronics Technical Discussion
04-23-2025, 05:50 AM
What zener diode might fix the sound on Maestro Mayhem gaming chair?

by nev1001

Hi, I'm looking for a bit of help trying to fix the audio unit from a Maestro Mayhem 4.1 gaming chair please.

The chair has a few speakers and vibration motors. All was well, for a while, but now the sound is gone.

It may be significant that I discovered my son was powering it with a 19V laptop charger when it should run on 12V - it did fully work, for bit.

I think an issue could be a zener diode (or capacitor) which has shorted out.

The board's bluetooth input still works, the vibration motors are working, so is the line out socket but not the...
- Channel: Troubleshooting Audio Equipment
04-17-2025, 05:09 PM
Element 32 inches tv (ELEFW328B) Unknown component: Diode or zener?

by Vincenzo2

My Element 32 inches tv (ELEFW328B) lost it's backlight (confirmed with a flashlight test) and the connector on the PCB (it has one board that has a processor chip, switch mode power supply, and backlight circuit) that has the two wires that go to the backlight LED strips has a very low voltage (28-29 volts) when turned ON, in my opinion.

Started testing components and found an SMD diode or zener that is shorted (even zero fusing resistors read a few tens of milliohms, while this thing reads zero).

I put some pictures here to show that it is labeled "M7"....
- Channel: Troubleshooting TVs and Video Sources
09-07-2023, 07:43 PM
Corsair RM1000e - Help identify 5VSB Zener diode

by hobostove

Hey there guys. I've got a Corsair power supply that's come across my bench dead. I usually don't mess with power supplies, but it's a slow week so I'm giving it a whirl.

Taking it apart I heard a screw rattling around inside, and when I got it apart I found a couple blown components near what I think is the 5VSB area.

There's a 22ohm resistor that's melted and open, but it still has the bands.

The other part is a zener diode and it's top went to jesus, so I can't read the marking.

It looks like the diode connects the source and drain of a TNY284...
- Channel: Troubleshooting Power Supplies and Power Supply Design
03-27-2025, 02:25 PM
Loading...
No more items.

Working...