Member Avatar for ramesh_natesan

my coby mp3 player does not turn on (no lcd display) when I turn it on. I tried conneting the mp3 player to dc adapter and also tried using batteries. But no use. The player requires 2 batteries or a adapter 4.5 v dc. But does not turn on..please help me...my warranty period expired too (90 day warranty)...

Ramesh Natesan :-|

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  • Latest Post Latest Post by caperjack

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A short, practical diagnostic checklist for a Coby MP3/CD player that shows no power or a blank LCD — building on points from , and but focusing on concrete, verifiable tests you can do before paying for service.

Tools: digital multimeter (DMM), a known-good set of AA batteries, cotton swabs and isopropyl alcohol (90%+), small screwdriver if comfortable opening the case.

  • Measure each battery individually with the DMM. Fresh alkalines read ~1.5 V and NiMH ~1.2 V. A single weak cell can make the unit appear dead even if the pack looks OK.
  • Measure the wall adaptor at the barrel with the DMM (DC volts). If the adaptor reads far from its rated output or drops to near zero when plugged in, the adaptor is faulty.
  • Do a simple LCD check: when you try to power the player, shine a bright flashlight at an angle on the display. Passive LCDs often show faint segments if the backlight/inverter has failed.
  • Inspect the battery springs/contacts for white/green residue. Light corrosion can be cleaned with a cotton swab and isopropyl alcohol; heavy alkaline buildup can be neutralized carefully with a drop of white vinegar, then wiped and dried. Do not power the unit until fully dry.

If you have meter experience and are willing to open the case: with power sources removed, check continuity of the power switch and measure voltage at the internal battery connector while applying the adapter (use current-limited source if possible). Look for obvious blown components or a small resettable polyfuse near the jack. Do not bypass fuses.

If these tests show correct voltages but the unit still won’t wake, the fault is likely an internal regulator, switch, or board-level failure. Given the age and low replacement cost of many Coby players, weigh repair cost against replacement or parts salvage. If any step feels risky, seek a local electronics technician.

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Member Avatar for OurNation

Has it turned on before

Member Avatar for caperjack

my coby mp3 player does not turn on (no lcd display) when I turn it on. I tried conneting the mp3 player to dc adapter and also tried using batteries. But no use. The player requires 2 batteries or a adapter 4.5 v dc. But does not turn on..please help me...my warranty period expired too (90 day warranty)...

Ramesh Natesan :-|

is it the disk mp3 player or digital one ,did you drop it maybe ,,how long did you own it,did you put the batteries in right.

Member Avatar for ramesh_natesan

is it the disk mp3 player or digital one ,did you drop it maybe ,,how long did you own it,did you put the batteries in right.

it is a mp3/cd player and not the digital one. i put the batteries in right. I did not drop it down..any suggestions...

Member Avatar for caperjack

it is a mp3/cd player and not the digital one. i put the batteries in right. I did not drop it down..any suggestions...

No .not really ,it is strange when something works and just stopes working ,for no aparent reason .give the bugger a shake !

Member Avatar for SAZAR

Hmmm... Maybe it is a case when just a display doesn't seem to work, but the rest still works? Did you try operating it nevertheless (not paying atention to display)?

You said that it doesn't work on batterieas nor adapter. Maybe some wire conecting power supply to the rest of the aparature inside the thing got loose?

Have you consulted your device's operating manual (troubleshooting guide)?

Maybe there is a speak about such problem on the Internet?

Did you get it to the repairmen or someone expirienced to check it out?

Have you tried opening it (carefully) to see what's inside - maybe you can locate a problem yourself?

When you used power supply from adapter - did you use the one thet came with the player or an universal one (with the voltage slider - so you incidently put a higher voltage than required so it burned it up).

Maybe someone acidently spilled something on it?

What was the last thing you've heard on it? How much time passed between then and the time you realised it doesn't operate properly? Have someone else had an access to it when you wasn't there?

Any other detail you haven't told here?

Member Avatar for ramesh_natesan

is it the disk mp3 player or digital one ,did you drop it maybe ,,how long did you own it,did you put the batteries in right.

thanks for your suggestions and help.

http://rameshnatesan.blogspot.com

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