VON 2.1 Channel woofer works a few minutes then stops

 A customer called me concerning a woofer that she wanted checked by a technician. She told me that the woofer was dead. I was in a hurry, so I did not have time to confirm the customer's complaint, which is very important.

 I picked up the woofer on my way to my shop. upon reaching my shop, I applied the power, and the woofer was up and running. So I just kept it aside to do other things.

NordicTrack Treadmill Motor Controller model MC2100ELS, Control Board Power Supply dead now repaired.

I received a phone call from a client who wanted his treadmill control board checked by a technician.

I scheduled him the following day since I was busy at the time.

The following day I visited the company where he works, the treadmill was used as the worker's gym facility.

On arrival, I found the board was already taken out of the treadmill and in his office.

I did some initial tests and found IGBT (K50DDTP), an Insulated-gate bipolar transistor dead short.

I tested other components and all looked good according to my meter, Customer pointed out that the main circuit breaker tripped when the treadmill was powered.

 

Ramtons inductor cooker model RM381 came in dead, now repaired.

 I received the above inductor cooker in my shop for repair, dead on arrival.

I opened It and did some scanning on the power board, coil, and display circuit and all looked in good shape.

LG 49-inch LED television model 49LH549V has no picture but sound was okay.

 I received a phone call from a client who wanted his television checked by a technician.

The client told me he suspected backlight failure, so I proceeded to the site armed with all equipment for any scenario.

Sony Home theater model HBD-DZ650 changing function automatically now repaired.

 I received the above home theater in my shop for repair, complaint from the customer was changing function automatically.

Since I was busy I requested him to leave his contact so that I can let him know when ready. Later I opened the machine.

Cool steamer producer is repaired

 I received this machine on my bench,With commercial name of  EMSIG made in china.

Why electronic protector talking long to activate protection mode.

 

The problem of this AC line surge protector was not starting to  give protected AC before 6 minute, something must be wrong  inside the machine since there was no diagram for this circuit  as general services first I re-solder all the joints then the most  problematics part are e -capacitors I had three on the board.

10 microfarad @50 volts

220 microfarad@25 volts

22 microfarad @ 16 volts

The value of 220 microfarad cap was changed to 200 micro and  ESR 148 ohm that was not good two others were not bad  enough by replacing the cap machine start to give voltages  after 2 minute

Article brought to you by Mr.Beh. based in Tehran City-Iran.OP AMP DBL 324