Monday, July 26, 2021

Understanding home theater Channels

Most people have problem in understanding home theater channels, in this article i am going to shed some light on the same.

Sometimes we see home theaters written 5.1, 7.1, 5.1.2 and so on.

What does this mean? 

This refers to channels; you may think of channels as speakers.

           Old stereo system is now referred to as 2.0(2 channels or 2 speakers)

           2.1 has 2 speakers and 1 subwoofer

           7.1 has 7 speakers and 1 subwoofer

           5.1.2 has 5 speakers,1 subwoofer and 2 dolby atmos speakers

Dolby Atmos speakers- where we place 2 or more speakers on the ceiling, now we are talking of 3D sound, where any sound can hover at any point in space.

Example: 7.2.1 has 3 speakers in front, 2 at the sides, 2 at the rear of the room and 2 in the ceiling and 1 subwoofer at the back (can be placed anywhere).


Learn how to repair home theaters all model here.


For those visiting from Kenya our office direction is here



Wednesday, July 14, 2021

32 inch SONY LED television model 32R420B dead, red lights blinks 6 times now repaired

 I received a phone call from a friend who wanted his television checked by a technician; I scheduled him the appointment and he logged in our office the following day.

First I wanted to confirm the symptoms he has given me before opening the television in his presence.

I noted the screen was trying to display but shutdown immediately.

After 30 seconds I noted the red light will start blinking, I decided to count the number of blinks and noted they were 6 blinks, 3 second break, and then start again.

Tuesday, July 6, 2021

LED television backlight replacement

LED backlights have a lifespan, for branded tvs like Sony, LG, Samsung etc they go up to 5 years without issues.

But other brands most start developing backlight issues after 2 years is common.

Kindly note that LED backlight are connected in “series”, this means if only one piece is open, the whole set will stop working.

If one led get shorted the tv will continue working but there will be overload to the remaining LEDs and therefore it will be a matter of time before the remaining leds fail and if any of them open, again the television will loss picture.

From experience, I have seen the best cure for backlights is changing all backlights at the same time to avoid customer coming back with the same problem after a few days or weeks. This is particularly notorious with Sony televisions.

Sunday, June 20, 2021

Daewoo microwave oven model KOC-9Q5T came in dead now repaired.

 I got a direct message on my Facebook account from a client who wanted her microwave checked by a technician.

 

I gave her my pin location and within an hour she was at my shop via uber.

First I wanted to confirm what the customer said was the symptoms of making noise while warming food but realized the machine was totally dead.

I opened the oven and went straight to the main fuse and found it there but next to it was a huge jumper wire which was also open.

Sunday, June 13, 2021

14 inch LG CRT television dead now repaired.

 I received this television from a customer with dead on arrival symptoms, I checked the main fuse and found it okay.

I tested the HOT transistor and found it okay, next I pulled my ESR meter and begin testing esr for all big filter capacitors on the secondary side and bumped on one which has esr reading very high, actually around 150 ohms.

The capacitor was rated 47uF/160V, this is the capacitor which filters the B+ voltage.

Thursday, June 3, 2021

LG home theater model LHD657 came in with S-protect symptoms now Repaired!

 I received this machine with the above symptoms in my shop a few days ago, I opened the machine and went straight to the audio amplifier which from my experience is the major cause of this error.

Friday, May 21, 2021

LG 32-inch CRT television dead now repaired

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

I requested him to bring it to my shop so that we can check it out.

Within thirty minutes he arrived at the shop, according to him the television was hit by power surge but when I opened it I did not see any sighs that it was power surge related issue.

I scanned the board top side and I did not get any suspect component.

I turned the board to the bottom side and noted numerous dry joints and one component burnt as you can below.