Friday, March 16, 2018

Sony home theatre DVD receiver model HBD-DZ350 dead now repaired

My neighbour brought to me this DVD receiver to my shop for repair a few days ago.

I did my usual initial test by connecting it to the power outlet even before opening it.

I noted the machine was powering on briefly and then shutdown, with this I concluded that the machine is getting powered but shutting down due to overload somewhere within the system.

With this in mind now it is time to open up and find out where the problem is.

Monday, December 11, 2017

How to troubleshoot any SMPS which main fuse keep on blowing

Whenever you find the main fuse is blown and darkened inside please don’t replace it and power on the equipment because chances are very high that it will blow again.

In this case substitute the main fuse (across the two pins of the main fuse holder with a series bulb.
You can make one easily as shown here below.

Monday, November 27, 2017

14 Inch China Television picture height low

I got a phone call from a client who wanted his television checked, I visited the place and was shown the television and when switched on I noted the picture was only present from the center of the screen to the bottom and also some retrace lines at the bottom.

Usually whenever you see the screen is not full vertically means there is some problem with the vertical circuit meaning it is not doing its work of opening the screen vertically.

Since the owner wanted the TV back urgently he decided to accompany me to my workshop and once on the bench I opened the set and went straight to the vertical circuit.

Monday, November 13, 2017

14 inch JCV Television dead now repaired.

I customer came to my shop and asked if I can check out his television with went dead yesterday while watching news.

He went back to his house and after ten minutes he was back with the said television.

I plugged the TV via my series bulb to confirm what he said and indeed the TV was dead.

Looking at the fuse I noticed it was not there, further checking I noticed the TV was from another technician and after repairing decided to use a just wire instead of actual fuse.

Thursday, November 2, 2017


A friend of mine called me to pass by his place to check on his television which was indicating no signal on the screen.

After passing by I went straight to the antenna connector at the decoder and noticed that it was loose which I re-connected and the problem was solved.

Friday, October 13, 2017

14 inch Hotpoint CRT Television (model 14J10) dead with power on led red now repaired.

I received this TV on my bench and the complaint was dead but power ON led was lite(RED) as it was in standby mode.

The owner has suspected a minor problem since the Power ON led was on and therefore expected minimum charges.

After opening the television I figured out that since the power On led is lite, power is reaching the secondary side.

Therefore with the power off I decided to do resistance test of the H.O.T transistor by testing between the middle (collector) and the emitter leg and I got a beep.

I reversed the probe and got another beep, with this I concluded the H.O.T is shorted.

Saturday, September 16, 2017

Sayona SHT-1132BT Woofer repair dead now repaired

A few days ago I got a knock at my gate very early in the morning and I wondered what could have necessitated the visit and I almost came out armed.

Upon opening the gate I found one of my neighbor standing there holding a woofer and after excusing himself he told me that he wanted it checked urgently and he suspect it burnt after the power surge though I can’t remember experiencing any in my house.