I received this microwave from a client who wanted it checked by a technician.
Initial test indicated
the machine was totally dead, I opened it and tested the power supply fuse and
found it okay.
Next, I checked the control
panel and found inductor L101 was open, I followed that line and noted it was
feeding IC100(NK364PN) and therefore suspected it could be shorted.
I received this home theater from a client who wanted it checked by a tech, I applied the power and noted there was no sign of life.
I opened up the machine and proceeded to scan the whole system, beginning with the power board and later motherboard.
I noted two capacitors with top part slightly swollen on the power supply section, usually if you get a capacitor with top part swollen it is advisable to replace it directly with testing.
I received this television from a customer who wanted it checked by a technician.
She told me that she suspect a loose cable and hence minor
problem.
I checked the voltage and found they are present even on the
secondary side of the power supply.
I also noted some components were getting too hot on the
secondary side (Never torch components on the primary side unless if you power off
and remove the power cable from the outlet) and since the power On led was off
means the microprocessor was also not getting power.
I decided to do new motherboard replacement, getting these
boards in my market is quite easy.
I visited the shop and I was back with one which was exactly the
same and therefore I expected easy fix, plug and play.
And yes the television fired on beautifully from the back I could
see backlights are on.
Turning to the screen I noted the picture/image were upside
down like you can see below.
I received this television from a customer who wanted it checked.
CRT television are getting phased out here
in Kenya very fast but still am getting a few from customers like the one
before us.
I asked the customer a brief history of the
problem even before opening.
He told me that it started to take time to
power up, 1 hour, 2 hours, 3 hours 9 hours, one day and eventually never
powered again.
With that I concluded the problem is
capacitor related and therefore when I opened it I first did scanning the
whole board and noted one capacitor with top part slightly swollen on the
vertical circuit.
This projector was brought by a friend who needed it checked, I powered the machine and this is what I saw on the screen.
I received a call from a client who wanted his television checked by a technician.
It was within the estate, so
using the direction he gave I was able to locate the place effortlessly.
I was visiting a client, who wanted her television checked by a technician; she has left a message to her neighbor who has a shop on the same block to direct me to her house.
Once I reached the shop, I introduced myself and my
mission there, while talking to the lady another client of mine whom I have
repaired his television previously passed
by and as we greeted each he mentioned that I really helped him to revive his
dead television.
The shop owner heard the conversation and was interested
to see if I can revive her television which was hit by power surge and decided
to keep it in the store.
I proceeded to my mission and while coming back I found the
lady has already picked the television from the store waiting for me.
I opened the television and since it was hit by power
surge I was much interested on the power supply which always super heavy
casualties once hit by power surge.
First I checked the state of the main capacitor and found
its top part lightly swollen.
With this I concluded indeed this was power surge, sorry I
did not take a photo before removal from the board.
