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.
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.
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.
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.
I got a phone call from a client who wanted his machine checked by a technician.
He told me that he just googled technician nearby and my
name popped up.
I asked him the nature of the problem and item to be
checked, He said he suspect power surge since the home theater and microwave
are dead.
I asked for the model of the home theater so that I can
prepare myself in advance.
The machine model was the Sony HBD-DZ950, I logged on the
net looking for the service manual of this machine so that I can be able to
figure out the most likely culprits and value.
I was lucky to get the manual and went straight to the
power supply section and was able to pick out the possible culprit which normally
fail if there is power surge.
I picked the components from my store and headed to the
client site which was around 20Km from my place, using the pin location
provided, I was able to locate the place effortlessly.
I was ushered in and shown the machine, after opening it I
could see the damage done by the power surge without even pulling the meter.
I received a phone call from a client who wanted his television checked.
I arrived at the site and
shown the television, looking at the screen one can see the pictures but pink
color was too much and also the image was not sharp, any writing on the screen
was not visible and looked like washed out.
I took the television to the shop and the first stop was the small CRT neck board shown below.
I got direct message on my FB account from a lady who wanted her television checked.
By the way we are not friends on FB but mutual friends and
one of his friends complained about how is new television is misbehaving, I
dropped a comment there and when this lady read my feedback she thought I can
help in her case.
After contacting me we organized for the appointment for the
site visit.
She provided her pin location and was able to reach her place
effortlessly.
I was shown the television and I tried to reset (which the
medical people call resuscitation) all in vain.
I went online and googled the model number then motherboard
and I got the part was available at Aliexpress.com
I asked her if she was comfortable with board price and she agreed.
