SONY KV32XBR45
FAULT FINDING TIPS
1. CONVERGENCE
SYMPTOM : KV32XBR45 convergence is way
off in the horizontal direction
CURE : Unit has an open R789 a 18 meg 1/2
watt resistor for the Horizontal static convergence. The tech will have to make
a resistor out of 3, 6.2 meg resistors.
2. CONVERGENCE
SYMPTOM: KV32XBR45 Unit has convergence of
all vertical lines are displace horizontally. Tech replaced the CRT without
authorization. This did not solve the symptom
CURE: Suggest tech look for R789 and see if it is open It is on the on
"C" board. It The value is around 10 meg. There are two different
chassis and CRTs used for this model. If they have the older chassis type that
requires H stat convergence (CRT board has H stat control) they need to order
the older CRT as per the manual. If newer type (No H stat) then the new CRT as
per Service Manual supplement -1 is needed. CRT 8-733-743-05 The H Stat is done
using the Yoke ring magnets. I have attached the two Service Manual supplements,
and the SB325R1.
3. CONVERGENCE
SYMPTOM: KV32XBR45 Unit has sever Horizontal
static convergence error. TV cae to us from another shop where the CRT and
flyback was replaced. Customer call us for secont opinion.
CURE: Suggest tech look for R789 and see if it is open It is on the on
"C" board. It The value is around 10 meg. There are two different
chassis and CRTs used for this model. If they have the older chassis type that
requires H stat convergence (CRT board has H stat control) I have attached the
two Service Manual supplements, and the SB325R1. However none of them have show
this resistor. We were able to install a resistor in this unit that was a two
10 megs in series. Trimming the value by adding another 10 meg in parallel with
one of the other 10 megs. we were able to converge the set. Original part was
not available.
4. CONVERGENCE
SYMPTOM: Unit has mis-convergence of red and
blue vertical lines. They are displace horizontally. Tech replaced the CRT
without correcting the symptom.
CURE: R789 open H-state not operational. What I'm finding is a resistor
that appears to be open on this "C" board It is R789 The value cannot
be read nor is it listed in the ESI software parts list. Trying another value
from 10 to 20 megohms. This resistor is in the ground return of the H-stat
resistor that is installed in the CRT. Tech needs to try different values to
try and make this set converge horizontally. This TV converged with a 10 megohm
resistor.
5. CONVERGENCE
SYMPTOM: Unit has nis-convergence of red
& blue vertical lines which are displaced horizontally. Tech replaced the
CRT. This did not solve the problem.
CURE: Suggest tech look for R789 and see if it is open It is on the on
"C" board. The value is around 10 meg. There are two different
chassis and CRTs used for this model. If they have the older chassis type that
requires H stat convergence (CRT board has H stat control) they need to order
the older CRT as per the manual. If newer type (No H stat) then the new CRT as
per Service Manual supplement -1 is needed. CRT 8- 733-743-05 The H Stat is
done using the Yoke ring magnets.
6.DEAD
SYMPTOM: Unit was dead. has shorted
horizontal output and shorted Q601, & Q602 components in power supply
replaced. After replacement unit will turn on but still has no secondary
voltage output of power transformer. All relays click but no high voltage. Has
sound.
CURE: Tech needs to check the condition or RY602. RY602 is the switching
relay that turn on and off the set. The relay is "HOT" switched. In
other words one side of the relay is connected to power oscillator output that
runs nearly 350 vac Peak to Peak at 90Khz. Once the relay is closed this energy
is placed across the power output transformer and provides the drive necessary
to produce the B+.Measuring the input voltage of the relay to "HOT' ground
found it to be 150 volts DC mode. But on the other side of relay we has 3 volts
DC mode. Unit has defective RY602 relay.
7 .GEOMETRY
SYMPTOM : Unit is trying to constantly
adjust the vertical height and horizontal size intermittently.
CURE : When monitoring the E/W Pin output
of the M board the signal was very instable. It was decided to replace IC351
the Jungle IC. This corrected the trouble.
8 . WEAK VIDEO
SYMPTOM : Sony KV32XBR45 Unit has a very
faint picture But the OSD is fine. Problem shows up in the tuner and video
input mode. Tech ordered Q401 but did not correct the symptom
CURE : There is video at the base of Q401
but not at the emitter. Q401 measures 9 volts on all elements. Base must be 4.5
volts. Transistor is in cut off. Bases and emitter are the same 9 volts. Unit
has open R617 a 680 ohm resistor.
