Many of the later model Sony TV’s have a built in self-diagnosis
function. If the timer/standby indicator is blinking, this could be an
indication of a problem with the unit. The diagnostic blinking will
occur automatically with no action required by you to engage it.
The
timing of the blinking you see would be as follows: two to nine blinks,
(depending on the fault), about a third of a second apart, then a pause
for 3 seconds, then the two to nine blinks about a third of a second
apart again.
Here is a list of the problems that might have
occurred indicated by the number of blinks. The words in parentheses
are those, which you will see for each of these faults on a diagnosis
screen described later in this article.
- Unit is dead, No blinks - Problem in the standby power section. Might check fuse, R607, Q601, IC601, R612 and VDR601 (should show open).
- Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.
- One blink - not used for the self-diagnosis
- Two blinks
- B+ over current protection (OCP), unit goes to the standby mode then
displays the 2 blink fault. Could be a short in the power supply of any
of the circuits.
- Three blinks - B+
over voltage protection (OVP), unit goes to the standby mode then
displays the 3 blink fault. This is also a problem in the power supply
circuit, check T603 and R672.
- Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505
- Five blinks
- AKB circuit (automatic kine bias), the timer/standby indicator blinks
for about 30 seconds then goes to the self-diagnosis function.
Something is wrong with the video. Check video out, Q705, 732, 761 and
other components on the C board, also check Q218, 219, 220 on the A
board. In addition, unit could be in IK blanking, try turning up screen
slightly.
- Six blinks - No Horizontal
(H STOP), no raster, goes to the blinking self-diagnosis function
immediately. Check C515 & 516 and the jungle IC, IC206.
- Seven blinks
- High voltage shutdown. The high voltage has exceeded 33k and the unit
goes immediately into safety shutdown. Check power supply regulation
and horizontal circuits.
- Eight
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blinks
- Problem with the audio (AUDIO), unit goes to standby and blinks the
self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some
projection models of Sony TV sets, this code means that T8005 (flyback
transformer), or the associative components in the high voltage
circuits are defective on the D board.
- Nine blinks
- Replace D 6116 and D 6301 on the "G" board, do not resolder as this
will fix the problem temporary. Or Panel Module Error or Thermal Error.
If it is intermittent 9 blinks, meaning sometimes the TV comes on and
other times you get flashing, then change the switching regulator on
the "G" board or check connections. Make sure the regulator is -12 or
-13 (negitive).
- Ten blinks -
Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on
the " D" board. If the transistors are bad, check R8051 and IC8005,
also on the "D" board.
Intermittent problems? This
is a great feature. You can also bring up these fault codes on-screen
to see a list of the problem numbers with the abbreviation of the
problem and the number of times this problem has occurred. This is
slightly different than entering the service mode. To see the
diagnostic screen, press the following buttons: Display, Channel, 5,
volume Minus, ( not plus ) then Power. This brings up a screen with a
list of the problems and number of times they have occurred. Each of
the problems named, are abbreviated as, "OCP", "OVP", "V STOP", ETC. We
have repeated them in parentheses in the text for the "Blinks"
described above so you can correlate between the diagnostic screen and
the blink codes.
Now that you know about these
self-diagnostics, how do you use them? Say that you have a set with a
black screen. You see that the LED is blinking four times. This would
tell you that you have no vertical sweep, which is why the video is
muted. If it was blinking 6 times, you would know that you have a
horizontal fault. It's not a sure cure..
IMPORTANT: After you repair the unit, you
MUST
clear the values on this diagnostic screen. These codes do not reset
themselves after the fault is corrected, so if you don't clear them,
you'll be seeing "old" fault codes the next time you enter this screen.
Clearing is done by going into the service mode (display, channel, 5,
volume plus, then power ). Press 8 and Enter, which returns everything
to the factory preset condition.
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