SONY TRINITRON COLOR TVs - STANDBY LIGHT BLINKING CODES
BLINKING CODES
- 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.
- 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 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 re-solder 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 (negative).
- 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.
One blink is not used for self diagnosis.
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.
