Lamp Drive Error ( 5X) (Aka Lamp Power Supply Block) - Sony KDS-R50XBR1 Training Manual

The drive voltages should be 6V each. If both drive voltages are present
replace the non-rotating fan. However, if either of the drive voltages is
missing then there is a defective drive circuit on the ASU-Board. Replace
the ASU/DSU assembly.
Reference Figure 4-1 for fan numbering and CN2301 pin numbering
The other two fans (Fans 2 & 3) are not visually accessible, and therefore,
you will use the DC Fan Drive and Feedback voltages to check fan
operation.
Check the Fan Drive voltages at CN2301/pins 6 & 8.
Check the Fan Feedback at CN2301/pins 5 & 7 on the ASU-Board.
NOTE: Follow the appropriate path on the flowchart for Drive or Feedback
when troubleshooting.
The presence of fan drive voltage confirms that the drive circuits on the
ASU-Board are functioning properly, and confirms that the fan is receiving
its operating voltage.
The level of the feedback voltage confirms that the fan is rotating. The
fan feedback voltage is 0.05V when the fan is rotating (normal operation).
If the fan is not rotating the feedback voltage will be greater than 1V.
Replace the appropriate fan if either feedback voltage is above 1V.
Check Fan Drive (DR)
CN2301/pins 6 & 8 (DR)
CN2301/pins 5 & 7 (FB)
If both feedback voltages are at the proper level then the fans are rotating,
TVP-21
Check Fan Drive
Voltage Levels at
CN2301/pins 2 & 11
*Befroe Shutdown*
and Feedback (FB)
Voltage Levels at
*Befroe Shutdown*
however, the DE microprocessor is not processoring the information
accurately. In this case, the problem is with the DE microprocessor.
Replace the ASU/DSU assembly.

Lamp Drive Error ( 5X) (aka Lamp Power Supply Block)

This error indicates lose of the 12KV High Voltage Output (lamp
ignition voltage) from the lamp driver board. The main objective when
troubleshooting this error is to isolate to one of four areas.
1) The Lamp
2) The Main Power Supply (G-Board)
3) The Lamp Driver Board (Lamp Power Supply Block)
4) The TV Microprocessor (ASU-Board)
A completely open circuited lamp can cause a 5X flash pattern. Therefore,
the very first component to eliminate form the suspects is the lamp.
Does
Spark Gap
Light?
Visually check the spark gap on the lamp driver board for illumination
during TV initial power on process. In normal operation the spark gap
will flash ~5 seconds after the on button is pressed and the Green LED
begins flashing. It should flash once and the lamp will light.
If the spark gap flashes three times with a 20-second pause in
between flashes then the lamp drive is functioning properly, and the
lamp is defective (replaced the lamp).
4. Protection Circuits
5X Flash
Pattern
Lamp Driver
Yes 3 Attempts
20 Sec. Intervals
76