Trouble Shooting; Checking For No Picture - HP PL4260N Service Manual

1. Checking for No Picture

A screen doesn't display at all and condition of black pattern or power off.
(1) Check whether the CTRL B/D LED(D12, D13, D14) is turned on or not.
(2) Check the power and signal cable of CTRL B/D.
(3) X B/D, Y B/D, Z B/D is well plugged in.
(4) Check the connection of X B/D, Y B/D and Z B/D to CTRL B/D.
(5) Measure the output wave of X, Y, Z B/D with oscilloscope(more than 200MHz)
and find the trouble of B/D by comparing the output wave with below figure.
- Measure Point fo Y B/D : TP(Waveform on Y DRV B/D)
- Measure Point fo Z B/D : TP(Bead B28)
(6) Check the SCAN(Y side) IC
(7) Check the DATA(X side) TCP IC
(8) Replace the CTRL B/D.

. Trouble Shooting