Tandy 1400LT - LCD Check

@ LCD Check
Is monitor switch off?
~~~
Check pin25 of IC30
E"S signal
(Low pulse is output from pin35 of GATE1)
1
Check IC30 and GATE1
I
1 1
Check the LCD reference voltage
A. CN2 : Pin15 t5v
B. CN2 : Pin17 Min. -15V
++, ormal?
A: Check TR1, TR2, Pinl3,12
of IC56 and Pin31 of GATE3.
B: Check TR10, TR11, Pin39
of GATE3, R17, R18, R19,
R20 and IC34.
Check
IC28, IC29 :Video
RAM
IC22-IC25 and IC27
: CGROM
I
Check the waveform
CN2:Pin10-14
1
ICheck Pin7, 9, 14, 16, 181
of IC33, Pin18-21, 54
of IC30.
Q
5-8