18
TPT1.2A LA
5. Service Modes, Error Codes and Fault Finding
3.No picture/LED is green
Check
scaler board U102
pin1=14V,pin4=1.22V,
pin7=16V,pin8
=5V
No
Check power
Yes
Check if
working voltage
U152,pin2=3.3V
pin3=5V
No
Check circuit around
each regulator and
eliminate short and
open situation
Yes
Check if clock
source X350
Replace X350
No
Yes
Check if
RGB,clk,H/V and
DE signal output 128
bits TTL
No
Try to replace
flash Rom
EEPROM
Check
resistors-network
No
Replace bad resistors-
network
Yes
Yes
Replace LVDS cable
Summary of Contents for 37PFL7422/79
Page 44: ...Scaler Board Layout Top Side Part 1 44 TPT1 2A LA 7 Circuit Diagrams and PWB Layouts ...
Page 45: ...Scaler Board Layout Top Side Part 2 45 TPT1 2A LA 7 Circuit Diagrams and PWB Layouts ...
Page 46: ...Scaler Board Layout Top Side Part 3 46 TPT1 2A LA 7 Circuit Diagrams and PWB Layouts ...
Page 47: ...Scaler Board Layout Top Side Part 4 47 TPT1 2A LA 7 Circuit Diagrams and PWB Layouts ...
Page 66: ...66 TPT1 2A LA 7 Circuit Diagrams and PWB Layouts Key Board Layout Bottom Side ...
Page 82: ...82 TPT1 2A LA 9 Circuit Descriptions Abbreviations List and IC Data Sheets ...
Page 83: ...83 TPT1 2A LA 9 Circuit Descriptions Abbreviations List and IC Data Sheets ...
Page 84: ...84 TPT1 2A LA 9 Circuit Descriptions Abbreviations List and IC Data Sheets ...
Page 85: ...85 TPT1 2A LA 9 Circuit Descriptions Abbreviations List and IC Data Sheets ...
Page 89: ...89 TPT1 2A LA 9 Circuit Descriptions Abbreviations List and IC Data Sheets Pin assignment ...