Service manual

20
29H-FG5RU
20-1
20-2
TROUBLE SHOOTING TABLE (Continued)
Normal
No snow noise.
Check pin 104 & 105 of IC2100.
Abnormal
A
Noise or signal appear.
Does AV input at AV1, AV 2 & AV 3 normal ?
Check IC 2100 and its related circuits.
Check TU 51 (Tuner), SF 202 and its related circuit.
Yes
No
Check pin 71, 74 & 78 of IC 2100. Does signal or noise appear ?
Check IC 2100 RGB out at pin 42, 43 & 44. Is the output normal ?
Yes
No
No
Check circuit between AV-in terminal and pin 71, 74 & 78 of IC 2100.
Check IC 2100 and its related circuit.
Check IC 850 at input pin 1, 2 & 3 and its related circuit.
Check the related circuit of screen heater (FBT) and the CRT.
Does signal output at pin 7, 8
& 9 of IC 851 normal ?
Yes
No No
TROUBLE SHOOTING TABLE (Continued)
No
Adjust the colour control at the user MENU. Does colour appear ?
NO SPECIFIC COLOUR
B
Is only RF signal’s colour abnormal?
Set colour control.
Go to CHANNEL SETTING at the user MENU and change to the appropriate colour system. Does the colour appear ?
Set the appropriate colour system.
Check IC 851, IC 2100 and its related circuit.
Check tuner TU 51, SF201and its related circuit.
Yes
Yes
Yes
No
No
Using a PAL colour bar signal, check the RGB in & out line between IC 2100 and IC 851. Does the waveforms normal ?
No
NO COLOUR
COLOUR PRODUCED