# JVC iArt AV-14F704 CRT RGB mod

This tutorial covers the RGB mod for JVC AV-14F704. Please follow the Toshiba 14AF43 RGB mod for any missing details. This JVC iArt series and Toshiba AF series internals (Orion tube/main board) are more or less the same.

# CRT Safety

DANGER

You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.

READ THIS BEFORE CONTINUING

# Plan of attack

READ THIS TO PREPARE

# Theory

Sometimes it is nice to know the theory behind the mod. I have put this on a separate page. This shows how the various resistor values are calculated.

READ THE RGB MODDING THEORY

# Service Manuals

Note: the service manual for this TV doesn't seem to have the schematics.

# Schematics

I couldn't find the schematics for this TV. I just followed the Toshiba 14" schematics as they were more or less the same.

# AV-14F704

If you are building your own circuit, this diagram should help img

# Calculating the RGB external resistor value

Love it when we can put theories to use! Formula from our theory page!

img

External resistor value = 0.7 x (4700 + 75) - (75 x 5) / (5 - 0.7) = (3342 - 375) / 4.3 = 690 ohm

This is very close to the grounding resistor value we removed. This should be the case for this particular type of CRTs.

# Performing the mod

Please follow the Toshiba 14AF43 RGB mod

# Service Menu Settings

NUM SETTING VALUE FIXED
00 OSD 6 DEFAULT
01 DEFAULT
02 H VCO 4 DEFAULT
03 H PHASE 11 DEFAULT
04 AFC GAIN 6 DEFAULT
05 V SHIFT 0 DEFAULT
06 H.SIZE 0 DEFAULT
07 V.SIZE 28 DEFAULT
08 V.LIN 22 DEFAULT
09 VS.CORR 42 DEFAULT
10 R.DRV 66 DEFAULT
11 B.DRV 71 DEFAULT
12 R.BIAS 127 DEFAULT
13 G.BIAS 152 DEFAULT
14 B.BIAS 151 DEFAULT
15 BRI.MAX 150 DEFAULT
16 BRI.CENT 62 DEFAULT
17 BRI.MIN 50 DEFAULT
18 CONT.MAX 102 DEFAULT
19 CONT.CENT 50 DEFAULT
20 CONT.MIN 18 DEFAULT
21 COL.MAX 90 DEFAULT
22 COL.CENT 61 DEFAULT
23 COL.MIN 00 DEFAULT
24 TINT 54 DEFAULT
25 SHARP 35 DEFAULT
26 CB DL 0 DEFAULT
27 CR DL 0 DEFAULT
28 CB PED 8 DEFAULT
29 CR PED 8 DEFAULT
30 PARABOLA 31 DEFAULT
31 CORNER 31 DEFAULT
32 TRAPEZIU 31 DEFAULT
33 LEVEL 21 DEFAULT
34 SEP1 8 DEFAULT
35 SEP2 30 DEFAULT