How to convert a 13, 19, 20, 21, 25 and 27 inch broken home TV to an arcade monitor or replace a chassis from any low resolution (CGA, used in Cherry master, Mortal Kombat, Ms. Pacman, and most arcades games) :
Note: To do this, you must have knowledge of
electronics since there are more than 20,000 volts on most TV's. I
buy broken TV's in TV Repair Shops for about $10.00 each. Sometimes
they want to get rid of them and they will give them away for free or you
can also find them on the street. Always make sure to
discharge the high voltage on the CRT before removing any wires. Sometimes
the voltage can be present even if they tv have not been ON for a few days.
!!!!!
A good CRT is usually dark gray. If the CRT is brown then the CRT is old and the picture will not be very good.
You can use this inf. to replace a broken chassis from any arcade monitor brand.
CRT means: Cathode Ray Tube. It is the tube or the screen of a TV.To check the size of a monitor you can also measure it, just measure from one corner of the part that shows picture to the opposite corner:
To identify TV size you can look in the back of the CRTwhere you will find some numbers. Between one of the numbers ( after the letter "A") you will find:
51 = 20 inches CRT
48 = 19 inches CRT
63 = 25 inches TV
66 = 26 inches TV
68 = 27 inches TV
34 = 13 inches TV
36 = 14 inches TV
This is
the picture of a Yoke.
The wires
on the Yoke are :
Green and Yellow : for Vertical Deflection & Blue and Red
: for Horizontal Deflection
Note: to
connect the vertical and horizontal connector, choose one of the 2 rows of
pins in the board. Make sure you use one row, don't mix them. The 2 which
are closer is for vertical and the 2 most separated are for Horizontal.If
the screen is upside down or the letters are reverse, swap the 2 vertical
wires or the 2 horizontal until you have a good picture. Don't do it with
while the monitor have power. Example if you think that the vertical is reverse,
swap green and yellow or if it is the Horizontal swap red and blue.
If you are not sure..call me toll free: 1-866-8LINERS
For 13, 19, 20 and 21 inch TV's:
Find a TV. The TV could be a broken one since you are only going to use the CRT with the yoke. The connector for the neck board must be of a specific type and most TV's have this type (see picture below). Measure the ohms of the vertical winding on the yoke (usually Green and Yellow! Red and Blue are horizontal deflection).
The measurements should be between 11 to 17 ohms (Low Impedance) or more than 37 ohms. (High Impedance). You must also note what type of neck board you need: 8 pins or 10 pins.
Look at
this picture : 
This is a 10 pin neck board connector.
After you
have done this, call me or Email me with this information
:
I will then be able to sell you a Chassis that will convert your TV (or replace your Arcade Monitor's Chassis) to an arcade Monitor.Pins: __________________
Vertical ohms ( green and yellow): __________________
Size of CRT: ___________
To replace a monitor:
Install the Monitor and connect the
120 volts wires, if there is not a plug, cut the 2 black wires and connect
it to the 120 volts. The video have a connector wich might not be compatable
so just cut the connector and attach the wires by color: Red with red, blue
with blue, green with green, black with black. If there is only one white
or yellow connect it to the white one, if there are 2 wires, white and yellow,
connect both to the white one ( this is the sync).
Adjust the monitor if necessary.
For 25, 26 and 27 inch Monitor:
You must find a CRT with these specifications:
Measure the vertical ohms, it should be 6 ohms to 12 ohms. Provide the
following information :
Note: if the horizontal ohms is less than 1.5 ohms , take a 5 to 10 watt
1 ohms resistor and add it in serie to the circuit to increase the ohms ....
Red wire: Horizontal : ...............10
watt 1 ohms resistor............to yoke
blue wire: hoziontal: ..................................................................to
yoke
Size
of the CRT: ______________
Vertical
ohms: ________________
All 25
inch or bigger CRT's are 10 pin connector.
Note:To convert our Chassis (13 to 21 Inches)
from High Impedance (40 to 60 ohms) to Low Impedance (11 to 17 ohms), you
must change the parts as outlined in the following table :
|
High Impedance | Low Impedance |
| C412 | 220 uF / 50v | 470 uF / 50v |
| R402 | 3.3K ohm | 1.2K ohm |
| R420 | 5.6 ohm | 3.3 ohm |
Specifications :
------------------------------------------------------------------------------------------------
DEFLECTION YOKE MATCHING IMPEDANCE :
HORIZONTAL :
LH 1.9 MH
RH ~2.2 OHM
VERTICAL :
LV 116 MH
RV~ 54.4 OHM, RV ~13 OHM
INPUT VOLTAGE : AC 110 VAC 50/60 HZ
POWER CONSUMPTION : 50 WATTS
INPUT SIGNAL : R.G.B POSITIVE POLARITY 2.5~5.0VPP
SYNC SIGNAL : H/V COMPOSITE NEGATIVE 2.5~5.0VPP
MATCH SOCKET : 1.2,3,4
H-FREQUENCY : 15 KHZ
V-FREQUENCY : 60 HZ
BANDWIDTH : 8 MHZ
CONNECTOR : 5 PIN (R.G.B,GND,SYNC)
DIMENSION(mm) : L265×W200×H130
WEIGHT : 1.5 KGS/PC
PACKING : 12 PCS PER CARTON(N.W 19 KG G.W 22 KG)
PER CARTON : L63×W49×H53 CM
Chassis prices go from $65.00 (13, 19 inches) to $95.00 (25, 27 inches) brand new.
Questions
? You@writeme.com
