Sanyo DS27214

# Sanyo DS27214 CRT RGB mod

Is it possible to transform a CRT found on the curb into the ultimate retro gaming machine? Let's find out.

This tutorial covers the RGB mod for Sanyo DS27530. These instructions should also work for the below CRTs.

• Sanyo DS27214
• Sanyo DS27530
• Sanyo DS31520
• Sanyo DS27800

Given that this CRT TV solely features one composite input at the front, one composite input, one s-video input, and an RF input at the back, it's certainly worthwhile to modify it for RGB input. Although a few adjustments are required, the modification process employs the standard mux mod.

I discovered this CRT lying next to a community donation bin, where electronics are not permitted to be dumped. Moreover, it was carelessly left on its side in the mud. Despite some minor damage to the plastic lip of the front casing, it was fortunate that the rest of the device remained unscathed. I believe that this CRT was exposed to the rain for a minimum of two days. After contemplating for about 5 minutes, due to the mud on the back, I eventually decided to seize the opportunity and take it with me for some experimentation. Looking back, I'm glad I made that choice.

It's regrettable that this set was abandoned in such a condition. The tube utilized in this set is the same as the ones found in JVC D-Series, and the chassis is quite robust with several advanced protection features. Most notably, it's capable of being modified for RGB input, making it an ideal candidate for such upgrades..!!!

# CRT safety

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

# Specs

# Sanyo DS27214

• Manufactured: Assembled in the USA
• NTSC, 60 Hz
• Chassis: DS27214-00
• Tube: A68ADT25X03 (Bonded Yoke)
• Chroma: LA76834NMP (IC101)
• OSD: QXXAVB927P

# Service manuals

Sanyo DS27214 Service ManualSanyo DS27800 Service Manual

# Schematics

Zoomed in

# Calculating the RGB external resistor value

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

We find out using ohms law, this CRT is using 0.5Vp-p. How?

Vp-p = 5V x (560/(5600+560)) = 5V x 0.0909 = 0.45V

RGB external resistor value
= (0.5 x (5600 + 75) - (75 x 5)) / (5 - 0.5)
= (0.5 x 5675 - 375) / 4.5
= 2462 / 4.5
= 550Ω

560Ω resistors should do the job.

# Performing the mod

Now that you roughly know what needs to be done, prepare for the mod. Place the board on a comfortable place. Make sure you are not putting pressure on the flyback or other components.

# STEP 1: Remove the following components

Remove the following components. RGB resistors to the ground. Measure twice and mark before you remove.

• R842 (560Ω)
• R843 (560Ω)
• R844 (560Ω)

# STEP 2: Connect RGB, Blanking

Refer to the picture below to connect the RGB and blanking wires. Be sure to solder them to the leg of the resistor that is facing away from the OSD chip.

# STEP 3: Blanking diode

To prevent current from flowing back into the OSD and causing interferences in RGB mods, it's necessary to include a diode in the blanking line. The absence of this diode is the main cause of such issues.

# STEP 4: Sync and Audio

Sync and Audio can be connected to Video 2 input. You can also connect sync to the S-Video luma input to reduce the RGB shift.

# STEP 5: Build your mux board

Below mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the precalculated resistor values.

Buy your RGB mux board

Buy your RGB mux board

Although the calculations were helpful, a dedicated tuner board was utilized to identify the optimal combination of RGB inline and termination resistance required to achieve the ideal color balance. After testing, it was discovered that a 220Ω termination provided the finest RGB image.

# STEP 6: Service Menu and User Menu Adjustments

To attain the appropriate equilibrium between composite/s-video input and RGB input, numerous adjustments to both the Service Menu and User Menu were required for this set. Once set, you don't have adjust these when you switch inputs.

The above image also demostrates that RGB/OSD mux is working!

# How to get into the Service Menu

While pressing the MENU key on the front of the TV, reconnect the AC power cord. The Service Menu Display will now appear.

I have only highlighted the values I changed here. You can scroll down to see the full service menu settings details

# STEP 7: Attach the female SCART connector to TV

Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.

How to create and mount a SCART female plug?

# Remote Control for this TV

Despite not having the remote control for this CRT, I was able to use a universal Sony RM-AV3000 remote control with the code 8025 successfully.

# The end

Found a home for this CRT

# Pictures of the mod

# Games

# Patterns

# Chassis, Tube and Casing

Tube label

TV back label

TV full back

TV front buttons

Chassis

Neckboard - component side

Neckboard - solder side

# Service menu settings