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Sanyo DS27214

SuntharAbout 6 minCRT RGB mod

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

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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.

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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

Caution

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

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 Manual

Schematics

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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

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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)

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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.

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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. img

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. img

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

On Sanyo CRT ChassisDS27214
CRT RGB inline resistor5.6kΩ
CRT RGB ground resistors removed560Ω
CRT RGB inline cap value0.1uF
Add blanking diode on chassis?Yes
RGB mux boardDS27214
Use RGB inline diodes on CRT chassis?No
Mux board Audio LR (R7, R8)1kΩ
Mux board RGB termination (R1, R2, R3)220Ω
Mux board RGB inline resistors (R4, R5, R6)560Ω
Mux board blanking diode (R9)1N4148
Mux board blanking ground resistor (R10)1.0kΩ

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.

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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.

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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

NO.TITLESANYOADJUSTEDRANGE OF DATAFUNCTION
3HP11150~31Horizontal Centering
4VS66690~127Vertical Size
15RB122000~255Red Bias
16GB01800~255Green Bias
17BB21790~255Blue Bias
18RD75550~127Red Drive
19GD1160~15Green Drive
20BD73590~127Blue Drive
21SBI48550~127Sub Bias
22OSD310~3OSD Contrast
37AF100, 1Auto Flesh
53SB2400~63Sub Bright
54SCO14140~31Sub Color
55STI24200~31Sub Tint

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.

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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 img

Pictures of the mod

Games

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Patterns

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Chassis, Tube and Casing

Tube label img

TV back label img

TV full back img

TV front buttons img

Chassis img

Neckboard - component side img

Neckboard - solder side img

Service menu settings

NO.TITLESANYOADJUSTEDRANGE OF DATAFUNCTION
1HFR290~63Horizontal Frequency
2AFC00, 1AFC Gain & Gate
3HP15150~31Horizontal Phase (Horizontal Centering)
4VS66690~127Vertical Size
5VPO50~63Vertical Position
6VSP00, 1Vertical Set Up (Sync Sensitivity)
7VLN150~31Vertical Linearity
8CRS00~3Cross B/W
9GRY10, 1Gray Mode
10VSC130~31Vertical S Correction
11HBR30~7H BLK R
12HBL30~7H BLK L
13CDM00, 1C D Mode
14VC70~7Vertical Compression
15RB122000~255Red Bias
16GB01800~255Green Bias
17BB21790~255Blue Bias
18RD75550~127Red Drive
19GD1160~15Green Drive
20BD73590~127Blue Drive
21SBI48550~127Sub Bias
22OSD310~3OSD Contrast
23POS00, 1Pre/Over SW
24FLS10~7Filter System
25CKO30~7Color Killer Operation
26GYA00, 1G-Y Angle
27CRG20~3Coring Gain
28PRE30~3Pre Shoot Adjust
29WP10, 1White Peak Limiter
30FSW00, 1FBP Blanking Switch
31VBL00, 1Vertical Blanking Switch
32BSG20~3Black Str Gain
33BSS00~3Black Str Start
34DCR10~3DC Reset
35YGM10~3Y Gamma
36CBP00, 1C Bypass
37AF100, 1Auto Flesh
38BAT40~7Bright ABL Threshold
39MSD00, 1Mid Stop Def
40ABL00, 1Auto Bright Limit
41RYA20~15R-Y/B-Y Angle
42RAD400~63RF AGC Delay
43IAS00, 1IF AGC
44FMM00, 1FM Mute
45FL150~31FM Level
46VL00~7Video Level
47EWD00~63EW DC
48EWA00~63EW Amp
49EWT00~63EW Tilt
50EWP00~7EW Corner Top
51EWB00~7EW Corner Bottom
52HSC70~7Horz Size Comp
53SB2400~63Sub Bright
54SCO14140~31Sub Color
55STI24200~31Sub Tint
56SSH120~31Sub Sharpness
57OPT1000~255Option (See Note 1 page 6.)
58OP2320~255Option 2 (See Note 2 page 6.)
59HR220~63OSD Horizontal Position
60ATT70~63Input Level
61WDB350~63Wideband
62SPC120~63Spectral
63SBO50~255Sub Bright Offset
64PCO400~63PIP Color
65PTI400~63PIP Tint
66PUV240~63PIP Top Position
67PDV1470~255PIP Bottom Position
68PLH100~63PIP Left Position
69PRH1010~255PIP Right Position
70PCN520~63PIP Y Level
71PBS150~63PIP BGP Phase
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