Recreation of VGA module PCB for Loewe TVs with Q2300 chassis.
Loewe Q2400/Q2500 Chassis VGA Module
Project based on schematic from Loewe Q2300 Chassis Service Manual
Schematic and PCB recreated from the scratch in KiCad and verified with Desing/Electrical Rules Checker tools.
Original schematic from Loewe Q2300 Chassis Service Manual:
Recreated schematic and PCB:
VGA connector breakout board:
| Reference | Value | Footprint | Qty |
|---|---|---|---|
| C3,C5,C7 | 4.7u | Capacitor_SMD:CP_Elec_6.3x5.4 | 3 |
| C4,C6,C8,C14 | 100n | 0805 | 4 |
| C9,C26 | 22n | 0805 | 2 |
| C10 | 1u | Capacitor_Tantalum_SMD CP_EIA-3216-18_Kemet-A_Pad1.58x1.35mm_HandSolder |
1 |
| C13 | 100u | Capacitor_SMD:CP_Elec_6.3x5.7 | 1 |
| C15,C18,C19,C20,C21,C22,C24 | 10p | 0805 | 7 |
| C25,C28,C29 | 100p | 0805 | 3 |
| J1 | VGA DSUB-15 | DSUB-15-HD_Male_Horizontal_P2.29x1.98mm EdgePinOffset3.03mm_MountingHolesOffset4.94mm |
1 |
| J2 | JST XH 10 pin Horizontal | JST_XH_S10B-XH-A_1x10_P2.50mm_Horizontal | 1 |
| L1 | 4u7 | Inductor_SMD:1206 | 1 |
| Q1,Q2,Q3,Q4,Q5,Q6,Q10,Q14 | BC847B | SOT-23 | 8 |
| R1,R6,R13 | 75R | 0805 | 3 |
| R2,R5,R7,R10,R14,R18,R19,R26,R32 | 47K | 0805 | 9 |
| R3,R8,R15 | 22K | 0805 | 3 |
| R4,R9,R17,R33,R34 | 100R | 0805 | 5 |
| R22 | 10K | 0805 | 1 |
| R25,R31,R35,R40,R43 | 1K | 0805 | 5 |
| U1 | 74HCT86 | SO-14_3.9x8.65mm_P1.27mm | 1 |
| W2 | JST XH 10 pin Vertical | JST_XH_B10B-XH-A_1x10_P2.50mm_Vertical | 1 |
| W3 | JST XH 10 pin Vertical | JST_XH_B10B-XH-A_1x10_P2.50mm_Vertical | 1 |
+Cables XH 10 pin 20 + 30~50 cm, connectors: same side
Project split to 2 PCBs which should be ordered separately. Send "gerbers\Breakout Board" and "gerbers\Main Board" folders content packed to separate zip archives.
L1 inductor can be replaced with 0R resistor or solder bridge.
Pay attention on cables connectors type: same direction or reverse direction.
https://www.youtube.com/watch?v=7eVl5yn5JIE:
Select VGA input:
@djcalle1975:
On the Q23 you have to navigate to channel 196 and if no input is detected within 10 seconds the TV will default back to the last used channel.
VGA Geometry menu:
@peteagas:
If there is no VGA menu for you on a Q23 after installation and after enabling the option byte setting, press the "i" on the Loewe remote then go to select control level then simple control level set to "No". VGA geometry will now be available to use.