Sony BVM-14E1E - PA Board Removal Steps; Circuit Descriptions; BK Board Circuit Details; BC Board Circuit Functionality

2-11. HAand HB Boards Removal (BKM-lOR) ................. 2-10
2-12. HC Board Removal (BKM-lOR) ................................. 2-11
3. CIRCUIT DESCRIPTIONS
3-1. BK Board Descriptions ................................................ 3-1
1-1. BK Select Switch ........................................................ 3-1
1-2. Clamp Circuit (1) ....................................................... 3-1
1-3. W B INSERT Pulse Insertion Circuit ..................... 3-1
1-4. Chroma Level Adjustment Circuit ........................... 3-1
1-5. Matrix Circuit ............................................................. 3-1
1-6. RGB Switch ................................................................. 3-1
1-7. Clamp Circuit (2) ....................................................... 3-1
1-8. Half Blanking Switch ................................................. 3-1
1-9. 100 IRE Pulse, SET UP Pulse Insertion Circuit .... 3-1
1-10. Blue-Only Switch ........................................................ 3-1
1-11. Contrast, Bright Adjustment Circuit ....................... 3-2
1-12. Pulse Insertion Circuit .............................................. 3-2
1-13. Drive Control Amplifier ............................................ 3-2
1-14. Clamp Circuit (3) ....................................................... 3-2
1-15. Cut-Off Switch ..........................................
, .................. 3-2
1-16. VIDEO OUT Amplifier .............................................. 3-2
1-17. G2 Control ................................................................... 3-2
2. ABL, Overload Detection .......................................... 3-2
3. Control Circuit ............................................................ 3-2
BK Board Block Diagram (1) ............................................. 3-3
BK Board Block Diagram (2) ............................................. 3-7
3-2. BC Board Descriptions ................................................ 3-10
1. Serial Communication with Boards ......................... 3-10
2. Internal Signal Generation ........................................ 3-10
3.
vrrc Reading ............................................................. 3-10
4. Character Generator .................................................. 3-10
5. Parallel Remote Control ............................................ 3-10
6. JSR Terminal ............................................................... 3-10
7. Serial Remote Terminal ............................................ 3-10
8. Communication with Control Block (HC Board) . 3-10
BC Board Block Diagram ................................................... 3-11
3-3.
E Board Descriptions ................................................... 3-15
E Board Block Diagram ...................................................... 3-15
1. Horizontal System ...................................................... 3-18
1-1. H DEIAY Circuit ....................................................... 3-18
1-2. AFC Circuit ................................................................. 3-18
1-3. Horizontal Deflection Circuit ................................... 3-18
1-4. H Center Circuit ......................................................... 3-18
1-5. Landing Circuit ........................................................... 3-18
1-6. NTC Drive Circuit ...................................................... 3-18
1-7. H Linearity Circuit ..................................................... 3-18
1-8. Rotation Circuit (20-lnch Model) ............................ 3-18
1-9. H Convergence Circuit (20-lnch Model) ............... 3-18
2. Vertical System ........................................................... 3-18
2-1. V Counter .................................................................... 3-18
2-2. V.OSC Circuit ............................................................. 3-18
2-3. Vertical Deflection Circuit ........................................ 3-18
3. Protection Circuit ....................................................... 3-19
3-1. H.STOP, V.STOP Detection Circuit... ..................... 3-19
3-2. Excessive Current Protection Circuit for
Horizontal Deflection Circuit Power Supply .......... 3-19
4. Control Circuit ............................................................ 3-19
3-4. D Board Descriptions .................................................. 3-19
1-1. Signal Generator (IC105) .......................................... 3-19
1-2. DEFLECTION Generator ......................................... 3-19
1-3. H. CONVER Generator ............................................. 3-19
1-4. D/AConverter· ........................................................... 3-19
1-5. NTC Signal Generation ............................................. 3-19
1-6. H.CONV. SIDE Signal Generation .......................... 3-20
1-7. H.LIN Signal Generation .......................................... 3-20
1-8.
D.F.X Signal, D.F.Y. Signal Generation ................. 3-20
D Board Block Diagram ...................................................... 3-20
3-5. PA Board Descriptions ................................................ 3-23
1-1. High Voltage Regulator Circuit ............................... 3-23
1-2. High Voltage Protector Circuit ................................ 3-23
1-3. High Voltage Current Protector, ABL Circuit ....... 3-23
1-4. Screen (G2) Voltage Regulator ................................ 3-23
1-5. DF Drive Circuit ........................................................ 3-23
PA, PC Board Block Diagram ............................................
3-24
3-6. Power Supply Circuit Descriptions
(G, GA, GB and GC Board) ........................................
3-26
1. RCC Switching Regulator (IC4 and TS) ................. 3-26
2. PFC Switching Regulator .......................................... 3-26
3. PFC OVP Circuit ........................................................ 3-26
4.
5.
6.
Half Bridge Switching Regulator
(Q6, Q7, T4, GA Board IC101, IC102) .................... 3-26
Power Supply Control ............................................... 3-26
PFC Failure Detection Circuit ................................. 3-26
7. OVP (Over voltage protection),
OCP (Over current protection) Circuits
(GB Board) .................................................................
3-26
8. SHUT DOWN Circuit
(Q301 to Q312 of GB Board) ...................................
3-26
9. Encoder (GB Board) ................................................. 3-26
10. CRT Protection ........................................................... 3-26
G, GA, GB, GC Board Block Diagram .............................. 3-27
3-7. Control Unit Descriptions
(BVM-14F5U/14F5E, BKM-lOR) ...............................
3-30
1. Key Scan, LED Lighting ........................................... 3-30
2. Memory Card ............................................................. 3-30
HA Board Block Diagram ................................................... 3-31
HB Board Block Diagram ................................................... 3-31
HC Board Block Diagram ................................................... 3-31
4. ELECTRICAL ADJUSTMENTS
4-1. Basic Adjustments in Replacement of CRT .............. 4-1
4-2. Safety Related Adjustments ........................................ 4-12
4-3. Electrical Adjustments ................................................. 4-16
1. E Board Adjustments ...................................................
4-16
2. BK Board Adjustments ................................................ 4--18
3. BC Board Adjustments ................................................ 4--25
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