SERVICE MANUAL FOR M35&36; CHASSIS
SERVICE MANUAL FOR M35&36; CHASSIS SERVICE MANUAL FOR M35&36; CHASSIS
TCL Chassis M35&36 Service Manual 6. Vertical output section IC VCT3831A outputs vertical saw-tooth waveform from Pin33. It comes to pin1 of TDA8172 with DC coupling. And it is amplified by inner difference amplifier. Pin7 of TDA8172 is the same phase input terminal. R302 is DC offset resistances. In application to M35, pin7 of TDA8172 is connected with Pin34 vert0. The amplified saw tooth-wave comes out from pin5 and make the deflect coil to generate the deflect current. R307 and C305 filtrate the inductive interference from the horizontal deflect coil. C307 is used to eliminate spurious oscillation generated by the deflect coil and distributed capacitance resonance. R312, R320 and accessory circuit are in charge of draw AC saw tooth wave out, and feedback to the input terminal of TDA8172 (pin1) to correct the linearity of horizontal scan. D302 and C301 make up of a voltage pump up circuit. TDA8172 output a vertical kickback impulse from pin6 to locate the OSD characters. 7. Horizontal Output And FBT Section The processor outputs horizontal drive impulse from pin24 H-OUT. The drive impulse is done with voltage division by R268 and D401, and then comes to the base of the drive triode (Q401). C401 is used to eliminate the noise in the H drive impulse. T402 is a horizontal drive transformer. Q402 is a horizontal output triode with a damper inside. The deflect coil and the horizontal output triode have some resistance R while they are ducting. The resistance R will cause the non-linear distortion, which means that the right direction scanning speed of the electron beam becomes slower, and the right of the raster is compressed to generate distortion. We use a horizontal linear adjuster to compensate this kind of distortion. We use L402 as the H linear adjuster in horizontal scanning section of M35 chassis. R409, which is parallel connected with L402 and L401, is a despiking resistance for preventing the oscillation by compensating inductor and the stray capacitance. The linear adjuster is a transductor coil with a magnetic core inside. If the current, which pass the linear adjuster coil, increase to a certain value, the magnetic core becomes saturated to decrease the inductance of the linear adjustment inductor. If the +B is steady, the increase speed of Iy is faster to compensate the reducing of deflecting current by the resistance R mention above. We can adjust the magnetic core to change the inductance of the linear compensate inductor to adjust the H linearity. M36 Block Diagram (Consult above M35 part for Brief Introduction on Chassis) RF IN TUNER Z101(Z102) SAWFILTER IF AMP M52760 Key Sensor X-TAL 20.25MHz IF IC 201 VCT3831A Video AMP And Sense SCART AV2 IN I 2 C BUS I 2 C BUS 24C16 E 2 PROM Q401,Q402 H DRIVE IC301 V-OUTPUT TDA8172 Hi-POT H-OUTPUT FBT(T401) IC901 MSP3415G/MSP346CG IC602 TDA8944 AC220V DT801 IC801 MC44608 Q801 T802 POWER TRANSISTOR B +, 18V 33V 9V,5V,3.3V 6 03.Mar.2003
TCL PART IV. IC Pin Description 1. MC44608-High Voltage PWM Controller Chassis M35&36 Service Manual Pin Name Description 1 Demag 2 Isense 3 Control Input The Demag pin offers 3 different functions: Zero voltage crossing detection (50mV), 24 A current detection and 120 A current detection. The 24 A level is used to detect the secondary reconfiguration status and the 120 A level to detect an Over Voltage status called Quick OVP. The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the power MOSFET. When Isense reaches 1V, the Driver output (pin 5) is disabled. This is known as the Over Current Protection function. A 200 A current source is flowing out of the pin 3 during the start–up phase and during the switching phase in case of the Pulsed Mode of operation. A resistor can be inserted between the sense resistor and the pin 3, thus a programmable peak current detection can be performed during the SMPS stand–by mode. A feedback current from the secondary side of the SMPS via the opto–coupler is injected into this pin. A resistor can be connected between this pin and GND to allow the programming of the Burst duty cycle during the Stand–by mode. 4 Ground This pin is the ground of the primary side of the SMPS. 5 Driver The current and slew rate capability of this pin are suited to drive Power MOSFETs. 6 VCC This pin is the positive supply of the IC. The driver output gets disabled when the voltage becomes higher than 15V and the operating range is between 6.6V and 13V. An intermediate voltage level of 10V creates a disabling condition called Latched Off phase. 7 This pin is to provide isolation between the Vi pin 8 and the VCC pin 6. 8 Vi This pin can be directly connected to a 500V voltage source for start–up function of the IC. During the Start–up phase a 9 mA current source is internally delivered to the VCC pin 6 allowing a rapid charge of the VCC capacitor. As soon as the IC starts–up, this current source is disabled. 7 03.Mar.2003
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TCL<br />
PART IV. IC Pin Description<br />
1. MC44608-High Voltage PWM Controller<br />
Chassis M35&<strong>36</strong> Service Manual<br />
Pin Name Description<br />
1 Demag<br />
2 Isense<br />
3<br />
Control<br />
Input<br />
The Demag pin offers 3 different functions: Zero voltage crossing detection (50mV), 24<br />
A current detection and 120 A current detection. The 24 A level is used to detect the<br />
secondary reconfiguration status and the 120 A level to detect an Over Voltage status<br />
called Quick OVP.<br />
The Current Sense pin senses the voltage developed on the series resistor inserted in<br />
the source of the power MOSFET. When Isense reaches 1V, the Driver output (pin 5) is<br />
disabled. This is known as the Over Current Protection function. A 200 A current source<br />
is flowing out of the pin 3 during the start–up phase and during the switching phase in<br />
case of the Pulsed Mode of<br />
operation. A resistor can be inserted between the sense resistor and the pin 3, thus a<br />
programmable peak current detection can be performed during the SMPS stand–by<br />
mode.<br />
A feedback current from the secondary side of the SMPS via the opto–coupler is<br />
injected into this pin. A resistor can be connected between this pin and GND to allow<br />
the programming of the Burst duty cycle during the Stand–by mode.<br />
4 Ground This pin is the ground of the primary side of the SMPS.<br />
5 Driver The current and slew rate capability of this pin are suited to drive Power MOSFETs.<br />
6 VCC<br />
This pin is the positive supply of the IC. The driver output gets disabled when the<br />
voltage becomes higher than 15V and the operating range is between 6.6V and 13V.<br />
An intermediate voltage level of 10V creates a disabling condition called Latched Off<br />
phase.<br />
7 This pin is to provide isolation between the Vi pin 8 and the VCC pin 6.<br />
8 Vi<br />
This pin can be directly connected to a 500V voltage source for start–up function of the<br />
IC. During the Start–up phase a 9 mA current source is internally delivered to the VCC<br />
pin 6 allowing a rapid charge of the VCC capacitor. As soon as the IC starts–up, this<br />
current source is disabled.<br />
7 03.Mar.2003
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