Summary of PF21500
Page 1
C o l o r t e l e v i s i o n service manual chassis no. Ete-3 please read this manual carefully before service. Pf21500 pf21516s modelno: pf21gb300 李 庆亮 10-11-19, 15:05.
Page 2
1. Safety instructions and maintenance warning: before servicing this chassis, read the “x-ray radiation precaution”, “safety precaution”and “product safety notice”instruction below. 1.1 x-ray radiation precaution 1.1.1 the eht must be checked every time the tv is serviced to ensure that the crt doe...
Page 3
Caution: for your protection, the following product safety notice should be read carefully before operating and servicing this tv set. 1.3.1 many electrical and mechanical components in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a vi...
Page 4
The exterior of the tv set or crt screen. Do not use liquid cleaners or aerosol cleaners. 2. Adjustments 2.1 set-up adjustments the following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in the following order: color p...
Page 5
2.1.2 convergence adjustment preparation: before attempting any convergence adjustment, the tv should be operated for at least 15 minutes. •center convergence adjustment. •receive dot pattern. •adjust the brightness/contrast controls to obtain a sharp picture. •adjust two tabs of the 4-pole magnet t...
Page 6
2.1.3 white balance adjustment generally, white balance adjustment is made with professional equipment. It’s not practical to get good white balance only through manual adjustment. For tvs with i2c bus control, change the bus data to adjust white balance. 2.2 circuit adjustments preparation: circuit...
Page 7
•power on the specific degausser and face it to the tv screen. •turn on the degausser. Slowly move it around the screen and slowly take it away from the tv. •repeat the above steps until the tv is degaussed completely. 2.2.2 confirmation and adjustment for voltage caution: +b voltage has close relat...
Page 8
Test point voltage test point voltage negative of vd49 1 184±3v 14"gs_crt_anode 22±1.5kv 21 "fs_crt_anode 25.5±1.5kv 21 "pf-crt-anode 26.5±1.5kv 21”us crt anode (huafei) 25.5±1.5kv 21”us crt anode (samsung/lg) 23.5±1.5kv heater 6.3±0.3vrms 2.2.4 . Lian grid, focuse of the adjustment and white balanc...
Page 9
Hbow horizental bow correction 32/32 vlin vertical linearity 32/32 vscr vertical scroll 32/32 eww e-w width 53/51 pw e-w parabola width 22/18 page 3 g-2 ucp e-w upper corner parabola 46/37 lcp e-w bottom corner parabola 42/33 tc e-w trapezium 32/32 vsh vertical shift 36/36 va vertical amplitude 22/2...
Page 10
Cof cut-off control range 0 dcxo crystal frequency correcting compensation 2 page 8 other s-video s-video set 0 m-on memory on 1 off-tim e auot off without signal. 0:5 minutes; 1:10 minutes; 2: 15minutes 0 logo-a ct user’s logo setup 1 no-sig have no signal to hint 1 log0 logo color 0 1 log1 logo co...
Page 11
3.1 structue block diagram audio amplifier uoc-top video amplifier h.Out v.Out power supply circuit ir tuner side avin avout rca/scart key 3.2 chassis description 3.2.1 general description ete-3 chassis is applied in ss21gg300a seriers . By use of philips uoc-top for tv small signal processing and b...
Page 12
3.2.3 the chassis mainly uses the following ics and assemblies. P o s i t i o n t y p e d e s c r i p t i o n 1 n 2 0 1 a t 2 4 c 1 6 e e r p o m t d a 1 1 1 x x p s m i c r o p r o c e s s o r , m o n o - 9 0 / m o n o 1 1 0 v e r s i o n s f o r 9 0 ° / 1 1 0 ° p i c t u r e t u b e s 2 n 2 0 2 t ...
Page 13
· only one reference (12 mhz) crystal required for the -controller, teletext- and the colour decoder · multi-standard colour decoder with automatic search system · internal base-band delay line · indication of the signal-to-noise ratio of the incoming cvbs signal · a linear rgb/yuv/ypbpr input with ...
Page 14
Data capture · text memory for 1 page · inventory of transmitted teletext pages stored in the transmitted page table (tpt) and subtitle page table (spt) · data capture for us closed caption · data capture for 525/625 line wst, vps (pdc system a) and 625 line wide screen signalling (wss) bit decoding...
Page 15
4.2.2 features 2 channel se: 1 w to 7.5 w operation possibility soft clipping input clamps volume control standby and mute mode no on/off switching plops low standby current high supply voltage ripple rejection outputs short-circuit protected to ground, supply and across the load thermally protected...
Page 16
4.2.3 pin description symbol pin description in2 1 input 2 out2 2 loudspeaker terminal 2 civ 3 common input voltage decoupling in1 4 input 1 gnd 5 ground svr 6 half supply voltage decoupling (ripple rejection) vc 7 volume control input (standby, mute and volume control) out1 8 loudspeaker terminal 1...
Page 17
Pin symbol description 1 vp1 positive supply voltage 1 2 vp3 flyback generator output 3 vp2 supply voltage 2 for vertical output 4 gnd ground or negative supply voltage 5 v-out vertical output 6 inn inverted input of differential input stage 7 inp non-inverted input of differential input stage 4.4 e...
Page 18
− typical programming time 6ms( high reliability − endurance 106 cycles 1) − data retention 40 years 1) − esd protection 4000 v on all pins 8 pin dip/dso packages available for extended temperature ranges − industrial: - 4 0 t o +85 − automotive: - 4 0 t o +125 4.4.2 pin description serial clock (sc...
Page 19
4.5 switch-mode power supply ic fscq0765rt internal block diagram pin number pin name pin function description 1 drain high voltage power sensefet drain connection. 2 gnd this pin is the control ground and the sensefet source. 3 vcc this pin is the positive supply input. This pin provides internal o...
Page 20
李 庆亮 10-11-19, 15:06.