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Samsung CS-7277P TV, sound normal, red grating and retrace line maintenance method is dim

Time£º2014-08-14 09:50:07  Source£ºNetwork  Author£ºUnknown  Clicks£º1396
  

See this machine in a few minutes can appear normal grating and image, slightly partial color. According to the owner. To get the completed elsewhere. Tube fault repair bad. FPWservice manual download site
 FPWservice manual download site
The author carefully check, tube launches to normal. No touch very; After startup without normal grating measuring tube of red, green, blue three shots of voltage is 188 v or so. Apparently did not work. The original tail plate circuit as shown above. Plug-in CPV01 (3), (4), (5 feet is 0.6 V, three guns are without work, video in the closed position. TDA61010Q 5 feet for the black level detection, tube end plate plugin CPV01 voltage of 3.4 V 1 foot, have normal grating is 6.8 V. From the thought of can improve the problem of voltage on video off the feet? With a 5.6 k Ω resistance of CPV01 (1), (2) feet + 12 v connection, touch and not connected, after kinescope immediately lit up and raster image. Shut down after repeatedly with the resistance to try several times, effect is very good. As long as the tube end plate after the boot (2 pv01 plug-in (1) + 12 v pulse feet, can open video closed. So, the author designed a small circuit to solve the problem (see below). FPWservice manual download site
 FPWservice manual download site
This circuit is divided into two parts: 1, V1, R1, R2, C1 of about three or four seconds delay after delay circuit, V1 conduction; 2, V2, C2, R4, R3, D1 pulse circuit, when the V1 conduction, V1 of collector potential down close to 0 v, the + 12 v voltage by the C2, R4, V1 to V2 launch positive pulse make V2 conduction, instant give CPV01 tail plate (1) the foot a + 12 v pulse, open the video closed state. Practice has proved that the pulse is can't open the video closed are premature. The D1 is used in the power is turned off, C2 by D1, R2, R4 discharge, to prepare for the next boot.FPWservice manual download site