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Chassis Part Symbol Defective Circuit CTC211A R25305 Video
Symptom
solution
CTC211A Q22413 DTV306 GCC Focus Screen Bl Parameter 6
Video
Video
DTV306
Video
MMC102 A j25102 MMC102 U22300
Video Video
no video or osd, found R25305 open on the green Kine board replace R25305 no video, no sandcastle from U22407, had horizontal pulse out of pin 15 but not back in on pin 10, found a bad connection at collector of Q22413. Resoldering restored sandcastle to U22300 and the video. resolder Q22413 replace the focus Flickering or fluttering in the video. The tech found that the focus screen assembly was / screen causing the problem, he had replaced the kine driver and the resistors in the abl circuit assembly. The raster has a slight black bar on the right side of the screen .Adjusted Parameter 6 Adjust Parameter slightly up. The unit will default to the 4X3 mode. We had to made the adjustment and 6 slightly up. then get back into the normal mode. At this point we checked all picture modes. No tuner selections, only comp , svhs & vga. Signal type missing from the channel menu. J25102 not plugged in, plug in. NOTE: the set will operate with this unplugged but the RF inputs are missing from the input selection and signal type is missing from the channel menu this plug has the data & clock on it. Plug J25102 in. The picture rolls when the set is cold and the unit may shutdown. The I/O circuit board was sensitive in the area of the video chip. Replace U22300 restored normal operation. replaced U22300 Picture too dark, osd was normal. C22331 was leaky. Found good video on pin 53 of U22300, but dc voltage was only 3.2 volts. Should have been 6 volts. Removed C22331 and voltage came up on pin 53. Installed new cap and restored bright picture. No video or osd. Audio ok. Same on all inputs. Found pulse missing from pin 25 of U22300. Tech said he traced back to horiz sip board and resoldered the board and unit operated ok after that. No video. Replaced U22300 and U13102. Found pin 25 of U22300 at 4v very little signal, pin 24 at .3v very little signal . Found R22306 increased in value. Replaced resistor and video returned.
MMC101 CC C22331 MMC101 horizontal CC sip MMC101 CC R22306
Video
Replace C22331 Resolder horiz sip board
Video
Video
MMC101 u22401
Video
Replace R22306. Cleaning the area around the No video except on the S Video inputs. Monitoring U22401(12,5,2) the video was distorted with a low P-P value. Upon closer observation there was a white sticky subtance IC repaired the set. (contaminated rosin?) spilled around U22401. Intermittent purple cast if you spray akb or t-chip it would straighten out.Found loose solder connections on Q15102 & Q15180 on kine board resolder transistors
MMC101 Q15102
Pix/Pix
MM101
U41275
Picture Tube
No change in the Tilt on the crt. The osd bar is changing. U41275 pins 1,2, and 3 at 23 vdc.
Replace U41275.
MMC101 CC Q15112 MMC101 GCE R15199
Picture Tube Picture Tube
Picture goes white with retrace after about 15 seconds. Found Q15112 had no solder on Resolder the collector. Soldering the collector repaired the set. Q15112 Cycles, Error code 7 , the 12vdc sense from the Kine board was low, found R15199 open on the Kine board. replace R15199