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Thursday, 5 April 2018

BPL COLOUR CTV FXR 13XB1 – DEG/DDG/DSG Fault Finding 2

Using IC MN15287-9504 as Microprocessor IC, 93C66 as Memory IC, AN5071 as Band Selector IC, KA2919
as Video IF & Sound IF IC, AN5601K as Luminance, Chrominance, Sync Separator, Horiz. AFC, Horizontal &
Vertical Oscillator & Pre-Amp./Drive. IC, AN5521 as Vertical Output IC, Opto-Coupler & 4 Transistors in
Switched Mode Power Supply
IC HCF4053 x 2 as Internal/External TV/AV Switching ic, μPC1891ACY as Surround Sound Control IC,
AN5421 as Sync Detector IC along with 8 Transistors in AV PCB
IC AN5836 as Dual Channel Audio Amplifier With Volume, Bass, Treble & Balance Control, AN7149 as Dual
Channel Audio Amplifier in Sound PCB.
IC MN1458S as Woofer Control IC & IC AN7149 as Woofer Audio Amplifier IC in Woofer PCB




Program Up/Dn Function is Not Working
Program Up/Dn keys SW701/SW702 def., check
key matrix circuit, D713-D707-D705-D704-D702
(1S1553 x 5), C701-C702 (33pF), X701 (4MHz),
IC702 (93C66) & related components, IC701
(MN15287-9504) & related components

Sharpness Control is Not Working
No output from pin no. 45 of IC701, IC701
(MN15287-9504) def., R741 (2K2), R743 (33K),
R742 (22K), R744 (1 K5), IC201 (AN5601K)

Contrast Control is Not Working
No output from pin no. 46 of IC701, IC701
(MN1 5287-9504) def., R745 (8K2), R747 (20K),
R746 (10K), R748 (10K), C722 (1MFd), C211
(1 MFd), IC201 (AN5601h)

Colour Control is Not Working
No output from pin no. 47 of IC701, IC701
(MN15287-9504) def., R749 (8K2), R751 (27K)
R750 (15K), R752 (10K), C724 (1MFd), IC201
(AN5601K) & related components

Brightness Control is Not Working
No output from pin no. 48 of IC701, IC701
(MN15287-9504) def., R753 (15k), R755 (18K)
R754 (2K7), R756 (10K), C726 (1MFd), VR261
(50K), R213 (560Ω), IC201 (AN5601 K)

No OSD While Functions Are OK
L702 (22 H), C706 (33pF), C707 (47pF), no output
from pin no. 31, 32, 33 & 34 of IC701, IC701
(MN15287-9504) def., check circuit related with
these pins of IC701, IC201 (AN5601K) defective.

Only Red Colour OSD is Missing
No output from pin no. 33 of IC701, IC701
(MN15287-9504) def., R287 (6KB), R284 (2K7)
C280 (0.47MFd), IC201 (AN5601K)

Only Green Colour OSD is Missing
No output from pin no. 32 of IC701, IC701
(MN15287-9504) def, R285 (6K8), R282, (2K7)
C284 (0.47MFd), IC201 (AN5601K)

Only Blue Colour OSD is Missing
No output from pin no. 31 of IC701, IC701
(MN15287-9504) def. R281 (6K8), R280 (2K7),
C283 (0.47MFd), IC201 (AN5601K)

No OSD Blanking While Red, Green &
Blue OSD is OK

No output from pin no. 34 of IC701, IC701
(MN1 5287-9504) def., R610 (22K), R288 (12K),
R289 (3K9), IC201 (AN5601K).
No Band Switching
No output from pin no. 10, 11 of IC701, IC701
(MN15287-9504) def., R769-R763 (4K7), check
supply at pin no. 6 & 9 of IC703, IC703 (AN5071)
def, L106 (10μΗ), C1 01-102-103 (4.7 MFd), tuner.

No Tuning
No output from pin no. 39 of IC701. IC701
(MN15287-9504) def., C706A (150pF), R713 (4K7),
C708 (180pF), R715 (33K), R716 (27k), D721
(1S1553), L701 (10μH), R711 (10K2W), IC311
(33V-zener), C711 (4.7MFd), R717 (12K), Q711
(2SC1815), R718 (22K, C709 (0.1 MFd). R719
. C710 (0.1 MFd), R720 (22K), C770
(0.1MFd), C104 (0.47MFd), tuner defective




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