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Thursday, 5 April 2018

BPL COLOUR CTV FXR 13XB1 – DEG/DDG/DSG Fault finding 1

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



Set is in Standby i.e. No Power-On
+5V supply from SMPS is missing, check 5V at pin
no. 52 of IC701, Q701 (2SA1015), R701 (1K5),
D701 (3.6V-zener), R702 (8K2), C702A (0.01MFd),
R703 (4K7), C701-C702 (33pF), X701 (4MHz), no
output from pin no. 8 of IC701, IC701 (MN15287-
9504) def., R721 (10K), R722 (10K), R723 (10K),
Q720 (2SC1815), C371 (0.01 MFd), Q370
(2SC1815), R395 (4702), D791 (1S2471), D315
TLP621-1) & related parts, check power supply

After Switching on the TV Set By Mains
On/Off Switch, TV Starts & Automatically
Goes into Standby Condition

This is called Reset Problem, check Q701
(2SA1015), R701 (1K5), D701 (3.6V-zener), R702
(8K2), C702A (0.01 MFd), R703 (4K7), IC701
(MN15287-9504) defective.

No Operation Through Remote Control
Handset While Handset is OK & Front
Panel Keyboard is Working Normally

Check +5V to IR Sensor A701, no output from IR
Sensor or it is faulty, R718A (15KpF), R774 (220 Ω),
IC701 (MN15287-9504) defective

No Operation Through Front Panel
Keyboard While Remote Control
Operation is OK

Any key in Front Panel Keyboard is def., Front Panel
Keyboard dusty or rusty, check key matrix circuit,
D713-D707-D705-D704-D702 (1S1553 x 5), C701-
C702 (33pF), X701 (4MHz), IC702 (93C66) &
related parts, IC MN15287-9504 & related parts


Volume Up/Dn Function is Not Working
Volume Up/Dn keys SW703/SW704 def., check key
matrix, no output from pin no. 44 of IC701, IC701
(MN15287-9504) def., R739 (33K), R740 (33K),
C718 (3.3MFd), Q435 (2SC1815), IC551 (AN5836)
& related components, fault in Sound PCB

Bass Control is Not Working
No output from pin no. 43 of  IC701, IC701
(MN15287-9504) def, R735 (33K), R736 (47K),
C716 (3.3MFd), IC551 (AN5836) & related
components, fault in Sound PCB

Treble Control is Not Working
No output from pin no. 42 of IC701, IC701
(MN15287-9504) det. R729 (4702), R730 (220K).
R731 (33K), R732 (47K), C714 (3.3MFd), IC551
(AN5836) & related parts, fault in Sound PCB

Balance Control is Not Working
No output from pin no. 41 of IC701, IC701
(MN15287-9504) def., R727 (33K), R728 (68k).
C712 (3.3MFd), IC551 (AN5836) & related
components, fault in Sound PCB

Surround Sound Effect Not Working
No output from pin no. 27 of IC701, IC701
(MN15287-9504) def.. IC531 (uPC1891ACY).
R534 (10K), R533 (1K), C537 (0.01 MFd), C538
(0.1MFd), C539 (2200pF), C540-C541 (0.022MFd),
C542 (1MFd), C533 (0.082MFd). R532 (820K).
C531-C532-C536-C535 (4.7MFd), fault in AV PCB,
IC551 (AN5836) & related parts, fault in Sound
PCB, IC501 (MN1458S) & related parts, IC502
(AN7149) & related parts, fault in Woofer PCB.
 

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