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Sunday, 1 April 2018

BPL LCR 18CB1 FAULT FINDING - 3


No OSD While Functions Are OK
L761 (15μΗ), C761-C762 (18pF), check Horiz. &
Vertical Blanking to IC701, R486-R487 HU, A763
(47K), R764 (1K2), R762 (10K), Q764 (2SC1815),
C759 (4K7pF), D764 (1N4148), R770 (10K, no
output from pin no. 22, 23, 24 & 25 of IC701, IC701
(PCAB4C444P) def., R758-R761 (3K9 x 4),
R291-R293 (470Q x 3), R294 (1K), C281-C283
(0.1MFd x3), IC101 (TDA8360) defective

Only Red Colour OSD is Missing
No output From pin no. 22 of IC701, IC701
(PCABAC444P) det., R758 (3k9), R293 (4702),
C283 (0.1MFd), IC101 (TDAB360) defective.

Only Green Colour OSD is Missing
No output From pin no. 23 of IC701, IC701
(PCA84C444P) def.,
C282 (0.1 MFd), IC101 (TDA8360) defective
R759 (3kg),
R292 (470Ω).

Only Blue Colour OSD is Missing
No output From pin no. 24 of IC701, IC701
(PCAB4C444P) def., R760 (3K9), R291 (470Ω)
C281 (0.1 MFd), IC101 (TDA8360) defective

No On-Screen-Display Blanking While
Red, Green & Blue OSD is OK

No output from pin no. 25 of IC701, IC PCA84C444
def., R781 (3K9), R294 (1K), IC101 (TDA8360) def.
OSD Jitters (Jumping)
R763 (47K), R764 (1K2), R762 (10K), Q764
(2SC1815), C759 (4K7pF), D764 (1N4148), RT70
(10K), C701 (PCA84C444P) defect

No Auto Tuning or Auto Search
Check Transmission Identification signal at pin no
34 & AFC signal at IC701, no output of Identification
signal from pin no.4 or AFC signal from pin no. 44 of
IC101, IC101 (TDA8360) def., C132 (0.1MFd), R781
(100K), R782 (150K), C126 (1000pF). R129 (100K)
A128 (100K), R736 (47K), c736 (0.1 MEd), Q736
(2SC1815), R737 (4KT), R738 (22K), IC701
(PCA84C444P) def., also check Tuning Voltage"
circuit related with pin no. 1 of IC701

Band is Not Switching
Key for Band selection is def., check key matrix, no
output from pin no. 7, 8 of IC701, IC PCA84C444P
def., D733-D731 (1N4148), R743-R742 (4K7)
R747-R744 (4K7), Q747-0744 (2SC1815), A748
R745 (4K7), R749-R746-R740 (10K), Q753-0748-
Q745 (2SA1015), D753-D754-D755 (1N4148,
L104 (10μ ). C103-102-104 (4.7MFd),tuner def

Timer Function is Not Working
IC701 (PCA84C444P/255) defective

Total Sync Loss, Sound Normal
Q1 15-0121 (2SA1015) &related part,IC TDA8360
Horiz. Rolling or Diagonal Bars, Sound OK
C403 (4700pF), C404 (1MFd), R405 (22k), R406
(22K), R408 (100Ω), VR401 (10K), R407 (390K),
C405 (2700pF), R436 (15K), D443 (9V1-zener
R411 (22K), IC101 (TDA8360) defective

Vertical Rolling, Sound Normal
R402 (1M), C402 (0.022MFd), IC101 (TDA8360)

Horizontal Line, Sound Normat
Check 84/36V to Vertical Output, D457 (1N4007),
R459 (2K7), C359 (47MFd), D458 (1N4007), R453
(4.7Ω), R457 (820). C453 (390pF), C454 (82KpF)
Q456 (2SC1815), Q457 (BD240C), Q458
2SD1266), C452 (22KpF), vertical deflection coil or
its wire, R458 (470 Ω), C463 (47KpF), C461
(1000MFd), R462 (1.8Ω), R461 (109..-C462
(10MFd), R483 (5KB), R464 (3K9) VR461 (2000),
C455 (0.47MFd), R454 (18K/22K), R450 (4K7)
R401 (100a), R404 (100a), C402 (0.022MFd)
C401 (0.1MFo), R402 (1M), IC101 (TDA8360),
Servic
e Switch at wrong position

Height Less or Vertical Non-Linearity or
Vertical Fold-Over Problem, Sound OK

Adjust & check VR461 (2004), less or abnormal
B4 36V to Vertical Output, D457 (1N4007), R459
(2K7), C359 (47MFd), D458 (1N4007), R458 (4.70)
R457 (820), C453 (390pF), C454 (82KpF), Q456
(2SC1815), Q457 (BD240C), Q458 (2SD1266),
C452 (22KpF), R458 (4700). C463 (47KpF), C461
(1000MFd), R462 (1.8Ω), R461 (10K), C462
(10MFd), R463 (5K6), R464 (3Ke), C455 (0.47MF)
R454* (1 8K/22 K), R450 (4 K7), R401 (1000), R404
(1002) C402 (0.022MFd), C401 (0.1MFd), R402
(1M), IC101 (TDA8360), vertical defilection coil

No Audio, No Audio, Picture Normal
D355 (EU2), C365 (2200MFd), C192 (0.1MFd)
C191 (470MFd), speaker or its wire, C176
(470MFd), C175 (0.1MFd), R175 (102), C172
(1KpF), C174 (22MFd), IC171 (TDA2611A), C171
(1 MFd), C177 (4K7pF), R170 (12K), J170, IC101
(TDA8360) &related components
No Sound, Audio & Picture is OK
Q115 (2SA1015) & related components, C141
(56pF), R143 (47Ω), R144 (330Ω), X141 (5.5MHz)
R145 (47K), check as given in fault of Volume+/-
Function is Not Working", C125 (1MFd), C122
o.1 MFd), R125 (180n), C123 (10MFd), IC101
TDA8360), J170, R170 (12K), R172 (2K2), C177
(4K7pF), C171 (1MFd), IC171 (TDA2611A) &
related components
 

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