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Thursday, 5 April 2018

BPL FXR 13XB1 – DEG/DDG/DSG Fault Finding -4


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




Switching Transistor Q313 (BU508AP)
Overheats or Blows off

Check Q313 (BU508AF) & its mica insulation, C334
470pF). C307 (220MFd/400v)
R4N), C303-C306 (1000pF)
(100pF/1Kv), C313 (4700pF), c331 (470pF/400V)
C317 (0.022MFd), 0312 (2SC3807), C315
(0.012MFd), C314 (0.039MFd), D316-D314
(1S1553), D317 (ES1), 0316 (1000pF), Q311
(2SA1015) & related components, D315 (TLP621-1).
Q353 (2SC1740) & related components, T311, check
secondary side of T311, check entire power supply
section, check horizontal output section

Power Supply Output Voltage is Less or
Excess Than Normal

Switch off the TV immediately
Check AC mains supply, R302 (5.60/7w)
D303-D306 (TVR4N x 4), C307 (220MFd/400V),
Q313 (BU508AF), R325 (470/2W), C316 (1000pF)
R320-R321 (120K), R322 (15K), D314 (1S1553),
R324 (470/2W), R319 (2202), C314 (0.039MFd),
D317 (ES1), R326 (3K), Q312 (2SC3807), C317
(0.022MFd), C315 (0.012MFd), R315 (22K), D316
(1S1553), R317 (5602), Q311 (2SA1015), R311
(5K6), Opto-coupler D315 (TLP621-1), R355 (47K)
R356 (22K), R354 (150K), D361 (6.2V-zener), Q353
(2SC1740),
R353 (4K7), R352 (100K), VR351 (3K).
T311, check secondary side of T311

Colour Patches on the Screen
Strong magnetic field near CRT, PTC PS301,
degaussing coil L901, demagnetize the CRT with the
help of an external degaussing coil, CRT def. (rare)

8
Only +130V Supply is Missing From Power
Supply While Other Supplies Are OK

Winding of pin no. 13 of T311 is open or def., D351
(RU3AM), C361 (220MFd), +130V supply line short.

Only +180V Supply is Missing From Power
Supply While Other Supplies Are OK

Winding of pin no. 14 of T311 is open or def., D362
(EU1C). C362 (22MFd/250V), L455 (68μH). check
+180V supply line for short

Only +24V Supply is Missing From Power
Supply While Other Supplies Are OK

Winding of pin no. 15 of T311 is open or def., D35
(EU2Z, C363 (330MFd/35V), R359 (12), check
+24V supply line for short

Only +22V Supply is Missing From Power
Supply While Other Supplies Are OK

Winding of pin no. 17 of T311 is open or def., D355
(MR852RL). C365 (220OMFd/35V), R399 (1.8 Ω /5W)
check +22V supply line for short.

Only +12V Supply is Missing From Power
Supply While Other Supplies Are OK

Winding of pin no. 16 of T311 is open or def., D354
(RU3YX), C364 (2200MFd/25V), R369 (2.7 Ω /1W),
C351 (AN78M12), C290 (470MFd/16V), check +12V
supply line for short

Only +5V Supply is Missing From Power
Supply While Other Supplies Are OK

Power trafo. T380, D381 (EMO1Z), C381
(470MFd/25V), R381 (2K2). D382 (5.6V-zener),
0381 (2SC2568), C390 (470MFd/10v), check +5V
supply line for short.



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