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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 4551
Philips
NC3
dead - 2A fuse o/c
4R7 dropper o/c, BUT11AF chopper tr s/c, dry joints chopper tfmr & others
14-09-04
Philips
NC3
Dead - blowing line output Tx BUT11AF Q501.
Dry joints on LOPTX especially pin 10.
14-09-04
Philips
NC3
Dead - blown chopper transistor.
R418 o/c.
14-09-04
Philips
NC3
Dead - chopper Q401 duff.
Check for drys at connections to chopper Tx T402.
14-09-04
Philips
NC3
Dead - went with bang
burnt print around on/off sw also blew Q400 BC337 s/c; D404, 411, 407, 410 1N4148 s/c
14-09-04
Philips
NC3
Dead chopper TR s/c R401 ( 4R7 ) o/c
Check for D/J around Chopper TX & LOPT
14-09-04
Philips
NC3
DEAD WHISTLES DISCONNECTING PIN 2 LOPT AND SET RUN
CHECK D2581 2582 8v2 ZENER OR THYRISTOR
14-09-04
Philips
NC3
Dead with whistle
OK on dummy load, Zener diodes 2581/2 8v2 leaky in crowbar trip cct
14-09-04
Philips
NC3
Field - lack of height
R581 3M9 hi res connected to 95v supply in TDA4505 cct
14-09-04
Philips
NC3
FIELD FOLDOVER
R556 HIGH ( 24k )
14-09-04
Philips
NC3
Goes into prot mode aft half an hour
100v HT had gone high - CNX62 opto coupler faulty
14-09-04
Philips
NC3
Horizontal lines & streaks
C2413 100µ 400v o/c
14-09-04
Philips
NC3
Int pic
R608 18R dry joint
14-09-04
Philips
NC3
Intermittent poor picture & garbled sound.
Channel change switch S300.
14-09-04
Philips
NC3
Monochrome pic with false line lock
Misshapen sandcastkle pulse caused by TDA4505 chip - also check 680k line pulse feed res
14-09-04
Philips
NC3
Motorboating sound with green raster
C2483 dry joints had damaged 5v reg 78M05
14-09-04
Philips
NC3
No col
Replace TDA3565 dec chip & adj R635 ref osc. To adj s/c pins 5 & 1 of chip
14-09-04
Philips
NC3
No colour
Try adjusting R635.
14-09-04
Philips
NC3
No colour - brightness/contrast inoperative.
IC TDA4505.
14-09-04
Philips
NC3
No pic - sound ok
No A1 volts - LOPTx faulty
14-09-04
Philips
NC3
No pic for first 2 hours
Replace TDA3565 dec chip & adj R635 ref osc. To adj s/c pins 5 & 1 of chip
14-09-04
Philips
NC3
No pic just blank raster - sound ok
Sandcastle pulse dist - break in print between R570 & SC gen o/p from IC pin27
14-09-04
Philips
NC3
No picture & garbled sound.
Channel change switch S300.
14-09-04
Philips
NC3
NO SOUND AND POOR CONTRAST
R416 10R OC
14-09-04
Philips
NC3
No tuning adjust - original settings ok
Bad contacts on chan switch
14-09-04
Philips
NC3
Poor contrast & no sound
R416 10R in 22v feed
14-09-04
Philips
NC3
RASTER BLANK OSD WORKS
TDA3565 US
14-09-04
Philips
NC3
Ringing pic, weak & buzzing sound
Check SAWF & ceramic filters in IF
14-09-04
Philips
NC3
Tuning indicator (green line) perm displayed
C371 100µ 16v s/c
14-09-04
Philips
NC3-CR
Horizontal striations over screen.
C2413 ( 100uf , 400v ) o/c.
14-09-04
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