Daewoo | GB21F1T2 | MODEL Chassis KEYWORD SYMPTOM CURE 2898ST No Txt

MODEL
Chassis
KEYWORD
SYMPTOM
CURE
2898ST
No Txt
Reprog EEPROM using service remote
Combi
Child lock removal
Press Bule­Yellow­Green­Red within 5­10 secs then press st/by twice
CP240 GB20F8T2
CP240
Dead or relay clicking only
C840 47µ 25v in psu pri
CP240 GB20F8T2
CP240
No control of vol or chan change ­ neg pic with fb lines
1703 eprom available from seme part number CAT24C08p at ?8
CP240
To set up & service mode…
Put set in standby then press blue yellow green red & standby to get into svc, to adjust use 4 & 7, vert centre 5 & 8 size 6 & 9 slope yellow, blue horiz centre 123 & above to ajust RGB
St/by only ­ relay clicks at sw on
Replace HT pot VR801 4k7, D807 BYV95C, Q801 2SD1555 & I801 chopper chip TDA4601 & check for dry joints
CP330
Jumps chans and sound varies
24C08P Eprom memory chip IV02 ­ use Daewoo type
CP330/CP365
Magenta cast after I501 replacement
I501 TDA4661 chroma delay line chip could be faulty
No pic or line drive
Check drive pin 37 I701 TDA8362B, if none check 8.2v pin 36, if present replace chip, if absent check R401/2, D401
CP330/CP365
Txt absent/garbled
XT01 27Mhz Xtal
CP340
Int sw off
TOP210PFI, I807 CP365
Int loss of signals ­ OSD ok
Dry joints chopper tfmr
CP365
Int signals
Dry joints sec of chopper tfmr
CP365
Sound ­ int crackle
Invisible dry joint C808 270pF 1Kv ­ pin 3 pri of chopper Tx
CP380
Blank raster, no sound, osg or r/c when first switched on (OK Earth speakers/grill to crt rimband
after re­switched on)
CP240 GB20F8T2
CP310
CP330/CP365
Int reverts to st/by
RLY2 relay was operating when fault occurred ­ IC I807 (TOP210­PF1) the standby switch mode IC in the power supply pic displaced to left
crack in pin 10 loptx ­ no fback pulse to line gen AFC loop
Dead ­ lop tr Q401 2SD1880 s/c
C416 blue disc cap 680pf 2kv s/c. D503 1N4148 s/c; RC527 10R chip res; R503 10k; R409 4k7 were cause of problem
Dead with psu running
No or low line drive at base Q402 line dr ­ check Trs Q405 2SA854 & Q406 2SC945 for leak
NICAM cracles
replaced SAWF for analogue type to prevent operation ­ bodge!
No signals ­ fault in tuner
. replace 4­legged device ( dual gate FET SMD transistor marked MOs ) inside the tuner near aerial input. I used generic BF998 marked Mop
Pic slow to come on ­ sound ok
Replace TDA8375A jungle chip
Service remote substitute
Can use universal from TopTel4 or Gumbody 4 code = 244 for serv rem R30SVC
CP775
Txt lines on bottom 1/3 pic with Sat & VCR
TDA8351 FOP chip
CP775
Various faults on chan change; eg E­W, blank raster, snow or data line down to 4V (must be 5V) ­ D708 5.6V zener is leaky Also replace st/by
D709 5.6V zener to be on the safe side.
DMQ1454P
Storing of tuning or analogue levels inop
D912, D903 leaky & check tactile switches for leakage
DMQ2057
Bright smeary pic
190v to RGB low ­ C426 3µ3 250v
CP420 GB14F7T1
CP760
CP775
CP775
CP775
CP775
CP775
CP775
DMQ2059
Int trip
On/Off sw momentary contacts perm connected
DMQ2072
No signals & no OSD
R256 18R o/c in st/by reg cct
DMQ2159 CP315
Excess brill with fb lines at sw on ­ ok when heated
C426 3µ3 250v in 190v supply
DMQ2166
HOW TO ENTER IN SERVICE MODE FOR TV Daewoo DMQ 2166?
you need a spesific remote from deawoo
DTE28G7GB CP785
No sound/pic ­ psu & line drive ok
TDA8385J FOP chip faulty
Dead
Check/replace C53 1µ 100v, D63 RD16F or MA7160 16v zener, C64 680µ 16v,
Dead
F4AH fuse o/c, chopper tr 2SD2499 s/c ­ used 2SD1555 in lieu, C811 100µ 16v hi esr, 220µ 25v hi esr
DVT1482P
Dead ­ mains fuse blackened & Chopper Tr s/c
TDA4601 control chip & C811 100µ 35v
DVT1482P
Dead with burning smell
LOPTx
DVT1482P CP310
Sound absent in TV mode ­ ok in pback
Check RHS edge connector for dry joints/damaged print on video unit
DVT2082P
Int dead
Dry joint C817 100µ ­ remove plastic strut to see
DVT2082P
Red missing
Q552 2SA1266 on crt base
DWX28W5GB
Impurity
check degaus coil not trapped by set back causing them to go o/c
GB14F7T1
Dead ­ psu ok but no lop
hairline crack by LOPTr coll tp LOPTx
GB14F7T1
Sound disappears int
(IC) I501 a TDA8374A mounted on the VCR pcb.
Won't sw on with tape stuck ­ st/by only
No volts at 6v reg IC1806 ­ P803 plug/skt has 8v in but no 8v o/p due to dry joint on/off sw
GB14F7T1 CP420
St/by only
R804 47k start up res
GB14F8T1
No Vol adj ­ osg stuck ? way
IC1703 24C08P eeprom ­ pre­prog by Daewoo from SEME @ ?18
GB14H1N
No tuning ­ supply & clk/data lines ok
Tuner faulty ­ replaced Type DT5­BF18D pt no 48597­19930
GB14H1N
Service mode entering
Press "Norm­av­sleep­clear­stby" on R/C
GB14H1N
Sound absent & snowy pic aft re­assemby
Check pl/skt conns of spk ­ can be accidentally put in set AGC skt
GB14H1N
Won't come out of st/by, sw off when playing, OSG corrugated ­ all int
I826 3.3v reg LE33CZ on front of pcb ­ available From Farnell
Service mode entering
On hset press Blue > Yellow > Green > Red > Stby sequencially. When brought out of st/by should be in service mode. Use buttons 1 & 4 for Slope Adjust; 2 & 5 for Vert Centre; Use buttons 3 & 6 for Vert Amp...
GB14H1T
Sync absent
eeprom ­ [clock & data lines on video ic were low by approx 1v]
GB20A5
No picture sound ok power supply working ok
IC1301 TDA8356 _ D301 5.1 Zener
GB21F1T2
Dead ­ 4A mains fuse blown
C842 4700pf blue bead cap burnt & short
Arcing in scan coil plug blew components
Field chip TDA8351, then bright blue raster ­ TDA6106Q B o/p chip on crt base
GB2898ST
Buzz on sound at low level
resolder fop chip heatsink
GB2898ST
No e/w correction
Q404, next to the E/W o/p tr 2SC3198 leaky
GB2898ST
no picture ­ sound, heaters, EHT were OK.
Decoupling cap C417 4n7 400v leaky
GB2898ST
Sound only ­ no line drive
R820 feed to 12v & 8v feed should be 2R ­ was 10R in this case
DVF522P
DVT1482P
GB14F7T1
GB14H1T
GB2898CTV
GB2898ST
St/by only
C815 1000µ 25v o/c
GB5582TX
Pick fades out maybe once a week
Dry joints LOPTx heater pin
N/K
Rainbow raster ­ sound ok
Field o/p chip faulty
T140
Dark pic ­ non existent until A1 turned up
C542 10n 3kv on crt base int
T200
St/by only ­ relay clicks ok
C410 1nf 2kv in lop stage smoking & faulty
T200
Trips 3 ­ 4 times then dead
C807 120µ 400v
T512
Poor greyscale tracking .
C504 sc
TVC14VP
Dead ­ led flashes red/green
R817 o/c
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