Schematics 4 Free
Service manuals, schematics, documentation, programs, electronics, hobby ....
◦
register
◦
send pass
S
earch
B
rowse
U
pload
W
anted
D
atasheets
C
hassis2model
R
epair tips
F
ulltext search
C
ables & Connectors
R
epair tips
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: 1049
Panasonic
TXW28R4
St/by only LOPTr s/c (BU2508AXLB)
Replaced by 2SD1577LB for greater reliability
14-09-04
Panasonic
TXW28R4
Trips to st/by int
C464 220nF had a 22nF cap fitted in error
14-09-04
Panasonic
TXW28R4DP
Sw off aft 15 secs - sound & pic ok
R558 120k by LOPTx fback from beam lim to prot cct
14-09-04
Panasonic
TXW28R4DP Euro4
Blnk raster - no OSD
Microprocessor IC1101 part number SDA5450C48 (30 UKP +VAT).
14-09-04
Panasonic
TXW28R4DP Euro4
No sigs - snow only on screen
leaky SMD transistor marked "BR" inside IF section of the tuner. I used MSB1218ART1
14-09-04
Panasonic
TXW28R4DP Euro4
Sound dist from lh speaker
sound processor IC2102 MSP3410D part number MSP3410DPOB4
14-09-04
Panasonic
U1
Dead
Q801 BU326 chopper tr faulty - checked ok on meter
14-09-04
Panasonic
U1
Int field collapse
Dry joints Trs 454 & 455
14-09-04
Panasonic
U1
No colour - intermittent.
Intermittent customer colour control.
14-09-04
Panasonic
U1
No raster - EHT ok.
D818.
14-09-04
Panasonic
U1
Sound - no sound or raster.
R810.
14-09-04
Panasonic
U2
Field collapse
Q403 (Darlington tr) 2SD837 - BD645 works
14-09-04
Panasonic
U2
Frame - top foldover if adj A1 control.
Frame IC TDA1106.
14-09-04
Panasonic
U2
Lines/interference on pic
C854 o/c
14-09-04
Panasonic
U2
No brightness.
BU208.
14-09-04
Panasonic
U2
No picture - CRT cut off.
2x zeners 6.2v in regulator base cct.
14-09-04
Panasonic
U2
Sound - level affected by contrast control.
C857 ( 47u f )
14-09-04
Panasonic
U2
Sqealing/line tearing/corrugated verts
C809 1µ 250v
14-09-04
Panasonic
U2
Standby - stuck in standby.
PSU D852/3 , Q501 line drive transistor , LOPTX.
14-09-04
Panasonic
U2
Standby - stuck in standby.
D552 ( TVSC2715M ) o/c.
14-09-04
Panasonic
U2
Stuck in standby.
D852 or D853 ( BY298 ) leaky , BU208.
14-09-04
Panasonic
U2
Width & Hight reduced.
C371 ( 100uf 240v ) in middle of board.
14-09-04
Panasonic
U3
Comes on in standby if on/off switch is used.
Relay RY1001 carbonised contacts.
14-09-04
Panasonic
U3
Field - 1/2 pic
Q402 2SD856 - used TIP41C
14-09-04
Panasonic
U3
Field collapse
Replaced field o/p trs but ran hot - D407 1N4148 o/c
14-09-04
Panasonic
U3
Trips to st/by aft 1 sec
HT smoother C808 220µ 400v
14-09-04
Panasonic
U3
Whistles/Screeches at sw on with black lines
C809 1µ 350v, C853 100µ 250v
14-09-04
Panasonic
U3
whistling & ringing verts
C853 100µ 250v
14-09-04
Panasonic
U3W
Channels - difficulty selecting channels.
IC TMS3452N2L.
14-09-04
Panasonic
U3W
Channels - not storing channels.
IC TMS3452N2L.
14-09-04
page:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
FB
-
Links
-
Info / Contacts
-
Forum
-
Last SM download : Peavey Mark VIII
script execution: 0.12 s