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: 14
Protech
Faint pic
C604 47n 63v s/c
14-09-04
Protech
11AK20D1
Dead - pri HT only
R804 15k 1w, IC801 TDA4505-2 replaced left psu tripping - D809 MR856 s/c - used BYW96E in lieu
14-09-04
Protech
3731T 11AK20M-3
LOPTx arcing
Use ALB587 from CHS (same as Bush 1433)
14-09-04
Protech
3743T
Dead
R804 820k in psu o/c
14-09-04
Protech
3743T
Reluctant cold start
Reduce R802 from 75k to 30k 2w
14-09-04
Protech
5131NT Vestel
No pic - sound ok
Poor washed out pic appeared when A1s advanced - TDA6107Q RGB O/P chip on CRT base
14-09-04
Protech
6392 11AK12-9
Field collapse
R818 22K o/c
14-09-04
Protech
7206NT 11AK19-8A
E-W faulty - narrow, bowed pic
Dry jointed & o/c C630 430nF, when replaced took the FOP chip out. R629 2R7 safety res o/c, replaced TDA8351 FOP chip & L604 shorted turns (read 0R9 - should be approx 2R7) rewound with 393 turns - see also Bush 2871NTX
14-09-04
Protech
7295
Field collapse
No volts pin 33 TDA8362A (field ramp) - R810 22k o/c
14-09-04
Protech
7295
No sound
TDA1521A Audio o/p chip u/s due to C380 1000µ 35v s/c
14-09-04
Protech
7295
Tuning drift
Tuning volts varies due to C504 0µ1 leaky
14-09-04
Protech
7295 11AK12
Field collapse
R818 22k 1w in 33v line o/c
14-09-04
Protech
7296NT
Field collapse
TDA8361A jungle chip - no field drive o/p although most dc volts were about right
14-09-04
Protech
PFA3639/B 11AK20
Dead
D809 sec chopper trfmr s/c - needs r/c to sw on set
14-09-04
page:
1
FB
-
Links
-
Info / Contacts
-
Forum
-
Last SM download : shenzhen ast-2008-g
script execution: 0.00 s