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GRUNDIG Service
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
TVR 37…, TVR 51…, TVR 55…
Leistungs-Chassis / Power Chassis TVR 55… (GSPD)
0,1V
50
51
2,4V
1,3V
2,5V
2,5V
0,5V
2,6V
2,6V
0,3V
2,5V
14,5V
13,5V
3V
2,7V
315V
290V
BECAUSE A HOT GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT, AN ISOLATION
TRANSFORMER MUST BE USED. ALSO, IN ORDER TO HAVE THE ABILITY TO INCREASE
THE INPUT VOLTAGE SLOWLY, WHEN TROUBLESHOOTING THIS TYPE OF POWER SUPPLY
CIRCUIT, A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.
HOT GND
COLD GND
Degaussing Coil
HOT PART
Ubat
0,1V
3331 G
3330 H 4
3328 I 2
3327 J 2
3324 K 2
3322 L 3
3313 D12
3312 D11
3310 B 9
3304 C 6
2594 F21
2593 D26
2592 I33
2589 C27
2587 E24
2586 F25
2583 H22
2582 M32
2581 H21
2575 F26
2574 E25
2555 N28
2553 M30
2552 G22
2551 K30
2520 N26
2519 O25
2517 N20
2516 M24
2515 N19
2514 L20
2513 M22
2512 K27
2392 I14
2381 H14
2379 J14
2378 L14
2377 I13
2375 M14
2374 H14
2373 G15
2371 G14
2362 F14
2353 J18
2352 L15
2351 K14
2341 L 4
2338 M 9
2337 L 9
2336 J10
2335 L10
2332 G10
2331 F10
2330 I 8
2329 H 2
2328 H10
2327 I 2
2325 J 2
2324 K 2
2323 K 2
2320 L 5
2316 D 7
2315 F 8
2314 D10
2312 C12
2309 H 8
2308 H 7
2305 E11
1926 J33
1925 C19
1924 C10
1923 M33
1922 P20
1921 C15
1572 J31
1371 H13
1311 E 5
1300 C 7
1013 E 2
1013 D 2
4
5
6
1
7
8
9
10
11
2
3
O
N
M
L
K
J
I
H
G
F
E
D
C
Q
B
P
4
5
6
1
7
8
9
10
11
2
3
220n
2316
2309
4n7
2308
1n
220p
2336
4n7
2330
470p
2332
2331
10n
1n
2324
2329
330p
470p
2327
2341
2n2
1n
2314
1n
2305
470p
2328
4n7
2338
100n
2337
2323
4n7
1n
2312
2325
560p
24k
3345
5k6
3363
20k
3362
33
3M
270k
3331
330E
3359
180k
3348
10k
3342
33k
3328
0E82
3335
1k
3339
5k1
3327
10k
3330
100k
3324
18k
3322
3304
270E
9k1
3356
20k
3357
0E82
3334
3337
2E
68E
3333
3312
3M9
75E
3347
BAT85
6348
BYD33J
6332
BAV21
6334
BAV21
6335
1N4006GP
6315
1N4006GP
6313
1N4006GP
6314
1N4006GP
6316
BYD33D
6336
9309
9303
9310
9311
9308
1311
T4AH
2u2
2320
68u
2315
100u
2335
5312
UF2327
3310
1
2
3
1924
1
2
39E
3338
5E6
3341
5350
80E
5354
80E
5330
1
3
4
5
6
7
2
8
STP4NA60FI
7330
1300
1013
1013
4k7
3358
7310
MC44603P
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
(REDUCED FREQUENCY)
AMP
ERROR
FOLDBACK
MANAGEMENT
OSCILLATOR
Iref
DEMAGNETICATION
Vdem out
STANDBY
2.5V
P
F
T
FOLDBACK INPUT
E/A OUT
R standby
Sync
R standby
VOLTAGE
C
FEEDBACK
Vdem in
CURRENT SENSE INPUT
Vosc
REFERENCE
Vref
BLOCK
Iref
enable
Vref
CURRENT
SENSE
Vosc prot
Iref
Dmax & SOFT-START
INITIALIZATION BLOCK
Set
Latch
Reset
SHUTDOWN
THERMAL
CONTROL
SUPPLY &
Q
Rref
Soft Start & Dmax
Iref
Vovp out
Vref
BUFFER
OVERVOLTAGE
MANAGEMENT
UVLO1
Vref
OVERVOLTAGE
PROTECTION
UVLO1
Vcc
Vcc
OUTPUT
GND
18V
Vc
CAUTION : LETHAL POTENTIALS AT PRIMARY
DO NOT OPERATE WITHOUT CASE
ISOLATION TRANSFORMER WHEN SERVICING
HOT CIRCUIT , BE CAREFUL AND USE AN
SWITCH PCB
1301
IN
OUT
1013
1013
1003
1
2
3
4
2
1
3302
4M7
52